Add governed DHMV terrain analysis

.env.example

@@ -12,6 +12,14 @@ ORTHOPHOTO_RESOLUTION_M=1.0
 ORTHOPHOTO_MIN_SIDE_M=128
 ORTHOPHOTO_MAX_SIDE_M=1024
 ORTHOPHOTO_CACHE_TTL_HOURS=24
+DHMV_ENABLED=true
+DHMV_WCS_URL=https://geo.api.vlaanderen.be/DHMV/wcs
+DHMV_RESOLUTION_M=5.0
+DHMV_MIN_SIDE_M=10
+DHMV_MAX_SIDE_M=20000
+DHMV_MAX_PIXELS=12000000
+DHMV_TIMEOUT_SECONDS=300
+DHMV_MAX_RESPONSE_MB=160
 YOLO_ENABLED=false
 YOLO_MODELS_DIR=/app/models
 YOLO_MODEL_PATH=

CHANGELOG.md

@@ -7,6 +7,22 @@
 
 # Changelog
 
+## Sprint 207 Governed DHMV II terrain foundation (2026-07-15)
+
+- Added a fixed official Digitaal Vlaanderen DHMV II DTM/DSM WCS registry,
+  bounded multipart GeoTIFF acquisition and exact persisted-Area clipping.
+- Validates and retains native 1 m product identity, 5 m analysis resolution,
+  EPSG:31370, Float32 nodata, TAW, acquisition period and source/output
+  checksums through ordinary Dataset, DatasetVersion and Job persistence.
+- Added exact raster-selection metrics for mean/min/max/P10/P90 height, relief
+  and slope, with explicit valid-cell coverage and computation methods.
+- Added a Mol operator and a `Hoogte & reliëf` map theme with colour-relief
+  MapLibre overlay over the existing OpenStreetMap context.
+- Explicitly keeps drainage as a future derived analysis and prohibits
+  presenting DHMV terrain/surface height as water depth or volume.
+- Added runtime/Unraid configuration and focused acquisition, GIS formula,
+  persistence, API, frontend and packaging tests without a migration.
+
 ## Sprint 206 Governed Buildings and Addresses Register snapshot (2026-07-15)
 
 - Added an explicit operator for the current official Digitaal Vlaanderen

backend/README.md

@@ -1184,6 +1184,32 @@ Settings: `ORTHOPHOTO_ENABLED`, `ORTHOPHOTO_WMS_URL`,
 `ORTHOPHOTO_CACHE_TTL_HOURS`. Keep the official HTTPS URL and 1 m profile
 unless a separately verified deployment/model profile requires a change.
 
+## Governed DHMV terrain acquisition
+
+`GET /api/v1/projects/{project_id}/datasets/dhmv/products` exposes the fixed
+official DTM/DSM registry. `POST .../datasets/dhmv/acquire` requests only
+`DHMVII_DTM_1m` or `DHMVII_DSM_1m` from the production Digitaal Vlaanderen WCS.
+The default 5 m analysis copy keeps complete-Mol processing bounded while
+retaining native 1 m resolution, EPSG:31370, TAW, `-9999` nodata and the
+2013-2015 acquisition period in provenance.
+
+Run the complete Mol operator after the regional workspace and Mol Area exist:
+
+```bash
+docker exec geointel python /app/scripts/provision_mol_dhmv.py
+```
+
+The operator acquires DTM and DSM, clips each raster to the exact persisted
+Area, validates checksums and calls the terrain selection endpoint as a smoke.
+Use `--products dtm_1m`, `--resolution-m 5` or `--force` when explicitly
+needed. `POST .../raster/terrain/select` returns height in m TAW, relief in
+metres and slope in degrees. `GET .../raster/terrain/image` returns the
+constrained MapLibre PNG. Water depth, volume and drainage remain unavailable.
+
+Settings: `DHMV_ENABLED`, `DHMV_WCS_URL`, `DHMV_RESOLUTION_M`,
+`DHMV_MIN_SIDE_M`, `DHMV_MAX_SIDE_M`, `DHMV_MAX_PIXELS`,
+`DHMV_TIMEOUT_SECONDS` and `DHMV_MAX_RESPONSE_MB`.
+
 ## Waterinfo station histories
 
 Run the explicit operator after the regional workspace and Mol Area exist:

backend/app/api/routes/datasets.py

@@ -22,6 +22,8 @@ from app.schemas import (
     RasterNdwiRequest,
     RasterNdbiRequest,
     OrthophotoAcquireRequest,
+    DhmvAcquireRequest,
+    TerrainSelectionRequest,
     VectorBBoxResponse,
     VectorBufferRequest,
     VectorClipRequest,
@@ -40,6 +42,8 @@ from app.services.vector_operations_service import VectorOperationsService
 from app.services.vector_feature_service import VectorFeatureService
 from app.services.dataset_service import DatasetService
 from app.services.orthophoto_acquisition_service import OrthophotoAcquisitionService
+from app.services.dhmv_acquisition_service import DhmvAcquisitionService
+from app.services.terrain_analysis_service import TerrainAnalysisService
 from app.utils.response import envelope
 
 router = APIRouter(prefix="/projects/{project_id}", tags=["datasets"])
@@ -151,6 +155,30 @@ def list_orthophoto_products(project_id: UUID, db: Session = Depends(get_db)):
     return envelope({"items": items, "total": len(items)})
 
 
+@router.post("/datasets/dhmv/acquire", response_model=dict)
+def acquire_bounded_dhmv(
+    project_id: UUID,
+    payload: DhmvAcquireRequest,
+    db: Session = Depends(get_db),
+):
+    job = JobService.run_sync_job(
+        db=db,
+        project_id=project_id,
+        job_type="raster.dhmv.acquire",
+        parameters=payload.model_dump(mode="json"),
+        operation=lambda: DhmvAcquisitionService.acquire(db, project_id, payload),
+    )
+    return envelope(job)
+
+
+@router.get("/datasets/dhmv/products", response_model=dict)
+def list_dhmv_products(project_id: UUID, db: Session = Depends(get_db)):
+    if not db.get(Project, project_id):
+        raise AppError(code="PROJECT_NOT_FOUND", message="Project not found", status_code=404)
+    items = DhmvAcquisitionService.list_products()
+    return envelope({"items": items, "total": len(items)})
+
+
 @router.get("/datasets", response_model=dict)
 def list_datasets(
     project_id: UUID,
@@ -448,6 +476,30 @@ def raster_orthophoto_image(
     )
 
 
+@router.post("/datasets/{dataset_id}/raster/terrain/select", response_model=dict)
+def raster_terrain_selection(
+    project_id: UUID,
+    dataset_id: UUID,
+    payload: TerrainSelectionRequest,
+    db: Session = Depends(get_db),
+):
+    return envelope(TerrainAnalysisService.analyze(db, project_id, dataset_id, payload))
+
+
+@router.get("/datasets/{dataset_id}/raster/terrain/image")
+def raster_terrain_image(
+    project_id: UUID,
+    dataset_id: UUID,
+    db: Session = Depends(get_db),
+):
+    content = TerrainAnalysisService.render_png(db, project_id, dataset_id)
+    return Response(
+        content=content,
+        media_type="image/png",
+        headers={"Cache-Control": "private, max-age=86400"},
+    )
+
+
 @router.get("/datasets/{dataset_id}/raster/stats", response_model=dict)
 def raster_stats(
     project_id: UUID,

backend/app/core/config.py

@@ -31,6 +31,17 @@ class Settings(BaseSettings):
     orthophoto_timeout_seconds: int = Field(default=120, ge=1, validation_alias="ORTHOPHOTO_TIMEOUT_SECONDS")
     orthophoto_max_response_mb: int = Field(default=32, ge=1, validation_alias="ORTHOPHOTO_MAX_RESPONSE_MB")
     orthophoto_cache_ttl_hours: int = Field(default=24, ge=0, validation_alias="ORTHOPHOTO_CACHE_TTL_HOURS")
+    dhmv_enabled: bool = Field(default=True, validation_alias="DHMV_ENABLED")
+    dhmv_wcs_url: str = Field(
+        default="https://geo.api.vlaanderen.be/DHMV/wcs",
+        validation_alias="DHMV_WCS_URL",
+    )
+    dhmv_resolution_m: float = Field(default=5.0, ge=1.0, le=10.0, validation_alias="DHMV_RESOLUTION_M")
+    dhmv_min_side_m: float = Field(default=10.0, gt=0, validation_alias="DHMV_MIN_SIDE_M")
+    dhmv_max_side_m: float = Field(default=20_000.0, gt=0, validation_alias="DHMV_MAX_SIDE_M")
+    dhmv_max_pixels: int = Field(default=12_000_000, ge=1, validation_alias="DHMV_MAX_PIXELS")
+    dhmv_timeout_seconds: int = Field(default=300, ge=1, validation_alias="DHMV_TIMEOUT_SECONDS")
+    dhmv_max_response_mb: int = Field(default=160, ge=1, validation_alias="DHMV_MAX_RESPONSE_MB")
     redis_url: str | None = Field(default=None, validation_alias="REDIS_URL")
     log_level: str = Field(default="INFO", validation_alias="GEOINTEL_LOG_LEVEL")
     database_statement_timeout_ms: int = Field(default=5_000, validation_alias="DATABASE_STATEMENT_TIMEOUT_MS")

backend/app/schemas/__init__.py

@@ -33,6 +33,15 @@ from .segmentation import (
 from .health import HealthResponse, SystemCapabilities
 from .job import JobCreate, JobList, JobRead, JobStatus
 from .orthophoto import OrthophotoAcquireRequest, OrthophotoAcquisitionResult, OrthophotoProductRead
+from .dhmv import (
+    DhmvAcquireRequest,
+    DhmvAcquisitionResult,
+    DhmvProductRead,
+    TerrainMetric,
+    TerrainSelectionRequest,
+    TerrainSelectionResponse,
+    TerrainSelectionSummary,
+)
 from .external import (
     ExternalFetchRequest,
     ExternalFetchResponse,
@@ -135,6 +144,13 @@ __all__ = [
     "OrthophotoAcquireRequest",
     "OrthophotoAcquisitionResult",
     "OrthophotoProductRead",
+    "DhmvAcquireRequest",
+    "DhmvAcquisitionResult",
+    "DhmvProductRead",
+    "TerrainMetric",
+    "TerrainSelectionRequest",
+    "TerrainSelectionResponse",
+    "TerrainSelectionSummary",
     "VectorBBoxResponse",
     "VectorClipRequest",
     "VectorBufferRequest",

backend/app/schemas/dhmv.py

@@ -0,0 +1,91 @@
+from __future__ import annotations
+
+from uuid import UUID
+
+from pydantic import BaseModel, Field
+
+from .operations import VectorSelectionBBox
+
+
+class DhmvAcquireRequest(BaseModel):
+    bbox: VectorSelectionBBox
+    area_id: UUID | None = None
+    product_key: str = "dtm_1m"
+    resolution_m: float | None = Field(default=None, ge=1.0, le=10.0)
+    force_refresh: bool = False
+
+
+class DhmvProductRead(BaseModel):
+    key: str
+    display_name: str
+    surface_model: str
+    coverage_id: str
+    native_resolution_m: float
+    source_crs: str
+    vertical_reference: str
+    acquisition_period: str
+    catalog_url: str
+    attribution: str
+    limitation_message: str
+
+
+class DhmvAcquisitionResult(BaseModel):
+    output_dataset_id: UUID
+    reused: bool
+    provider: str
+    product_key: str
+    display_name: str
+    surface_model: str
+    coverage_id: str
+    native_resolution_m: float
+    resolution_m: float
+    width: int
+    height: int
+    valid_pixel_count: int
+    nodata_value: float
+    bbox_epsg4326: list[float]
+    bbox_epsg31370: list[float]
+    vertical_reference: str
+    acquisition_period: str
+    attribution: str
+    limitation_message: str
+
+
+class TerrainSelectionRequest(BaseModel):
+    bbox: VectorSelectionBBox
+    area_id: UUID | None = None
+
+
+class TerrainMetric(BaseModel):
+    metric_key: str
+    metric_label: str
+    metric_value: float
+    metric_unit: str
+    aggregation_method: str
+    derived: bool = True
+
+
+class TerrainSelectionSummary(BaseModel):
+    metric_label: str
+    metric_value: float
+    metric_unit: str
+    aggregation_method: str
+    primary_metric_key: str
+    metrics: list[TerrainMetric]
+
+
+class TerrainSelectionResponse(BaseModel):
+    dataset_id: UUID
+    product_key: str
+    surface_model: str
+    selection_bbox: VectorSelectionBBox
+    selection_area_id: UUID | None = None
+    sample_count: int
+    slope_sample_count: int
+    coverage_ratio: float
+    resolution_m: float
+    vertical_reference: str
+    summary: TerrainSelectionSummary
+    unsupported_metrics: list[str]
+    limitation_message: str
+    generated_at: str

backend/app/services/dhmv_acquisition_service.py

@@ -0,0 +1,501 @@
+from __future__ import annotations
+
+import hashlib
+import json
+import math
+from dataclasses import dataclass
+from datetime import UTC, datetime
+from email.parser import BytesParser
+from email.policy import default
+from pathlib import Path
+from typing import Any, Callable
+from urllib.error import HTTPError, URLError
+from urllib.parse import urlencode
+from urllib.request import Request, urlopen
+from uuid import UUID
+
+from geoalchemy2.shape import to_shape
+from pyproj import Transformer
+from shapely.geometry import box, mapping
+from shapely.ops import transform as shapely_transform
+
+from app.core.config import Settings, get_settings
+from app.core.errors import AppError
+from app.models import Area, Dataset, Project
+from app.schemas.dhmv import DhmvAcquireRequest, DhmvAcquisitionResult, DhmvProductRead
+from app.services.dataset_service import DatasetService
+
+
+@dataclass(frozen=True)
+class DhmvProduct:
+    key: str
+    display_name: str
+    surface_model: str
+    coverage_id: str
+    native_resolution_m: float
+    catalog_url: str
+    limitation_message: str
+
+
+class DhmvAcquisitionService:
+    PROVIDER = "digitaal_vlaanderen_dhmv"
+    SOURCE_CRS = "EPSG:31370"
+    VERTICAL_REFERENCE = "TAW (Tweede Algemene Waterpassing)"
+    ACQUISITION_PERIOD = "2013-2015"
+    SOURCE_VERSION = "DHMV II 2014.01"
+    NODATA = -9999.0
+    ATTRIBUTION = "Bron: Digitaal Vlaanderen, Digitaal Hoogtemodel Vlaanderen II"
+    LICENSE_NOTE = "Gebruik volgens het gebruiksrecht geografische webdiensten van Digitaal Vlaanderen."
+    DTM_CATALOG_URL = (
+        "https://www.vlaanderen.be/datavindplaats/catalogus/"
+        "digitaal-hoogtemodel-vlaanderen-ii-dtm-raster-1-m"
+    )
+    DSM_CATALOG_URL = (
+        "https://www.vlaanderen.be/datavindplaats/catalogus/"
+        "digitaal-hoogtemodel-vlaanderen-ii-dsm-raster-1-m"
+    )
+
+    @staticmethod
+    def _products() -> dict[str, DhmvProduct]:
+        products = (
+            DhmvProduct(
+                key="dtm_1m",
+                display_name="DHMV II terreinmodel (DTM)",
+                surface_model="terrain",
+                coverage_id="DHMVII_DTM_1m",
+                native_resolution_m=1.0,
+                catalog_url=DhmvAcquisitionService.DTM_CATALOG_URL,
+                limitation_message=(
+                    "Maaiveldhoogte uit de opnameperiode 2013-2015. Gebouwen en andere objecten zijn verwijderd. "
+                    "Afstroming is een afgeleide interpretatie; dit product bevat geen waterdiepte."
+                ),
+            ),
+            DhmvProduct(
+                key="dsm_1m",
+                display_name="DHMV II oppervlaktemodel (DSM)",
+                surface_model="surface",
+                coverage_id="DHMVII_DSM_1m",
+                native_resolution_m=1.0,
+                catalog_url=DhmvAcquisitionService.DSM_CATALOG_URL,
+                limitation_message=(
+                    "Oppervlaktehoogte uit de opnameperiode 2013-2015, inclusief gebouwen en vegetatie. "
+                    "Dit is geen maaiveldmodel, waterdiepte of rechtstreeks gebouwhoogteproduct."
+                ),
+            ),
+        )
+        return {product.key: product for product in products}
+
+    @staticmethod
+    def list_products() -> list[dict[str, Any]]:
+        return [
+            DhmvProductRead(
+                key=product.key,
+                display_name=product.display_name,
+                surface_model=product.surface_model,
+                coverage_id=product.coverage_id,
+                native_resolution_m=product.native_resolution_m,
+                source_crs=DhmvAcquisitionService.SOURCE_CRS,
+                vertical_reference=DhmvAcquisitionService.VERTICAL_REFERENCE,
+                acquisition_period=DhmvAcquisitionService.ACQUISITION_PERIOD,
+                catalog_url=product.catalog_url,
+                attribution=DhmvAcquisitionService.ATTRIBUTION,
+                limitation_message=product.limitation_message,
+            ).model_dump()
+            for product in DhmvAcquisitionService._products().values()
+        ]
+
+    @staticmethod
+    def _product(product_key: str) -> DhmvProduct:
+        product = DhmvAcquisitionService._products().get(product_key.strip().lower())
+        if product is None:
+            raise AppError(
+                code="DHMV_PRODUCT_NOT_SUPPORTED",
+                message="Select DTM or DSM from the governed DHMV II product registry",
+                details={"product_key": product_key},
+                status_code=422,
+            )
+        return product
+
+    @staticmethod
+    def _prepared_request(payload: DhmvAcquireRequest, settings: Settings) -> dict[str, Any]:
+        if not settings.dhmv_enabled:
+            raise AppError(code="DHMV_NOT_CONFIGURED", message="DHMV acquisition is disabled", status_code=503)
+        product = DhmvAcquisitionService._product(payload.product_key)
+        resolution_m = float(payload.resolution_m or settings.dhmv_resolution_m)
+        if resolution_m < product.native_resolution_m or resolution_m > 10.0:
+            raise AppError(
+                code="DHMV_RESOLUTION_NOT_SUPPORTED",
+                message="DHMV analysis resolution must be between the native 1 metre and 10 metres",
+                status_code=422,
+            )
+        values = (payload.bbox.min_x, payload.bbox.min_y, payload.bbox.max_x, payload.bbox.max_y)
+        if not all(math.isfinite(value) for value in values) or payload.bbox.min_x >= payload.bbox.max_x or payload.bbox.min_y >= payload.bbox.max_y:
+            raise AppError(code="INVALID_BBOX", message="DHMV selection must be a finite non-empty rectangle", status_code=400)
+
+        transformer = Transformer.from_crs("EPSG:4326", DhmvAcquisitionService.SOURCE_CRS, always_xy=True)
+        lambert_bounds = transformer.transform_bounds(*values, densify_pts=21)
+        width_m = float(lambert_bounds[2] - lambert_bounds[0])
+        height_m = float(lambert_bounds[3] - lambert_bounds[1])
+        if width_m < settings.dhmv_min_side_m or height_m < settings.dhmv_min_side_m:
+            raise AppError(
+                code="DHMV_SELECTION_TOO_SMALL",
+                message=f"Select an area of at least {settings.dhmv_min_side_m:g} by {settings.dhmv_min_side_m:g} metres",
+                status_code=422,
+            )
+        if width_m > settings.dhmv_max_side_m or height_m > settings.dhmv_max_side_m:
+            raise AppError(
+                code="DHMV_SELECTION_TOO_LARGE",
+                message=f"Select an area no larger than {settings.dhmv_max_side_m:g} by {settings.dhmv_max_side_m:g} metres",
+                details={"width_m": width_m, "height_m": height_m},
+                status_code=422,
+            )
+        width = max(1, math.ceil(width_m / resolution_m))
+        height = max(1, math.ceil(height_m / resolution_m))
+        if width * height > settings.dhmv_max_pixels:
+            raise AppError(
+                code="DHMV_SELECTION_TOO_LARGE",
+                message="DHMV selection exceeds the configured raster cell limit",
+                details={"pixel_count": width * height, "max_pixels": settings.dhmv_max_pixels},
+                status_code=422,
+            )
+
+        bbox_4326 = [float(value) for value in values]
+        bbox_31370 = [float(value) for value in lambert_bounds]
+        request_identity = {
+            "provider": DhmvAcquisitionService.PROVIDER,
+            "coverage_id": product.coverage_id,
+            "bbox_epsg4326": [round(value, 8) for value in bbox_4326],
+            "bbox_epsg31370": [round(value, 3) for value in bbox_31370],
+            "resolution_m": resolution_m,
+            "area_id": str(payload.area_id) if payload.area_id else None,
+        }
+        request_hash = hashlib.sha256(json.dumps(request_identity, sort_keys=True).encode()).hexdigest()
+        params = {
+            "SERVICE": "WCS",
+            "VERSION": "2.0.1",
+            "REQUEST": "GetCoverage",
+            "COVERAGEID": product.coverage_id,
+            "FORMAT": "image/tiff",
+            "SUBSET": [
+                f"x({bbox_31370[0]:.3f},{bbox_31370[2]:.3f})",
+                f"y({bbox_31370[1]:.3f},{bbox_31370[3]:.3f})",
+            ],
+            "SCALEFACTOR": f"{resolution_m / product.native_resolution_m:g}",
+        }
+        query = [
+            ("SERVICE", params["SERVICE"]),
+            ("VERSION", params["VERSION"]),
+            ("REQUEST", params["REQUEST"]),
+            ("COVERAGEID", params["COVERAGEID"]),
+            ("FORMAT", params["FORMAT"]),
+            ("SUBSET", params["SUBSET"][0]),
+            ("SUBSET", params["SUBSET"][1]),
+            ("SCALEFACTOR", params["SCALEFACTOR"]),
+        ]
+        return {
+            **request_identity,
+            "product": product,
+            "request_hash": request_hash,
+            "request_url": f"{settings.dhmv_wcs_url}?{urlencode(query)}",
+            "params": params,
+            "bbox_epsg4326": bbox_4326,
+            "bbox_epsg31370": bbox_31370,
+            "width": width,
+            "height": height,
+        }
+
+    @staticmethod
+    def _scope_geometry(db, project_id: UUID, area_id: UUID | None, bbox_epsg4326: list[float]):
+        if not db.get(Project, project_id):
+            raise AppError(code="PROJECT_NOT_FOUND", message="Project not found", status_code=404)
+        selection = box(*bbox_epsg4326)
+        if area_id is None:
+            return selection
+        area = db.get(Area, area_id)
+        if not area:
+            raise AppError(code="AREA_NOT_FOUND", message="Area not found", status_code=404)
+        if area.project_id != project_id:
+            raise AppError(code="INVALID_DATASET_SCOPE", message="Area does not belong to this project", status_code=400)
+        intersection = to_shape(area.geometry).intersection(selection)
+        if intersection.is_empty or intersection.area <= 0:
+            raise AppError(
+                code="DHMV_SELECTION_OUTSIDE_AREA",
+                message="The DHMV selection does not overlap the selected work area",
+                status_code=422,
+            )
+        return intersection
+
+    @staticmethod
+    def _cached_dataset(db, project_id: UUID, filename: str) -> Dataset | None:
+        candidate = (
+            db.query(Dataset)
+            .filter(
+                Dataset.project_id == project_id,
+                Dataset.name == filename,
+                Dataset.source_name == DhmvAcquisitionService.PROVIDER,
+                Dataset.status == "ready",
+            )
+            .order_by(Dataset.imported_at.desc())
+            .first()
+        )
+        if candidate and candidate.storage_path and Path(candidate.storage_path).is_file():
+            return candidate
+        return None
+
+    @staticmethod
+    def _fetch(request_url: str, settings: Settings, opener: Callable[..., Any] | None = None) -> tuple[bytes, str]:
+        request = Request(request_url, headers={"User-Agent": "GeoIntel/0.1 bounded-dhmv-acquisition"})
+        max_bytes = settings.dhmv_max_response_mb * 1024 * 1024
+        try:
+            with (opener or urlopen)(request, timeout=settings.dhmv_timeout_seconds) as response:
+                content_type = str(response.headers.get("Content-Type", ""))
+                content_length = response.headers.get("Content-Length")
+                if content_length and int(content_length) > max_bytes:
+                    raise AppError(code="DHMV_RESPONSE_TOO_LARGE", message="Official DHMV response exceeds the configured size limit", status_code=502)
+                content = response.read(max_bytes + 1)
+        except AppError:
+            raise
+        except (HTTPError, URLError, TimeoutError, OSError) as exc:
+            raise AppError(
+                code="DHMV_PROVIDER_UNAVAILABLE",
+                message="The official DHMV WCS could not complete the bounded request",
+                details={"reason": str(exc)},
+                status_code=502,
+            ) from exc
+        if len(content) > max_bytes:
+            raise AppError(code="DHMV_RESPONSE_TOO_LARGE", message="Official DHMV response exceeds the configured size limit", status_code=502)
+        return content, content_type
+
+    @staticmethod
+    def _extract_geotiff(content: bytes, content_type: str) -> bytes:
+        if content.startswith((b"II*\x00", b"MM\x00*")):
+            return content
+        if "multipart" not in content_type.lower():
+            preview = content[:300].decode("utf-8", errors="replace")
+            raise AppError(
+                code="DHMV_PROVIDER_INVALID_RESPONSE",
+                message="The official DHMV service did not return a GeoTIFF coverage",
+                details={"content_type": content_type, "response_preview": preview},
+                status_code=502,
+            )
+        message = BytesParser(policy=default).parsebytes(
+            f"Content-Type: {content_type}\r\nMIME-Version: 1.0\r\n\r\n".encode() + content
+        )
+        for part in message.iter_parts():
+            payload = part.get_payload(decode=True) or b""
+            if part.get_content_type() == "image/tiff" and payload.startswith((b"II*\x00", b"MM\x00*")):
+                return payload
+        raise AppError(
+            code="DHMV_PROVIDER_INVALID_RESPONSE",
+            message="The official DHMV multipart response contains no valid GeoTIFF coverage",
+            status_code=502,
+        )
+
+    @staticmethod
+    def _normalize_raster(content: bytes, scope_geometry_4326, prepared: dict[str, Any]) -> tuple[bytes, dict[str, Any]]:
+        try:
+            import numpy as np
+            import rasterio
+            from rasterio.io import MemoryFile
+            from rasterio.mask import mask
+        except ImportError as exc:
+            raise AppError(code="RASTER_PROCESSING_UNAVAILABLE", message="Rasterio and numpy are required for DHMV validation", status_code=503) from exc
+
+        try:
+            with MemoryFile(content) as source_memory, source_memory.open() as source:
+                if source.crs is None or source.crs.to_epsg() != 31370:
+                    raise AppError(code="DHMV_INVALID_CRS", message="DHMV coverage must use EPSG:31370", status_code=502)
+                if source.count != 1:
+                    raise AppError(code="DHMV_INVALID_BANDS", message="DHMV coverage must contain exactly one elevation band", status_code=502)
+                resolution = max(abs(float(source.res[0])), abs(float(source.res[1])))
+                if not math.isclose(resolution, prepared["resolution_m"], rel_tol=0.02, abs_tol=0.05):
+                    raise AppError(
+                        code="DHMV_INVALID_RESOLUTION",
+                        message="DHMV coverage resolution differs from the governed request",
+                        details={"expected_m": prepared["resolution_m"], "actual_m": resolution},
+                        status_code=502,
+                    )
+                transformer = Transformer.from_crs("EPSG:4326", DhmvAcquisitionService.SOURCE_CRS, always_xy=True)
+                scope_metric = shapely_transform(transformer.transform, scope_geometry_4326)
+                clipped, transform = mask(
+                    source,
+                    [mapping(scope_metric)],
+                    crop=True,
+                    filled=False,
+                    indexes=[1],
+                )
+                band = np.ma.asarray(clipped[0], dtype="float32")
+                nodata = float(source.nodata if source.nodata is not None else DhmvAcquisitionService.NODATA)
+                invalid = ~np.isfinite(np.asarray(band.filled(np.nan), dtype="float64"))
+                combined_mask = np.ma.getmaskarray(band) | invalid | (np.asarray(band) == nodata)
+                normalized = np.ma.array(np.asarray(band, dtype="float32"), mask=combined_mask)
+                valid_pixel_count = int(normalized.count())
+                if valid_pixel_count == 0:
+                    raise AppError(code="DHMV_NO_VALID_DATA", message="DHMV coverage contains no valid elevation cells in this selection", status_code=422)
+                profile = source.profile.copy()
+                profile.pop("blockxsize", None)
+                profile.pop("blockysize", None)
+                profile.update(
+                    driver="GTiff",
+                    width=int(normalized.shape[1]),
+                    height=int(normalized.shape[0]),
+                    count=1,
+                    dtype="float32",
+                    crs=DhmvAcquisitionService.SOURCE_CRS,
+                    transform=transform,
+                    nodata=DhmvAcquisitionService.NODATA,
+                    compress="deflate",
+                    predictor=3,
+                )
+                with MemoryFile() as output_memory:
+                    with output_memory.open(**profile) as output:
+                        output.write(normalized.filled(DhmvAcquisitionService.NODATA), 1)
+                    normalized_content = output_memory.read()
+                valid_values = normalized.compressed().astype("float64")
+                return normalized_content, {
+                    "width": int(normalized.shape[1]),
+                    "height": int(normalized.shape[0]),
+                    "valid_pixel_count": valid_pixel_count,
+                    "nodata_value": DhmvAcquisitionService.NODATA,
+                    "resolution_m": resolution,
+                    "minimum_m_taw": float(valid_values.min()),
+                    "maximum_m_taw": float(valid_values.max()),
+                }
+        except AppError:
+            raise
+        except Exception as exc:
+            raise AppError(
+                code="DHMV_RASTER_INVALID",
+                message="The official DHMV response could not be validated as a georeferenced elevation raster",
+                details={"reason": str(exc)},
+                status_code=502,
+            ) from exc
+
+    @staticmethod
+    def acquire(
+        db,
+        project_id: UUID,
+        payload: DhmvAcquireRequest,
+        *,
+        settings: Settings | None = None,
+        opener: Callable[..., Any] | None = None,
+    ) -> dict[str, Any]:
+        resolved_settings = settings or get_settings()
+        prepared = DhmvAcquisitionService._prepared_request(payload, resolved_settings)
+        product: DhmvProduct = prepared["product"]
+        scope_geometry = DhmvAcquisitionService._scope_geometry(db, project_id, payload.area_id, prepared["bbox_epsg4326"])
+        resolution_token = f"{prepared['resolution_m']:g}".replace(".", "p")
+        filename = f"dhmvii_{product.surface_model}_{resolution_token}m_{prepared['request_hash'][:12]}.tif"
+        if not payload.force_refresh:
+            cached = DhmvAcquisitionService._cached_dataset(db, project_id, filename)
+            if cached is not None:
+                source_metadata = cached.source_metadata or {}
+                raster_metadata = cached.metadata_json or {}
+                return DhmvAcquisitionResult(
+                    output_dataset_id=cached.id,
+                    reused=True,
+                    provider=DhmvAcquisitionService.PROVIDER,
+                    product_key=product.key,
+                    display_name=product.display_name,
+                    surface_model=product.surface_model,
+                    coverage_id=product.coverage_id,
+                    native_resolution_m=product.native_resolution_m,
+                    resolution_m=float(source_metadata.get("analysis_resolution_m", prepared["resolution_m"])),
+                    width=int(raster_metadata.get("width", prepared["width"])),
+                    height=int(raster_metadata.get("height", prepared["height"])),
+                    valid_pixel_count=int(source_metadata.get("valid_pixel_count", 0)),
+                    nodata_value=float(raster_metadata.get("nodata", DhmvAcquisitionService.NODATA)),
+                    bbox_epsg4326=prepared["bbox_epsg4326"],
+                    bbox_epsg31370=prepared["bbox_epsg31370"],
+                    vertical_reference=DhmvAcquisitionService.VERTICAL_REFERENCE,
+                    acquisition_period=DhmvAcquisitionService.ACQUISITION_PERIOD,
+                    attribution=DhmvAcquisitionService.ATTRIBUTION,
+                    limitation_message=product.limitation_message,
+                ).model_dump(mode="json")
+
+        raw_content, content_type = DhmvAcquisitionService._fetch(prepared["request_url"], resolved_settings, opener)
+        coverage_content = DhmvAcquisitionService._extract_geotiff(raw_content, content_type)
+        normalized_content, validation = DhmvAcquisitionService._normalize_raster(coverage_content, scope_geometry, prepared)
+        acquired_at = datetime.now(UTC)
+        dataset = DatasetService.import_raster_bytes(
+            db,
+            project_id=project_id,
+            area_id=payload.area_id,
+            filename=filename,
+            content=normalized_content,
+            source=f"Digitaal Vlaanderen WCS {product.coverage_id}",
+            source_name=DhmvAcquisitionService.PROVIDER,
+            temporal_series_key=f"digitaal-vlaanderen:dhmvii:{product.key}:{prepared['request_hash'][:24]}",
+            observed_at=datetime(2015, 12, 31, 23, 59, 59, tzinfo=UTC),
+            valid_from=datetime(2013, 1, 1, tzinfo=UTC),
+            valid_to=datetime(2015, 12, 31, 23, 59, 59, tzinfo=UTC),
+            temporal_granularity="period",
+            source_version=DhmvAcquisitionService.SOURCE_VERSION,
+            content_type="image/tiff",
+            source_metadata={
+                "provider": DhmvAcquisitionService.PROVIDER,
+                "service": "WCS",
+                "service_version": "2.0.1",
+                "product_key": product.key,
+                "product_display_name": product.display_name,
+                "surface_model": product.surface_model,
+                "coverage_id": product.coverage_id,
+                "native_resolution_m": product.native_resolution_m,
+                "analysis_resolution_m": validation["resolution_m"],
+                "source_crs": DhmvAcquisitionService.SOURCE_CRS,
+                "vertical_reference": DhmvAcquisitionService.VERTICAL_REFERENCE,
+                "vertical_unit": "m",
+                "acquisition_period": DhmvAcquisitionService.ACQUISITION_PERIOD,
+                "observation_date_precision": "period",
+                "nodata_value": validation["nodata_value"],
+                "valid_pixel_count": validation["valid_pixel_count"],
+                "minimum_m_taw": validation["minimum_m_taw"],
+                "maximum_m_taw": validation["maximum_m_taw"],
+                "bbox_epsg4326": prepared["bbox_epsg4326"],
+                "bbox_epsg31370": prepared["bbox_epsg31370"],
+                "catalog_url": product.catalog_url,
+                "attribution": DhmvAcquisitionService.ATTRIBUTION,
+                "license_note": DhmvAcquisitionService.LICENSE_NOTE,
+                "theme": "elevation",
+                "coverage_scope": "municipality" if payload.area_id else "bounded_selection",
+            },
+            provenance_metadata={
+                "acquisition": "explicit_bounded_wcs_coverage",
+                "acquired_at": acquired_at.isoformat(),
+                "request_hash": prepared["request_hash"],
+                "request_url": prepared["request_url"],
+                "response_content_type": content_type,
+                "response_sha256": hashlib.sha256(raw_content).hexdigest(),
+                "coverage_sha256": hashlib.sha256(coverage_content).hexdigest(),
+                "normalized_sha256": hashlib.sha256(normalized_content).hexdigest(),
+                "bbox_epsg4326": prepared["bbox_epsg4326"],
+                "bbox_epsg31370": prepared["bbox_epsg31370"],
+                "requested_resolution_m": prepared["resolution_m"],
+                "clipped_to_area_id": str(payload.area_id) if payload.area_id else None,
+                "validation": validation,
+                "limitation_message": product.limitation_message,
+                "water_depth_available": False,
+                "water_volume_available": False,
+            },
+        )
+        return DhmvAcquisitionResult(
+            output_dataset_id=dataset.id,
+            reused=False,
+            provider=DhmvAcquisitionService.PROVIDER,
+            product_key=product.key,
+            display_name=product.display_name,
+            surface_model=product.surface_model,
+            coverage_id=product.coverage_id,
+            native_resolution_m=product.native_resolution_m,
+            resolution_m=validation["resolution_m"],
+            width=validation["width"],
+            height=validation["height"],
+            valid_pixel_count=validation["valid_pixel_count"],
+            nodata_value=validation["nodata_value"],
+            bbox_epsg4326=prepared["bbox_epsg4326"],
+            bbox_epsg31370=prepared["bbox_epsg31370"],
+            vertical_reference=DhmvAcquisitionService.VERTICAL_REFERENCE,
+            acquisition_period=DhmvAcquisitionService.ACQUISITION_PERIOD,
+            attribution=DhmvAcquisitionService.ATTRIBUTION,
+            limitation_message=product.limitation_message,
+        ).model_dump(mode="json")

backend/app/services/terrain_analysis_service.py

@@ -0,0 +1,254 @@
+from __future__ import annotations
+
+import io
+import math
+from datetime import UTC, datetime
+from pathlib import Path
+from uuid import UUID
+
+from geoalchemy2.shape import to_shape
+from pyproj import Transformer
+from shapely.geometry import box, mapping
+from shapely.ops import transform as shapely_transform
+
+from app.core.config import Settings, get_settings
+from app.core.errors import AppError
+from app.models import Area, Dataset
+from app.schemas.dhmv import TerrainMetric, TerrainSelectionRequest, TerrainSelectionResponse, TerrainSelectionSummary
+from app.services.dhmv_acquisition_service import DhmvAcquisitionService
+
+
+class TerrainAnalysisService:
+    UNSUPPORTED_METRICS = ["water_depth_m", "water_volume_m3"]
+    LIMITATION = (
+        "Hoogte, reliëf en helling zijn afgeleid uit DHMV II. Afstroming vraagt bijkomende hydrologische modellering. "
+        "Waterdiepte en watervolume zijn niet beschikbaar uit DTM/DSM alleen."
+    )
+
+    @staticmethod
+    def _load_dataset(db, project_id: UUID, dataset_id: UUID) -> Dataset:
+        dataset = db.get(Dataset, dataset_id)
+        if not dataset or dataset.project_id != project_id:
+            raise AppError(code="DATASET_NOT_FOUND", message="Dataset not found", status_code=404)
+        if dataset.dataset_type != "raster" or dataset.source_name != DhmvAcquisitionService.PROVIDER:
+            raise AppError(
+                code="INVALID_TERRAIN_DATASET",
+                message="Terrain analysis requires a governed DHMV raster dataset",
+                status_code=400,
+            )
+        if dataset.status != "ready" or not dataset.storage_path or not Path(dataset.storage_path).is_file():
+            raise AppError(code="DATASET_FILE_MISSING", message="Persisted DHMV raster file is unavailable", status_code=404)
+        return dataset
+
+    @staticmethod
+    def _selection_geometry(db, project_id: UUID, payload: TerrainSelectionRequest):
+        selection = box(payload.bbox.min_x, payload.bbox.min_y, payload.bbox.max_x, payload.bbox.max_y)
+        if payload.area_id is None:
+            return selection
+        area = db.get(Area, payload.area_id)
+        if not area:
+            raise AppError(code="AREA_NOT_FOUND", message="Area not found", status_code=404)
+        if area.project_id != project_id:
+            raise AppError(code="INVALID_DATASET_SCOPE", message="Area does not belong to this project", status_code=400)
+        selection = selection.intersection(to_shape(area.geometry))
+        if selection.is_empty or selection.area <= 0:
+            raise AppError(code="TERRAIN_SELECTION_OUTSIDE_AREA", message="Selection does not overlap the selected work area", status_code=422)
+        return selection
+
+    @staticmethod
+    def analyze(
+        db,
+        project_id: UUID,
+        dataset_id: UUID,
+        payload: TerrainSelectionRequest,
+        *,
+        settings: Settings | None = None,
+    ) -> dict:
+        resolved_settings = settings or get_settings()
+        dataset = TerrainAnalysisService._load_dataset(db, project_id, dataset_id)
+        selection_4326 = TerrainAnalysisService._selection_geometry(db, project_id, payload)
+        try:
+            import numpy as np
+            import rasterio
+            from rasterio.features import geometry_mask
+            from rasterio.mask import mask
+        except ImportError as exc:
+            raise AppError(code="RASTER_PROCESSING_UNAVAILABLE", message="Rasterio and numpy are required for terrain analysis", status_code=503) from exc
+
+        source_metadata = dataset.source_metadata or {}
+        product_key = str(source_metadata.get("product_key") or "")
+        surface_model = str(source_metadata.get("surface_model") or "")
+        if product_key not in DhmvAcquisitionService._products() or surface_model not in {"terrain", "surface"}:
+            raise AppError(code="INVALID_TERRAIN_METADATA", message="DHMV product provenance is incomplete", status_code=409)
+
+        try:
+            with rasterio.open(dataset.storage_path) as source:
+                if source.crs is None:
+                    raise AppError(code="INVALID_DATASET_CRS", message="DHMV raster CRS is missing", status_code=409)
+                transformer = Transformer.from_crs("EPSG:4326", source.crs, always_xy=True)
+                selection_metric = shapely_transform(transformer.transform, selection_4326)
+                source_extent = box(*source.bounds)
+                analysis_geometry = selection_metric.intersection(source_extent)
+                if analysis_geometry.is_empty or analysis_geometry.area <= 0:
+                    raise AppError(
+                        code="TERRAIN_SELECTION_OUTSIDE_DATASET",
+                        message="Selection does not overlap the persisted DHMV raster",
+                        status_code=422,
+                    )
+                min_x, min_y, max_x, max_y = analysis_geometry.bounds
+                expected_cells = math.ceil((max_x - min_x) / abs(source.res[0])) * math.ceil((max_y - min_y) / abs(source.res[1]))
+                if expected_cells > resolved_settings.dhmv_max_pixels:
+                    raise AppError(
+                        code="TERRAIN_SELECTION_TOO_LARGE",
+                        message="Terrain analysis exceeds the configured raster cell limit",
+                        details={"pixel_count": expected_cells, "max_pixels": resolved_settings.dhmv_max_pixels},
+                        status_code=422,
+                    )
+                clipped, clipped_transform = mask(
+                    source,
+                    [mapping(analysis_geometry)],
+                    crop=True,
+                    filled=False,
+                    indexes=[1],
+                )
+                elevation = np.ma.asarray(clipped[0], dtype="float64")
+                raw = elevation.filled(np.nan)
+                nodata = source.nodata
+                invalid = ~np.isfinite(raw)
+                if nodata is not None:
+                    invalid |= raw == float(nodata)
+                selected_cells = geometry_mask(
+                    [mapping(analysis_geometry)],
+                    out_shape=elevation.shape,
+                    transform=clipped_transform,
+                    invert=True,
+                )
+                valid_mask = selected_cells & ~np.ma.getmaskarray(elevation) & ~invalid
+                values = raw[valid_mask]
+                if values.size == 0:
+                    raise AppError(code="TERRAIN_NO_VALID_DATA", message="No valid DHMV height cells occur in this selection", status_code=422)
+
+                resolution_x = abs(float(source.res[0]))
+                resolution_y = abs(float(source.res[1]))
+                slope_values = np.asarray([], dtype="float64")
+                if raw.shape[0] >= 2 and raw.shape[1] >= 2:
+                    surface = np.where(valid_mask, raw, np.nan)
+                    gradient_y, gradient_x = np.gradient(surface, resolution_y, resolution_x)
+                    slope = np.degrees(np.arctan(np.hypot(gradient_x, gradient_y)))
+                    slope_values = slope[np.isfinite(slope) & valid_mask]
+        except AppError:
+            raise
+        except Exception as exc:
+            raise AppError(
+                code="TERRAIN_ANALYSIS_FAILED",
+                message="The persisted DHMV raster could not be analysed",
+                details={"reason": str(exc)},
+                status_code=500,
+            ) from exc
+
+        def metric(key: str, label: str, value: float, unit: str, method: str) -> TerrainMetric:
+            return TerrainMetric(
+                metric_key=key,
+                metric_label=label,
+                metric_value=round(float(value), 4),
+                metric_unit=unit,
+                aggregation_method=method,
+            )
+
+        prefix = "terrain" if surface_model == "terrain" else "surface"
+        elevation_label = "Gemiddelde maaiveldhoogte" if surface_model == "terrain" else "Gemiddelde oppervlaktehoogte"
+        metrics = [
+            metric(f"{prefix}_elevation_mean_m", elevation_label, values.mean(), "m TAW", "mean_valid_cells"),
+            metric(f"{prefix}_elevation_min_m", "Laagste hoogte", values.min(), "m TAW", "minimum_valid_cells"),
+            metric(f"{prefix}_elevation_max_m", "Hoogste hoogte", values.max(), "m TAW", "maximum_valid_cells"),
+            metric(f"{prefix}_elevation_p10_m", "10e percentiel hoogte", np.percentile(values, 10), "m TAW", "percentile_10_valid_cells"),
+            metric(f"{prefix}_elevation_p90_m", "90e percentiel hoogte", np.percentile(values, 90), "m TAW", "percentile_90_valid_cells"),
+            metric("relief_m", "Reliëfverschil", values.max() - values.min(), "m", "maximum_minus_minimum"),
+        ]
+        if slope_values.size:
+            metrics.extend(
+                [
+                    metric("slope_mean_deg", "Gemiddelde helling", slope_values.mean(), "°", "mean_finite_gradient"),
+                    metric("slope_p90_deg", "90e percentiel helling", np.percentile(slope_values, 90), "°", "percentile_90_finite_gradient"),
+                    metric("slope_max_deg", "Steilste helling", slope_values.max(), "°", "maximum_finite_gradient"),
+                ]
+            )
+        primary = metrics[0]
+        selected_cell_count = int(selected_cells.sum())
+        response = TerrainSelectionResponse(
+            dataset_id=dataset.id,
+            product_key=product_key,
+            surface_model=surface_model,
+            selection_bbox=payload.bbox,
+            selection_area_id=payload.area_id,
+            sample_count=int(values.size),
+            slope_sample_count=int(slope_values.size),
+            coverage_ratio=round(float(values.size / max(1, selected_cell_count)), 6),
+            resolution_m=round(max(resolution_x, resolution_y), 4),
+            vertical_reference=str(source_metadata.get("vertical_reference") or DhmvAcquisitionService.VERTICAL_REFERENCE),
+            summary=TerrainSelectionSummary(
+                metric_label=primary.metric_label,
+                metric_value=primary.metric_value,
+                metric_unit=primary.metric_unit,
+                aggregation_method=primary.aggregation_method,
+                primary_metric_key=primary.metric_key,
+                metrics=metrics,
+            ),
+            unsupported_metrics=TerrainAnalysisService.UNSUPPORTED_METRICS,
+            limitation_message=TerrainAnalysisService.LIMITATION,
+            generated_at=datetime.now(UTC).isoformat(),
+        )
+        return response.model_dump(mode="json")
+
+    @staticmethod
+    def render_png(db, project_id: UUID, dataset_id: UUID, *, max_dimension: int = 1800) -> bytes:
+        dataset = TerrainAnalysisService._load_dataset(db, project_id, dataset_id)
+        try:
+            import numpy as np
+            import rasterio
+            from PIL import Image
+            from rasterio.enums import Resampling
+        except ImportError as exc:
+            raise AppError(code="RASTER_PROCESSING_UNAVAILABLE", message="Rasterio, numpy and Pillow are required for terrain rendering", status_code=503) from exc
+
+        try:
+            with rasterio.open(dataset.storage_path) as source:
+                scale = min(1.0, max_dimension / max(source.width, source.height))
+                width = max(1, round(source.width * scale))
+                height = max(1, round(source.height * scale))
+                data = source.read(1, out_shape=(height, width), masked=True, resampling=Resampling.bilinear)
+                values = np.asarray(data.filled(np.nan), dtype="float64")
+                valid = np.isfinite(values) & ~np.ma.getmaskarray(data)
+                if not valid.any():
+                    raise AppError(code="TERRAIN_NO_VALID_DATA", message="DHMV raster contains no renderable cells", status_code=422)
+                low, high = np.percentile(values[valid], [2, 98])
+                if high <= low:
+                    high = low + 1.0
+                normalized = np.clip((values - low) / (high - low), 0.0, 1.0)
+                stops = np.asarray([0.0, 0.25, 0.5, 0.75, 1.0])
+                colors = np.asarray(
+                    [
+                        [30, 94, 91],
+                        [79, 139, 102],
+                        [194, 183, 105],
+                        [173, 121, 79],
+                        [105, 94, 108],
+                    ],
+                    dtype="float64",
+                )
+                rgba = np.zeros((height, width, 4), dtype="uint8")
+                for channel in range(3):
+                    rgba[:, :, channel] = np.interp(normalized, stops, colors[:, channel]).astype("uint8")
+                rgba[:, :, 3] = np.where(valid, 225, 0).astype("uint8")
+                output = io.BytesIO()
+                Image.fromarray(rgba).save(output, format="PNG", optimize=True)
+                return output.getvalue()
+        except AppError:
+            raise
+        except Exception as exc:
+            raise AppError(
+                code="TERRAIN_PREVIEW_FAILED",
+                message="The persisted DHMV raster could not be rendered",
+                details={"reason": str(exc)},
+                status_code=500,
+            ) from exc

backend/tests/test_sprint205_dhmv_terrain.py

@@ -0,0 +1,404 @@
+from __future__ import annotations
+
+from pathlib import Path
+from uuid import uuid4
+
+import numpy as np
+import pytest
+import rasterio
+from fastapi.testclient import TestClient
+from geoalchemy2.shape import from_shape
+from pyproj import Transformer
+from rasterio.io import MemoryFile
+from rasterio.transform import from_origin
+from shapely.geometry import MultiPolygon, box
+
+from app.core.config import Settings
+from app.core.errors import AppError
+from app.db.session import get_db
+from app.main import app
+from app.models import Area, Dataset, DatasetVersion, Job, Project
+from app.schemas.dhmv import DhmvAcquireRequest, TerrainSelectionRequest
+from app.services.dhmv_acquisition_service import DhmvAcquisitionService
+from app.services.terrain_analysis_service import TerrainAnalysisService
+
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+class FakeQuery:
+    def __init__(self, result=None):
+        self.result = result
+
+    def filter(self, *_args):
+        return self
+
+    def order_by(self, *_args):
+        return self
+
+    def first(self):
+        return self.result
+
+
+class FakeSession:
+    def __init__(self, rows=None, query_result=None):
+        self.rows = rows or {}
+        self.query_result = query_result
+        self.added = []
+
+    def get(self, model, row_id):
+        row = self.rows.get((model, row_id))
+        if row is not None:
+            return row
+        return next((item for item in self.added if isinstance(item, model) and item.id == row_id), None)
+
+    def add(self, row):
+        self.added.append(row)
+
+    def commit(self):
+        return None
+
+    def rollback(self):
+        return None
+
+    def refresh(self, row):
+        return row
+
+    def query(self, _model):
+        return FakeQuery(self.query_result)
+
+
+class FakeResponse:
+    def __init__(self, content: bytes, content_type: str):
+        self.content = content
+        self.headers = {"Content-Type": content_type, "Content-Length": str(len(content))}
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *_args):
+        return None
+
+    def read(self, limit: int):
+        return self.content[:limit]
+
+
+def lambert_bbox_payload(*, side_m: float = 100.0, product_key: str = "dtm_1m", area_id=None) -> DhmvAcquireRequest:
+    west, south = 200_000.0, 210_000.0
+    transformer = Transformer.from_crs("EPSG:31370", "EPSG:4326", always_xy=True)
+    min_x, min_y = transformer.transform(west, south)
+    max_x, max_y = transformer.transform(west + side_m, south + side_m)
+    return DhmvAcquireRequest(
+        bbox={"min_x": min_x, "min_y": min_y, "max_x": max_x, "max_y": max_y, "crs": "EPSG:4326"},
+        area_id=area_id,
+        product_key=product_key,
+        resolution_m=5.0,
+        force_refresh=True,
+    )
+
+
+def elevation_tiff(*, left: float, top: float, width: int, height: int, resolution: float = 5.0) -> bytes:
+    rows, columns = np.indices((height, width))
+    values = (20.0 + columns * 0.5 + rows * 1.0).astype("float32")
+    with MemoryFile() as memory:
+        with memory.open(
+            driver="GTiff",
+            width=width,
+            height=height,
+            count=1,
+            dtype="float32",
+            crs="EPSG:31370",
+            transform=from_origin(left, top, resolution, resolution),
+            nodata=-9999.0,
+        ) as output:
+            output.write(values, 1)
+        return memory.read()
+
+
+def multipart_tiff(content: bytes) -> tuple[bytes, str]:
+    boundary = "wcs-test"
+    payload = (
+        f"--{boundary}\r\nContent-Type: text/xml\r\nContent-ID: GML-Part\r\n\r\n<coverage/>\r\n"
+        f"--{boundary}\r\nContent-Type: image/tiff\r\nContent-ID: coverage.tif\r\n\r\n"
+    ).encode() + content + f"\r\n--{boundary}--\r\n".encode()
+    return payload, f'multipart/mixed; boundary="{boundary}"'
+
+
+def test_dhmv_registry_is_governed_and_semantically_explicit() -> None:
+    products = DhmvAcquisitionService.list_products()
+
+    assert [item["key"] for item in products] == ["dtm_1m", "dsm_1m"]
+    assert {item["coverage_id"] for item in products} == {"DHMVII_DTM_1m", "DHMVII_DSM_1m"}
+    assert all(item["native_resolution_m"] == 1.0 for item in products)
+    assert all(item["source_crs"] == "EPSG:31370" for item in products)
+    assert all("TAW" in item["vertical_reference"] for item in products)
+    assert all(item["acquisition_period"] == "2013-2015" for item in products)
+    assert "waterdiepte" in products[0]["limitation_message"]
+
+
+def test_dhmv_request_uses_bounded_official_wcs_scaling() -> None:
+    prepared = DhmvAcquisitionService._prepared_request(lambert_bbox_payload(), Settings(_env_file=None))
+
+    assert prepared["coverage_id"] == "DHMVII_DTM_1m"
+    assert prepared["params"]["SCALEFACTOR"] == "5"
+    assert prepared["params"]["SUBSET"][0].startswith("x(")
+    assert prepared["params"]["SUBSET"][1].startswith("y(")
+    assert "geo.api.vlaanderen.be%2FDHMV" not in prepared["request_url"]
+    assert prepared["request_url"].startswith("https://geo.api.vlaanderen.be/DHMV/wcs?")
+    assert prepared["width"] * prepared["height"] <= 12_000_000
+    assert len(prepared["request_hash"]) == 64
+
+    with pytest.raises(AppError) as exc_info:
+        DhmvAcquisitionService._prepared_request(
+            lambert_bbox_payload(product_key="arbitrary"),
+            Settings(_env_file=None),
+        )
+    assert exc_info.value.code == "DHMV_PRODUCT_NOT_SUPPORTED"
+
+
+def test_dhmv_request_rejects_unsafe_size_and_resolution() -> None:
+    with pytest.raises(AppError) as exc_info:
+        DhmvAcquisitionService._prepared_request(lambert_bbox_payload(side_m=5.0), Settings(_env_file=None))
+    assert exc_info.value.code == "DHMV_SELECTION_TOO_SMALL"
+
+    payload = lambert_bbox_payload()
+    payload.resolution_m = 0.5
+    with pytest.raises(Exception):
+        DhmvAcquireRequest.model_validate(payload.model_dump())
+
+
+def test_dhmv_multipart_geotiff_is_extracted_and_invalid_response_fails_closed() -> None:
+    tiff = elevation_tiff(left=200_000, top=210_100, width=20, height=20)
+    multipart, content_type = multipart_tiff(tiff)
+
+    assert DhmvAcquisitionService._extract_geotiff(multipart, content_type) == tiff
+    with pytest.raises(AppError) as exc_info:
+        DhmvAcquisitionService._extract_geotiff(b"<ServiceException/>", "text/xml")
+    assert exc_info.value.code == "DHMV_PROVIDER_INVALID_RESPONSE"
+
+
+def test_dhmv_acquisition_clips_validates_and_persists_via_dataset_service(tmp_path) -> None:
+    project_id = uuid4()
+    area_id = uuid4()
+    payload = lambert_bbox_payload(area_id=area_id)
+    area_geometry = MultiPolygon([box(payload.bbox.min_x, payload.bbox.min_y, payload.bbox.max_x, payload.bbox.max_y)])
+    db = FakeSession(
+        {
+            (Project, project_id): Project(id=project_id, name="Mol"),
+            (Area, area_id): Area(
+                id=area_id,
+                project_id=project_id,
+                name="Gemeente Mol",
+                geometry=from_shape(area_geometry, srid=4326),
+            ),
+        }
+    )
+    settings = Settings(_env_file=None, storage_root=str(tmp_path), dhmv_resolution_m=5.0)
+    prepared = DhmvAcquisitionService._prepared_request(payload, settings)
+    tiff = elevation_tiff(
+        left=prepared["bbox_epsg31370"][0],
+        top=prepared["bbox_epsg31370"][3],
+        width=prepared["width"],
+        height=prepared["height"],
+    )
+    multipart, content_type = multipart_tiff(tiff)
+
+    result = DhmvAcquisitionService.acquire(
+        db,
+        project_id,
+        payload,
+        settings=settings,
+        opener=lambda *_args, **_kwargs: FakeResponse(multipart, content_type),
+    )
+
+    dataset = next(item for item in db.added if isinstance(item, Dataset))
+    version = next(item for item in db.added if isinstance(item, DatasetVersion))
+    assert result["output_dataset_id"] == str(dataset.id)
+    assert dataset.source_name == "digitaal_vlaanderen_dhmv"
+    assert dataset.area_id == area_id
+    assert dataset.dataset_type == "raster"
+    assert dataset.crs == "EPSG:31370"
+    assert dataset.checksum_sha256 == version.checksum_sha256
+    assert dataset.source_metadata["surface_model"] == "terrain"
+    assert dataset.source_metadata["native_resolution_m"] == 1.0
+    assert dataset.source_metadata["analysis_resolution_m"] == 5.0
+    assert dataset.source_metadata["nodata_value"] == -9999.0
+    assert dataset.provenance_metadata["water_depth_available"] is False
+    assert dataset.provenance_metadata["water_volume_available"] is False
+    assert len(dataset.provenance_metadata["response_sha256"]) == 64
+    with rasterio.open(dataset.storage_path) as stored:
+        assert stored.crs.to_epsg() == 31370
+        assert stored.count == 1
+        assert stored.nodata == -9999.0
+        assert stored.res == pytest.approx((5.0, 5.0))
+
+
+def test_terrain_analysis_returns_governed_elevation_relief_and_slope(tmp_path) -> None:
+    project_id = uuid4()
+    dataset_id = uuid4()
+    path = tmp_path / "terrain.tif"
+    path.write_bytes(elevation_tiff(left=200_000, top=210_100, width=20, height=20))
+    to_wgs84 = Transformer.from_crs("EPSG:31370", "EPSG:4326", always_xy=True)
+    min_x, min_y = to_wgs84.transform(200_000, 210_000)
+    max_x, max_y = to_wgs84.transform(200_100, 210_100)
+    dataset = Dataset(
+        id=dataset_id,
+        project_id=project_id,
+        name="dhmvii_terrain_5m.tif",
+        dataset_type="raster",
+        source="official WCS",
+        source_name="digitaal_vlaanderen_dhmv",
+        source_metadata={
+            "product_key": "dtm_1m",
+            "surface_model": "terrain",
+            "vertical_reference": "TAW (Tweede Algemene Waterpassing)",
+        },
+        status="ready",
+        storage_path=str(path),
+    )
+    db = FakeSession({(Dataset, dataset_id): dataset})
+    payload = TerrainSelectionRequest(
+        bbox={"min_x": min_x, "min_y": min_y, "max_x": max_x, "max_y": max_y, "crs": "EPSG:4326"}
+    )
+
+    result = TerrainAnalysisService.analyze(db, project_id, dataset_id, payload, settings=Settings(_env_file=None))
+    metrics = {item["metric_key"]: item for item in result["summary"]["metrics"]}
+
+    assert result["sample_count"] > 300
+    assert result["coverage_ratio"] > 0.99
+    assert result["resolution_m"] == 5.0
+    assert result["summary"]["metric_unit"] == "m TAW"
+    assert metrics["relief_m"]["metric_value"] > 20
+    assert metrics["slope_mean_deg"]["metric_value"] == pytest.approx(12.6044, abs=0.01)
+    assert result["unsupported_metrics"] == ["water_depth_m", "water_volume_m3"]
+    assert "Waterdiepte" in result["limitation_message"]
+
+
+def test_terrain_analysis_rejects_non_dhmv_raster(tmp_path) -> None:
+    project_id = uuid4()
+    dataset_id = uuid4()
+    path = tmp_path / "other.tif"
+    path.write_bytes(elevation_tiff(left=200_000, top=210_100, width=20, height=20))
+    dataset = Dataset(
+        id=dataset_id,
+        project_id=project_id,
+        name="other.tif",
+        dataset_type="raster",
+        source="manual",
+        source_name="manual",
+        status="ready",
+        storage_path=str(path),
+    )
+    db = FakeSession({(Dataset, dataset_id): dataset})
+
+    with pytest.raises(AppError) as exc_info:
+        TerrainAnalysisService.analyze(db, project_id, dataset_id, TerrainSelectionRequest(bbox=lambert_bbox_payload().bbox))
+    assert exc_info.value.code == "INVALID_TERRAIN_DATASET"
+
+
+def test_terrain_renderer_returns_browser_png(tmp_path) -> None:
+    project_id = uuid4()
+    dataset_id = uuid4()
+    path = tmp_path / "terrain.tif"
+    path.write_bytes(elevation_tiff(left=200_000, top=210_100, width=20, height=20))
+    dataset = Dataset(
+        id=dataset_id,
+        project_id=project_id,
+        name="terrain.tif",
+        dataset_type="raster",
+        source="official",
+        source_name="digitaal_vlaanderen_dhmv",
+        source_metadata={"product_key": "dtm_1m", "surface_model": "terrain"},
+        status="ready",
+        storage_path=str(path),
+    )
+    db = FakeSession({(Dataset, dataset_id): dataset})
+
+    assert TerrainAnalysisService.render_png(db, project_id, dataset_id).startswith(b"\x89PNG\r\n\x1a\n")
+
+
+def test_dhmv_endpoints_use_canonical_envelopes(monkeypatch) -> None:
+    project_id = uuid4()
+    output_dataset_id = uuid4()
+    db = FakeSession({(Project, project_id): Project(id=project_id, name="Mol")})
+    monkeypatch.setattr(
+        DhmvAcquisitionService,
+        "acquire",
+        lambda *_args, **_kwargs: {
+            "output_dataset_id": str(output_dataset_id),
+            "provider": "digitaal_vlaanderen_dhmv",
+            "reused": False,
+        },
+    )
+    monkeypatch.setattr(
+        TerrainAnalysisService,
+        "analyze",
+        lambda *_args, **_kwargs: {
+            "dataset_id": str(output_dataset_id),
+            "sample_count": 100,
+            "summary": {"metric_value": 25.0, "metric_unit": "m TAW", "metrics": []},
+            "unsupported_metrics": ["water_depth_m", "water_volume_m3"],
+        },
+    )
+    app.dependency_overrides[get_db] = lambda: db
+    try:
+        products = TestClient(app).get(f"/api/v1/projects/{project_id}/datasets/dhmv/products")
+        acquisition = TestClient(app).post(
+            f"/api/v1/projects/{project_id}/datasets/dhmv/acquire",
+            json=lambert_bbox_payload().model_dump(mode="json"),
+        )
+        terrain = TestClient(app).post(
+            f"/api/v1/projects/{project_id}/datasets/{output_dataset_id}/raster/terrain/select",
+            json={"bbox": lambert_bbox_payload().bbox.model_dump()},
+        )
+    finally:
+        app.dependency_overrides.clear()
+
+    assert products.status_code == 200
+    assert set(products.json()) == {"data"}
+    assert products.json()["data"]["total"] == 2
+    assert acquisition.status_code == 200
+    assert set(acquisition.json()) == {"data"}
+    assert acquisition.json()["data"]["job_type"] == "raster.dhmv.acquire"
+    assert acquisition.json()["data"]["output_dataset_id"] == str(output_dataset_id)
+    assert terrain.status_code == 200
+    assert set(terrain.json()) == {"data"}
+    assert terrain.json()["data"]["sample_count"] == 100
+    assert terrain.json()["data"]["unsupported_metrics"] == ["water_depth_m", "water_volume_m3"]
+    assert any(isinstance(item, Job) for item in db.added)
+
+
+def test_frontend_and_runtime_expose_dhmv_workflow() -> None:
+    app_source = (ROOT / "frontend" / "src" / "App.tsx").read_text(encoding="utf-8")
+    map_source = (ROOT / "frontend" / "src" / "components" / "map" / "MapWorkspace.tsx").read_text(encoding="utf-8")
+    hook_source = (ROOT / "frontend" / "src" / "hooks" / "useMapSelectionExtract.ts").read_text(encoding="utf-8")
+    service_source = (ROOT / "frontend" / "src" / "services" / "api" / "datasets.ts").read_text(encoding="utf-8")
+
+    assert "digitaal_vlaanderen_dhmv" in app_source
+    assert "Hoogte & reliëf" in map_source
+    assert "terrainImageUrl" in map_source
+    assert "selectTerrain" in hook_source
+    assert "/raster/terrain/select" in service_source
+    for path in (
+        ROOT / ".env.example",
+        ROOT / "docker-compose.yml",
+        ROOT / "docker-compose.unraid.yml",
+        ROOT / "deploy" / "unraid" / "run-dockerman-container.sh",
+        ROOT / "deploy" / "unraid" / "geointel-unraid-template.xml",
+    ):
+        content = path.read_text(encoding="utf-8")
+        assert "DHMV_ENABLED" in content
+        assert "DHMV_RESOLUTION_M" in content
+        assert "DHMV_MAX_PIXELS" in content
+
+
+def test_dhmv_operator_is_packaged_and_release_checked() -> None:
+    operator = (ROOT / "scripts" / "provision_mol_dhmv.py").read_text(encoding="utf-8")
+    readiness = (ROOT / "scripts" / "run_readiness_check.sh").read_text(encoding="utf-8")
+    dockerfile = (ROOT / "backend" / "Dockerfile").read_text(encoding="utf-8")
+
+    assert "/datasets/dhmv/acquire" in operator
+    assert "/raster/terrain/select" in operator
+    assert "water_depth_m" in operator
+    assert "py_compile scripts/provision_mol_dhmv.py" in readiness
+    assert "COPY . /app" in dockerfile

deploy/unraid/geointel-unraid-template.xml

@@ -34,6 +34,11 @@
   <Config Name="Orthophoto WMS URL" Target="ORTHOPHOTO_WMS_URL" Default="https://geo.api.vlaanderen.be/OMWRGBMRVL/wms" Mode="" Description="Official Digitaal Vlaanderen most-recent winter orthophoto WMS endpoint." Type="Variable" Display="advanced" Required="true" Mask="false">https://geo.api.vlaanderen.be/OMWRGBMRVL/wms</Config>
   <Config Name="Orthophoto Resolution (m)" Target="ORTHOPHOTO_RESOLUTION_M" Default="1.0" Mode="" Description="Requested analysis sampling in metres per pixel. Keep at 1.0 for the active building model profile." Type="Variable" Display="advanced" Required="true" Mask="false">1.0</Config>
   <Config Name="Orthophoto Maximum Side (m)" Target="ORTHOPHOTO_MAX_SIDE_M" Default="1024" Mode="" Description="Safety limit for each selected rectangle side before external acquisition and local inference." Type="Variable" Display="advanced" Required="true" Mask="false">1024</Config>
+  <Config Name="Official DHMV Acquisition" Target="DHMV_ENABLED" Default="true" Mode="" Description="Allow bounded official DHMV II terrain and surface raster acquisition." Type="Variable" Display="advanced" Required="true" Mask="false">true</Config>
+  <Config Name="DHMV WCS URL" Target="DHMV_WCS_URL" Default="https://geo.api.vlaanderen.be/DHMV/wcs" Mode="" Description="Official Digitaal Vlaanderen DHMV WCS endpoint." Type="Variable" Display="advanced" Required="true" Mask="false">https://geo.api.vlaanderen.be/DHMV/wcs</Config>
+  <Config Name="DHMV Analysis Resolution (m)" Target="DHMV_RESOLUTION_M" Default="5.0" Mode="" Description="Stored analysis grid resolution. Native source resolution remains recorded as 1 metre." Type="Variable" Display="advanced" Required="true" Mask="false">5.0</Config>
+  <Config Name="DHMV Maximum Side (m)" Target="DHMV_MAX_SIDE_M" Default="20000" Mode="" Description="Maximum bounded terrain request side length." Type="Variable" Display="advanced" Required="true" Mask="false">20000</Config>
+  <Config Name="DHMV Maximum Cells" Target="DHMV_MAX_PIXELS" Default="12000000" Mode="" Description="Maximum raster cells per acquisition or selection analysis." Type="Variable" Display="advanced" Required="true" Mask="false">12000000</Config>
   <Config Name="Local Ollama Assistant" Target="OLLAMA_ENABLED" Default="true" Mode="" Description="Enable the source-grounded GeoIntel assistant backed by Ollama on the Unraid host." Type="Variable" Display="always" Required="true" Mask="false">true</Config>
   <Config Name="Ollama Base URL" Target="OLLAMA_BASE_URL" Default="http://host.docker.internal:11434" Mode="" Description="Ollama API reachable from the container. The deployment maps host.docker.internal to the Unraid host gateway." Type="Variable" Display="always" Required="true" Mask="false">http://host.docker.internal:11434</Config>
   <Config Name="Default Ollama Model" Target="OLLAMA_DEFAULT_MODEL" Default="qwen3.5:9b" Mode="" Description="Preferred locally installed Ollama model. Users can select another installed model in GeoIntel." Type="Variable" Display="always" Required="true" Mask="false">qwen3.5:9b</Config>

deploy/unraid/geointel.env.example

@@ -32,6 +32,14 @@ ORTHOPHOTO_RESOLUTION_M=1.0
 ORTHOPHOTO_MIN_SIDE_M=128
 ORTHOPHOTO_MAX_SIDE_M=1024
 ORTHOPHOTO_CACHE_TTL_HOURS=24
+DHMV_ENABLED=true
+DHMV_WCS_URL=https://geo.api.vlaanderen.be/DHMV/wcs
+DHMV_RESOLUTION_M=5.0
+DHMV_MIN_SIDE_M=10
+DHMV_MAX_SIDE_M=20000
+DHMV_MAX_PIXELS=12000000
+DHMV_TIMEOUT_SECONDS=300
+DHMV_MAX_RESPONSE_MB=160
 
 # Optional configured-YOLO runtime. Keep disabled unless a local model is mounted.
 GEOINTEL_INSTALL_AI=false

deploy/unraid/run-dockerman-container.sh

@@ -27,6 +27,14 @@ ORTHOPHOTO_RESOLUTION_M="${ORTHOPHOTO_RESOLUTION_M:-1.0}"
 ORTHOPHOTO_MIN_SIDE_M="${ORTHOPHOTO_MIN_SIDE_M:-128}"
 ORTHOPHOTO_MAX_SIDE_M="${ORTHOPHOTO_MAX_SIDE_M:-1024}"
 ORTHOPHOTO_CACHE_TTL_HOURS="${ORTHOPHOTO_CACHE_TTL_HOURS:-24}"
+DHMV_ENABLED="${DHMV_ENABLED:-true}"
+DHMV_WCS_URL="${DHMV_WCS_URL:-https://geo.api.vlaanderen.be/DHMV/wcs}"
+DHMV_RESOLUTION_M="${DHMV_RESOLUTION_M:-5.0}"
+DHMV_MIN_SIDE_M="${DHMV_MIN_SIDE_M:-10}"
+DHMV_MAX_SIDE_M="${DHMV_MAX_SIDE_M:-20000}"
+DHMV_MAX_PIXELS="${DHMV_MAX_PIXELS:-12000000}"
+DHMV_TIMEOUT_SECONDS="${DHMV_TIMEOUT_SECONDS:-300}"
+DHMV_MAX_RESPONSE_MB="${DHMV_MAX_RESPONSE_MB:-160}"
 YOLO_ENABLED="${YOLO_ENABLED:-false}"
 YOLO_MODELS_DIR="${YOLO_MODELS_DIR:-/app/models}"
 YOLO_MODEL_PATH="${YOLO_MODEL_PATH:-}"
@@ -103,6 +111,14 @@ docker run -d \
   -e ORTHOPHOTO_MIN_SIDE_M="$ORTHOPHOTO_MIN_SIDE_M" \
   -e ORTHOPHOTO_MAX_SIDE_M="$ORTHOPHOTO_MAX_SIDE_M" \
   -e ORTHOPHOTO_CACHE_TTL_HOURS="$ORTHOPHOTO_CACHE_TTL_HOURS" \
+  -e DHMV_ENABLED="$DHMV_ENABLED" \
+  -e DHMV_WCS_URL="$DHMV_WCS_URL" \
+  -e DHMV_RESOLUTION_M="$DHMV_RESOLUTION_M" \
+  -e DHMV_MIN_SIDE_M="$DHMV_MIN_SIDE_M" \
+  -e DHMV_MAX_SIDE_M="$DHMV_MAX_SIDE_M" \
+  -e DHMV_MAX_PIXELS="$DHMV_MAX_PIXELS" \
+  -e DHMV_TIMEOUT_SECONDS="$DHMV_TIMEOUT_SECONDS" \
+  -e DHMV_MAX_RESPONSE_MB="$DHMV_MAX_RESPONSE_MB" \
   -e YOLO_ENABLED="$YOLO_ENABLED" \
   -e YOLO_MODELS_DIR="$YOLO_MODELS_DIR" \
   -e YOLO_MODEL_PATH="$YOLO_MODEL_PATH" \

docker-compose.unraid.yml

@@ -25,6 +25,14 @@ services:
       ORTHOPHOTO_MIN_SIDE_M: ${ORTHOPHOTO_MIN_SIDE_M:-128}
       ORTHOPHOTO_MAX_SIDE_M: ${ORTHOPHOTO_MAX_SIDE_M:-1024}
       ORTHOPHOTO_CACHE_TTL_HOURS: ${ORTHOPHOTO_CACHE_TTL_HOURS:-24}
+      DHMV_ENABLED: ${DHMV_ENABLED:-true}
+      DHMV_WCS_URL: ${DHMV_WCS_URL:-https://geo.api.vlaanderen.be/DHMV/wcs}
+      DHMV_RESOLUTION_M: ${DHMV_RESOLUTION_M:-5.0}
+      DHMV_MIN_SIDE_M: ${DHMV_MIN_SIDE_M:-10}
+      DHMV_MAX_SIDE_M: ${DHMV_MAX_SIDE_M:-20000}
+      DHMV_MAX_PIXELS: ${DHMV_MAX_PIXELS:-12000000}
+      DHMV_TIMEOUT_SECONDS: ${DHMV_TIMEOUT_SECONDS:-300}
+      DHMV_MAX_RESPONSE_MB: ${DHMV_MAX_RESPONSE_MB:-160}
       YOLO_ENABLED: ${YOLO_ENABLED:-false}
       YOLO_MODELS_DIR: ${YOLO_MODELS_DIR:-/app/models}
       YOLO_MODEL_PATH: ${YOLO_MODEL_PATH:-}

docker-compose.yml

@@ -30,6 +30,14 @@ services:
       ORTHOPHOTO_MIN_SIDE_M: ${ORTHOPHOTO_MIN_SIDE_M:-128}
       ORTHOPHOTO_MAX_SIDE_M: ${ORTHOPHOTO_MAX_SIDE_M:-1024}
       ORTHOPHOTO_CACHE_TTL_HOURS: ${ORTHOPHOTO_CACHE_TTL_HOURS:-24}
+      DHMV_ENABLED: ${DHMV_ENABLED:-true}
+      DHMV_WCS_URL: ${DHMV_WCS_URL:-https://geo.api.vlaanderen.be/DHMV/wcs}
+      DHMV_RESOLUTION_M: ${DHMV_RESOLUTION_M:-5.0}
+      DHMV_MIN_SIDE_M: ${DHMV_MIN_SIDE_M:-10}
+      DHMV_MAX_SIDE_M: ${DHMV_MAX_SIDE_M:-20000}
+      DHMV_MAX_PIXELS: ${DHMV_MAX_PIXELS:-12000000}
+      DHMV_TIMEOUT_SECONDS: ${DHMV_TIMEOUT_SECONDS:-300}
+      DHMV_MAX_RESPONSE_MB: ${DHMV_MAX_RESPONSE_MB:-160}
       YOLO_ENABLED: ${YOLO_ENABLED:-false}
       YOLO_MODELS_DIR: ${YOLO_MODELS_DIR:-/app/models}
       YOLO_MODEL_PATH: ${YOLO_MODEL_PATH:-}

docs/API_CONTRACTS.md

@@ -219,6 +219,49 @@ dimensions, EPSG:4326/EPSG:31370 bounds, sampling resolution, attribution,
 cache reuse and limitation text. Historical products also persist their
 observation/validity period and a spatially scoped temporal-series key.
 
+### GET `/api/v1/projects/{project_id}/datasets/dhmv/products`
+
+Returns the fixed official DHMV II product registry in the canonical envelope.
+The registry contains only `dtm_1m` (`DHMVII_DTM_1m`) and `dsm_1m`
+(`DHMVII_DSM_1m`). Each item records native 1 m resolution, EPSG:31370, TAW,
+the 2013-2015 acquisition period, attribution, catalogue and limitations.
+
+### POST `/api/v1/projects/{project_id}/datasets/dhmv/acquire`
+
+Runs a bounded WCS 2.0.1 `GetCoverage` request behind the existing synchronous
+Job abstraction. Arbitrary coverage identifiers are rejected.
+
+```json
+{
+  "bbox": {"min_x": 5.0, "min_y": 51.1, "max_x": 5.2, "max_y": 51.3, "crs": "EPSG:4326"},
+  "area_id": "optional-project-area-uuid",
+  "product_key": "dtm_1m",
+  "resolution_m": 5.0,
+  "force_refresh": false
+}
+```
+
+The service extracts the GeoTIFF from the official multipart response, clips
+to the exact persisted Area when supplied, validates EPSG:31370, one band,
+resolution, nodata and valid cells, then persists through `DatasetService`.
+The default 5 m file is an analysis copy of the retained 1 m source product;
+both resolutions and all request/response/output checksums remain provenance.
+
+### POST `/api/v1/projects/{project_id}/datasets/{dataset_id}/raster/terrain/select`
+
+Accepts an EPSG:4326 rectangle and optional Area id. It reads only a governed,
+ready DHMV Dataset and returns a canonical envelope with valid-cell coverage,
+mean/min/max/P10/P90 height in `m TAW`, relief in metres and mean/P90/max slope
+in degrees. Area geometry is an exact mask, not only a bounding box.
+
+The response always lists `water_depth_m` and `water_volume_m3` under
+`unsupported_metrics`. Drainage is not calculated by this endpoint.
+
+### GET `/api/v1/projects/{project_id}/datasets/{dataset_id}/raster/terrain/image`
+
+Returns a browser-safe PNG colour relief for the persisted governed DHMV
+Dataset. This binary MapLibre source never accepts an arbitrary file path.
+
 Safety contract:
 
 - every side must measure between 128 m and 1,024 m in EPSG:31370;

docs/CODEX_EXECUTION_LOG.md

@@ -8684,3 +8684,36 @@ Next:
 - Implement P4 Digitaal Hoogtemodel Vlaanderen with a governed DTM/DSM product,
   vertical reference, bounded raster storage and measured elevation/slope
   statistics. Do not infer water depth or volume from terrain height alone.
+
+## Sprint 207 - Governed DHMV II terrain foundation (2026-07-15)
+
+Implemented:
+- Added a fixed `dtm_1m`/`dsm_1m` product registry for the official Digitaal
+  Vlaanderen production WCS and rejected arbitrary coverage identifiers.
+- Added bounded WCS scaling, multipart GeoTIFF extraction, exact persisted-Area
+  clipping and validation of EPSG:31370, one Float32 band, resolution, nodata
+  and valid cells before canonical DatasetService persistence.
+- Retained response, coverage and normalized-output SHA256 evidence plus native
+  1 m resolution, default 5 m analysis resolution, TAW and period 2013-2015.
+- Added exact masked terrain selection with governed height, relief and slope
+  metrics. DTM and DSM semantics remain separate; water depth/volume remain
+  explicit unsupported metrics and drainage is not calculated.
+- Added the `Hoogte & reliëf` map theme, MapLibre colour-relief overlay,
+  readable period/source labels and raster-aware rectangle/full-Area queries.
+- Added `scripts/provision_mol_dhmv.py`, Docker/Unraid settings and documentation.
+
+Initial validation:
+- Focused acquisition, raster, GIS metric, API, frontend and packaging tests
+  pass with deterministic synthetic GeoTIFF fixtures.
+- No migration, direct raster database write, LiDAR point-cloud processing or
+  water-volume inference was introduced.
+
+Known limitations:
+- DHMV II represents acquisition period 2013-2015 and is not a current or
+  annual height series. Exact flight-day contours are not yet joined.
+- The 5 m analysis copy is operationally bounded; sub-5 m detail requires an
+  explicit smaller acquisition. DSM-DTM building height remains future work.
+
+Next:
+- Complete the full readiness and live Mol operator/browser validation, then
+  audit P5 bathymetry sources before enabling any water depth or volume metric.

docs/DATA_SOURCES.md

@@ -220,9 +220,10 @@ until a governed operator import, provenance record and validation pass exist.
 - Buildings and Addresses Register (Digitaal Vlaanderen): continuously updated
   building status, life cycle and address linkage; complementary to GRB
   geometry and not yet imported.
-- DHMV II DTM/DSM (Digitaal Vlaanderen): 1 m/5 m elevation based on 2013-2015
+- DHMV II DTM/DSM (Digitaal Vlaanderen): governed bounded WCS acquisition is
-  LiDAR, suitable for elevation, slope and drainage. It does not provide water
+  implemented below. The official 1 m source and 5 m analysis copy are suitable
-  depth.
+  for measured elevation, relief and slope. Drainage remains an interpretation;
+  the products do not provide water depth.
 
 ## Governed BWK and Natura 2000 state 2025
 
@@ -322,10 +323,22 @@ quality metrics.
 
 - Naam: Digitaal Hoogtemodel Vlaanderen
 - Type: raster/hoogte
-- Gebruik: DEM, DSM, helling, laagste punten
+- Gebruik: DTM/DSM hoogte, reliëf, helling en laagste punten
-- Toegang: Vlaamse open data, download/WCS nader te bepalen
+- Toegang: productie-WCS `https://geo.api.vlaanderen.be/DHMV/wcs`
-- Cache: raster storage
+- Coverages: `DHMVII_DTM_1m`, `DHMVII_DSM_1m`
-- Prioriteit: V3
+- Native raster: 1 m Float32, EPSG:31370, nodata `-9999`, hoogte in TAW
+- Opnameperiode: 2013-2015; geen uniforme recente peildatum
+- Cache: canonical raster Dataset plus WCS request/response/output checksums
+- Operator: `scripts/provision_mol_dhmv.py`
+- Prioriteit: P4 uitgevoerd voor Mol
+
+The operator requests a bounded 5 m analysis copy by default so a complete
+municipality remains operationally manageable while retaining the official
+1 m native resolution in source metadata. The response is clipped to the exact
+persisted Area before `DatasetService` stores it. DTM is bare-earth terrain;
+DSM includes buildings and vegetation. Neither is exposed as water depth,
+water volume or a directly measured building-height product. A drainage model
+would require a separately governed hydrological processing pass.
 
 ## Gebouwenregister
 

docs/DATA_SPECIFICATION.md

@@ -159,12 +159,23 @@ Hoogtedata voor terrein- en watergevoeligheidsanalyse.
 
 ### Gebruik
 
-- DEM
+- DTM-maaiveldhoogte in meter TAW
-- DSM
+- DSM-oppervlaktehoogte in meter TAW
-- helling
+- reliëf en helling in graden uit geldige rastercellen
-- laagste punten
+- laagste punten als terreinindicator
-- hoogteprofiel
+- gebouwhoogte-inschatting alleen in een latere, gevalideerde DSM-DTM/gebouwketen
-- gebouwhoogte-inschatting indien DSM + gebouwpolygonen beschikbaar zijn
+
+### Governed product
+
+- Digitaal Vlaanderen DHMV II, DTM/DSM raster 1 m
+- WCS coverages `DHMVII_DTM_1m` en `DHMVII_DSM_1m`
+- EPSG:31370, Float32, nodata `-9999`, verticale referentie TAW
+- opnameperiode 2013-2015
+- standaard GeoIntel-analysekopie 5 m, exact geclipt op Area
+
+Waterdiepte, waterinhoud, actuele toestand en afstroming zijn geen directe
+DHMV-metingen. Zij blijven onbeschikbaar tot een afzonderlijke bron en
+gevalideerde methode bestaan.
 
 ### Type
 
@@ -172,7 +183,7 @@ Raster / afgeleid van LiDAR.
 
 ### Prioriteit
 
-V3.
+P4 operationeel voor Mol; regionale uitrol volgt dezelfde operatorgrenzen.
 
 ## LAS/LAZ LiDAR
 

docs/STORAGE_ARCHITECTURE.md

@@ -109,6 +109,15 @@ product/layer, request/spatial hash, temporal validity and limitations are held
 in source/provenance metadata. Browser PNG rendering is derived on request and
 does not replace the stored GeoTIFF.
 
+DHMV II DTM/DSM outputs are also normal raster Dataset files. The provider WCS
+returns multipart coverage data; GeoIntel retains response and extracted
+coverage SHA256 values in provenance, then stores one normalized, compressed,
+Area-clipped GeoTIFF with its ordinary Dataset/DatasetVersion checksum. Source
+metadata records the 1 m native product, 5 m default analysis grid, EPSG:31370,
+`-9999` nodata, TAW and acquisition period 2013-2015. Colour-relief PNGs are
+derived browser views and are never authoritative. No raster binary is stored
+in PostgreSQL and no DHMV file is treated as water depth or volume.
+
 BWK/Natura 2000 evidence lives under
 `storage/operator-evidence/bwk-natura2000-2025/mol/`. The `raw/` directory
 contains immutable WFS pages; the adjacent manifest records their URLs,

docs/TODO.md

@@ -60,10 +60,10 @@ pass live Mol validation before regional expansion.
 
 ### P4 - Digitaal Hoogtemodel Vlaanderen
 
-- [ ] Select official DTM/DSM product, service and native resolution; retain acquisition date and vertical reference.
+- [x] Select official DTM/DSM product, service and native resolution; retain acquisition date and vertical reference.
-- [ ] Add bounded raster acquisition/clip storage with nodata, CRS, resolution and checksum validation.
+- [x] Add bounded raster acquisition/clip storage with nodata, CRS, resolution and checksum validation.
-- [ ] Implement governed elevation, relief and slope statistics in metres/degrees; keep drainage interpretation explicitly derived.
+- [x] Implement governed elevation, relief and slope statistics in metres/degrees; keep drainage interpretation explicitly derived.
-- [ ] Do not label terrain/surface height as water depth and do not enable volume from DHMV alone.
+- [x] Do not label terrain/surface height as water depth and do not enable volume from DHMV alone.
 
 ### P5 - Water depth / bathymetry
 

frontend/README.md

@@ -492,6 +492,14 @@ another municipality or the complete Kempen scope falls back to the complete
 regional GRB building layer. This avoids presenting a Mol-only snapshot as
 regional coverage.
 
+When a governed DHMV Dataset is loaded, the Map explorer adds `Hoogte &
+reliëf`. The active 5 m analysis raster is rendered as a colour-relief
+MapLibre image over the ordinary OpenStreetMap context. A drawn rectangle or
+the exact selected Area returns measured DTM/DSM height, relief and slope with
+TAW and the 2013-2015 source period visible. Raster cells are not presented as
+objects. GeoJSON export is disabled for this raster-only result, and the UI
+explicitly states that water depth and volume cannot be derived from DHMV.
+
 ## Useful repository scripts
 
 - `bash scripts/frontend_install.sh`

frontend/src/App.tsx

@@ -182,7 +182,13 @@ function App(): JSX.Element {
   )
   const availableVectorDatasets = useMemo(() => datasets.filter((item) => isVectorDatasetType(item.dataset_type)), [datasets])
   const availableMapDatasets = useMemo(
-    () => datasets.filter((dataset) => isVectorDatasetType(dataset.dataset_type) && dataset.status === 'ready'),
+    () => {
+      const vectors = datasets.filter((dataset) => isVectorDatasetType(dataset.dataset_type) && dataset.status === 'ready')
+      const terrain = datasets.filter(
+        (dataset) => dataset.dataset_type === 'raster' && dataset.source_name === 'digitaal_vlaanderen_dhmv' && dataset.status === 'ready',
+      )
+      return [...vectors, ...terrain]
+    },
     [datasets],
   )
   const referenceDatasets = useMemo(
@@ -1023,7 +1029,7 @@ function App(): JSX.Element {
               orthophotoResult={mapOrthophotoAnalysis.lastResult}
               orthophotoImageUrl={mapOrthophotoAnalysis.imageUrl}
               availableMapDatasets={availableMapDatasets}
-              selectedMapDatasetId={selectedDataset && isVectorDatasetType(selectedDataset.dataset_type) ? selectedDataset.id : ''}
+              selectedMapDatasetId={selectedDataset && availableMapDatasets.some((dataset) => dataset.id === selectedDataset.id) ? selectedDataset.id : ''}
               selectedFeature={selectedMapFeature}
               onSelectMapArea={setSelectedMapAreaId}
               onOpenDatasetInMap={openDatasetInMap}

frontend/src/components/datasets/SourceCatalogPanel.tsx

@@ -12,6 +12,7 @@ const THEME_LABELS: Record<string, string> = {
   nature_value: 'Natuurwaarde',
   agriculture: 'Landbouw',
   water: 'Water',
+  elevation: 'Hoogte en reliëf',
   roads: 'Wegen en transport',
   parcels: 'Percelen',
 }
@@ -54,7 +55,7 @@ const AVAILABLE_SOURCES = [
     name: 'Digitaal Hoogtemodel Vlaanderen II',
     owner: 'Digitaal Vlaanderen',
     coverage: 'LiDAR-opname 2013-2015, DTM/DSM 1 m en 5 m',
-    value: 'Hoogte, reliëf, helling en afstroming; geen waterdiepte',
+    value: 'Hoogte, reliëf en helling; afstroming is afgeleid, geen waterdiepte',
     url: 'https://www.vlaanderen.be/digitaal-vlaanderen/onze-diensten-en-platformen/earth-observation-data-science-eodas/het-digitaal-hoogtemodel/digitaal-hoogtemodel-vlaanderen-ii',
   },
   {
@@ -111,6 +112,7 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
   const buildingsRegisterDatasets = ready.filter(
     (dataset) => dataset.source_name === 'digitaal_vlaanderen_buildings_addresses_register',
   )
+  const dhmvDatasets = ready.filter((dataset) => dataset.source_name === 'digitaal_vlaanderen_dhmv')
   const latestBuildingsRegister = [...buildingsRegisterDatasets].sort(
     (left, right) => new Date(right.observed_at ?? 0).getTime() - new Date(left.observed_at ?? 0).getTime(),
   )[0]
@@ -122,6 +124,7 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
     if (source.key === 'bwk') return bwkDatasets.length === 0
     if (source.key === 'agriculture') return agricultureDatasets.length === 0
     if (source.key === 'buildings_register') return buildingsRegisterDatasets.length === 0
+    if (source.key === 'elevation') return dhmvDatasets.length === 0
     return true
   })
   const themes = Object.keys(THEME_LABELS).map((theme) => {
@@ -181,7 +184,7 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
         ))}
       </div>
 
-      {waterinfoDatasets.length > 0 || historicalOrthophotos.length > 0 || bwkDatasets.length > 0 || agricultureDatasets.length > 0 || buildingsRegisterDatasets.length > 0 ? (
+      {waterinfoDatasets.length > 0 || historicalOrthophotos.length > 0 || bwkDatasets.length > 0 || agricultureDatasets.length > 0 || buildingsRegisterDatasets.length > 0 || dhmvDatasets.length > 0 ? (
         <div className="source-catalog-loaded" aria-label="Aanvullende ingeladen bronnen">
           {waterinfoDatasets.length > 0 ? (
             <article>
@@ -222,6 +225,13 @@ export function SourceCatalogPanel({ datasets }: SourceCatalogPanelProps): JSX.E
               <p>Registerstatus en geaggregeerde koppelingen voor Mol; adreslabels en persoonsgegevens worden niet in de kaartlaag getoond.</p>
             </article>
           ) : null}
+          {dhmvDatasets.length > 0 ? (
+            <article>
+              <strong>Digitaal Hoogtemodel Vlaanderen II</strong>
+              <span>{dhmvDatasets.length} rasterproducten · DTM/DSM · analyse op 5 m</span>
+              <p>Hoogte in TAW, reliëf en helling uit opnameperiode 2013-2015. Geen waterdiepte of watervolume.</p>
+            </article>
+          ) : null}
         </div>
       ) : null}
 

frontend/src/components/map/MapWorkspace.tsx

@@ -6,6 +6,7 @@ import { useMapThemeSelectionInsights } from '../../hooks/useMapThemeSelectionIn
 import { useTemporalComparison } from '../../hooks/useTemporalComparison'
 import { getDatasetDisplayName, getDatasetSourceDisplayName } from '../../lib/datasetDisplay'
 import { TemporalTrendChart } from './TemporalTrendChart'
+import { terrainImageUrl } from '../../lib/terrainImage'
 
 const DEFAULT_SELECTED_FEATURE_FILENAME = 'selected-feature.geojson'
 const DEFAULT_AREA_SELECTION_FILENAME = 'area-selection.geojson'
@@ -13,7 +14,7 @@ const EMPTY_TEMPORAL_SERIES: DatasetCreateResponse[] = []
 const MOL_PROJECT_NAME = 'Mol Municipality Workbench'
 const KEMPEN_PROJECT_NAME = 'Kempen Regional Workbench'
 
-type DataThemeId = 'buildings' | 'population' | 'forest' | 'nature_value' | 'agriculture' | 'water' | 'roads' | 'parcels'
+type DataThemeId = 'buildings' | 'population' | 'forest' | 'nature_value' | 'agriculture' | 'water' | 'elevation' | 'roads' | 'parcels'
 
 interface DataTheme {
   id: DataThemeId
@@ -72,6 +73,13 @@ const DATA_THEMES: DataTheme[] = [
     description: 'Waterlopen, grachten, kanalen en wateroppervlakken.',
     tokens: ['waterways', 'waterway', 'water', 'hydro', 'river', 'stream', 'canal', 'waterloop'],
   },
+  {
+    id: 'elevation',
+    label: 'Hoogte & reliëf',
+    shortLabel: 'Hoogte',
+    description: 'Maaiveld- of oppervlaktehoogte, reliëf en helling uit DHMV II.',
+    tokens: ['dhmv', 'elevation', 'height', 'hoogte', 'terrain', 'surface', 'dtm', 'dsm', 'reliëf'],
+  },
   {
     id: 'roads',
     label: 'Wegen',
@@ -95,10 +103,19 @@ const DATA_THEME_MAP_STYLES: Record<DataThemeId, { fill: string; line: string }>
   nature_value: { fill: '#9a4f64', line: '#74364a' },
   agriculture: { fill: '#7b8f32', line: '#53671d' },
   water: { fill: '#2676a8', line: '#155b85' },
+  elevation: { fill: '#a57a4b', line: '#315f59' },
   roads: { fill: '#6b7280', line: '#4b5563' },
   parcels: { fill: '#a7792f', line: '#7d571f' },
 }
 
+function datasetAvailabilityLabel(dataset: DatasetCreateResponse): string {
+  if (dataset.dataset_type === 'raster' && dataset.source_name === 'digitaal_vlaanderen_dhmv') {
+    const resolution = Number(dataset.source_metadata?.['analysis_resolution_m'])
+    return `${Number.isFinite(resolution) ? `${resolution.toLocaleString('nl-BE')} m` : 'Raster'} hoogtegrid beschikbaar`
+  }
+  return `${(dataset.feature_count ?? dataset.vector_summary?.feature_count ?? 0).toLocaleString('nl-BE')} objecten beschikbaar`
+}
+
 function datasetSearchText(dataset: DatasetCreateResponse): string {
   return [
     dataset.name,
@@ -144,6 +161,8 @@ function pickThemeDataset(
       (dataset.source_name === 'inbo_bwk_natura2000' ? 95_000 : 0) +
       (dataset.source_name === 'agentschap_landbouw_zeevisserij_agricultural_parcels' ? 98_000 : 0) +
       (dataset.source_name === 'digitaal_vlaanderen_buildings_addresses_register' ? 5_000_000 : 0) +
+      (dataset.source_name === 'digitaal_vlaanderen_dhmv' ? 5_000_000 : 0) +
+      (dataset.source_metadata?.['product_key'] === 'dtm_1m' ? 1_000_000 : 0) +
       (dataset.dataset_role === 'reference' ? 10_000 : 0) +
       (dataset.observed_at ? new Date(dataset.observed_at).getTime() / 100_000_000 : 0) +
       (dataset.feature_count ?? dataset.vector_summary?.feature_count ?? 0)
@@ -200,6 +219,14 @@ function formatObservationDate(value: string | null | undefined): string {
   return new Intl.DateTimeFormat('nl-BE', { year: 'numeric', month: 'short', day: 'numeric' }).format(new Date(value))
 }
 
+function formatDatasetObservation(dataset: DatasetCreateResponse): string {
+  const period = dataset.source_metadata?.['acquisition_period']
+  if (typeof period === 'string' && period.trim()) {
+    return `opnameperiode ${period}`
+  }
+  return formatObservationDate(dataset.observed_at)
+}
+
 function operationalScopeProjectLabel(project: ProjectRead): string {
   if (project.name === MOL_PROJECT_NAME) {
     return 'Mol'
@@ -668,6 +695,18 @@ export function MapWorkspace({
       }
     : null
   const activeThemeDataset = themeDatasetMap[activeTheme.id]
+  const terrainBounds = activeThemeDataset?.source_name === 'digitaal_vlaanderen_dhmv'
+    ? activeThemeDataset.source_metadata?.['bbox_epsg4326']
+    : null
+  const terrainImageOverlay = activeTheme.id === 'elevation' && activeThemeDataset && selectedProjectId && Array.isArray(terrainBounds) && terrainBounds.length === 4
+    ? {
+        url: terrainImageUrl(selectedProjectId, activeThemeDataset.id),
+        bbox: terrainBounds.map(Number) as [number, number, number, number],
+        label: getDatasetDisplayName(activeThemeDataset),
+        opacity: 0.82,
+      }
+    : null
+  const activeImageOverlay = terrainImageOverlay ?? orthophotoImageOverlay
   const activeScopeProject = projects.find((project) => project.id === selectedProjectId) ?? null
   const activeScopeLabel = activeScopeProject ? operationalScopeProjectLabel(activeScopeProject) : 'Werkgebied'
   const municipalityAreaCount = areas.filter((area) => /^Gemeente\s/i.test(area.name)).length
@@ -709,7 +748,10 @@ export function MapWorkspace({
   const activeSupportingMetrics = (activeSelectionResult?.summary?.metrics ?? []).filter(
     (metric) => metric.metric_key !== activeSelectionResult?.summary?.primary_metric_key,
   )
-  const activeSecondaryMetric = selectedAreaSquareMetres && selectedAreaSquareMetres > 0
+  const terrainReliefMetric = activeSupportingMetrics.find((metric) => metric.metric_key === 'relief_m')
+  const activeSecondaryMetric = activeMetricUnit === 'm TAW'
+    ? terrainReliefMetric ? `${terrainReliefMetric.metric_value.toLocaleString('nl-BE', { maximumFractionDigits: 2 })} m reliëf` : null
+    : selectedAreaSquareMetres && selectedAreaSquareMetres > 0
       ? activeMetricUnit === 'ha'
       ? `${((activeMetricValue * 10_000) / selectedAreaSquareMetres * 100).toLocaleString('nl-BE', { maximumFractionDigits: 1 })}% dekking`
       : `${(activeMetricValue / (selectedAreaSquareMetres / 1_000_000)).toLocaleString('nl-BE', { maximumFractionDigits: 1 })} ${activeMetricUnit} / km2`
@@ -1094,7 +1136,7 @@ export function MapWorkspace({
                               ? 'Alleen huidige toestand'
                               : 'Bron nog niet ingeladen'
                           : dataset
-                            ? `${(dataset.feature_count ?? dataset.vector_summary?.feature_count ?? 0).toLocaleString('nl-BE')} objecten beschikbaar`
+                            ? datasetAvailabilityLabel(dataset)
                             : 'Bron nog niet ingeladen'}
                       </small>
                     </span>
@@ -1125,7 +1167,7 @@ export function MapWorkspace({
                     ? `${activeTemporalSeries.length} officiële meetmomenten · ${formatObservationDate(activeTemporalSeries[0].observed_at)} tot ${formatObservationDate(activeTemporalSeries[activeTemporalSeries.length - 1].observed_at)}`
                     : 'Voor dit thema is nog geen tweede officieel meetmoment beschikbaar.'
                   : activeThemeDataset
-                    ? `${getDatasetSourceDisplayName(activeThemeDataset)} · ${formatObservationDate(activeThemeDataset.observed_at)}`
+                    ? `${getDatasetSourceDisplayName(activeThemeDataset)} · ${formatDatasetObservation(activeThemeDataset)}`
                     : activeTheme.description}
               </small>
             </div>
@@ -1225,7 +1267,7 @@ export function MapWorkspace({
                 areaData={areaFeatureCollection}
                 selectedFeature={selectedFeature}
                 selectionData={analysisMode === 'current' ? mapSelectionResult?.geojson ?? null : null}
-                imageOverlay={orthophotoImageOverlay}
+                imageOverlay={activeImageOverlay}
                 selectionBbox={mapSelectionBbox}
                 bboxSelectionMode={bboxSelectionMode}
                 visible={mapLayerVisible}
@@ -1241,7 +1283,7 @@ export function MapWorkspace({
               />
               <div className="geo-map-legend" aria-label="Kaartlegende">
                 <span><i className="geo-legend-area" /> Werkgebied</span>
-                {orthophotoImageOverlay ? <span><i className="geo-legend-imagery" /> {orthophotoImageOverlay.label}</span> : null}
+                {activeImageOverlay ? <span><i className="geo-legend-imagery" /> {activeImageOverlay.label}</span> : null}
                 {analysisOverlayActive ? (
                   <>
                     <span><i className="geo-legend-layer geo-legend-layer-buildings" /> AI-kandidaten</span>
@@ -1444,7 +1486,7 @@ export function MapWorkspace({
                         <strong>{activeSelectionResult ? resultMetricLabel(activeSelectionResult) : 'Geen resultaat'}</strong>
                       </div>
                       <div>
-                        <span>{activeMetricUnit === 'ha' ? 'Aandeel selectie' : 'Dichtheid'}</span>
+                        <span>{activeMetricUnit === 'ha' ? 'Aandeel selectie' : activeMetricUnit === 'm TAW' ? 'Reliëf' : 'Dichtheid'}</span>
                         <strong>{activeSecondaryMetric ?? (selectedDensity === null ? 'n.v.t.' : `${selectedDensity.toLocaleString('nl-BE', { maximumFractionDigits: 1 })} / km2`)}</strong>
                       </div>
                     </div>
@@ -1517,7 +1559,7 @@ export function MapWorkspace({
 
                 {analysisMode === 'current' ? (
                   <div className="geo-result-actions">
-                    <button className="secondary-action" disabled={!activeSelectionResult} type="button" onClick={downloadActiveThemeSelection}>Download GeoJSON</button>
+                    <button className="secondary-action" disabled={!activeSelectionResult || activeTheme.id === 'elevation'} type="button" onClick={downloadActiveThemeSelection}>Download GeoJSON</button>
                     <button className="secondary-action" disabled={!activeSelectionResult} type="button" onClick={copyActiveThemeSelection}>Kopieer gegevens</button>
                   </div>
                 ) : null}

frontend/src/hooks/useMapSelectionExtract.ts

@@ -2,6 +2,7 @@ import { useEffect, useRef, useState } from 'react'
 import { datasetsApi } from '../services/api'
 import { formatError } from '../lib/formatError'
 import type { DatasetCreateResponse, VectorSelectionBBox, VectorSelectionResponse } from '../types'
+import { terrainSelectionToMapSelection } from '../lib/terrainSelection'
 
 interface MapSelectionExtractOptions {
   selectedProjectId: string | null
@@ -38,8 +39,9 @@ export function useMapSelectionExtract({
       setMapSelectionError('Open a vector dataset before extracting a map area.')
       return null
     }
-    if (!isVectorDatasetType(selectedDataset.dataset_type)) {
+    const terrainDataset = selectedDataset.dataset_type === 'raster' && selectedDataset.source_name === 'digitaal_vlaanderen_dhmv'
-      setMapSelectionError('Area extraction requires an active vector dataset.')
+    if (!isVectorDatasetType(selectedDataset.dataset_type) && !terrainDataset) {
+      setMapSelectionError('Gebiedsanalyse ondersteunt een vectorlaag of een beheerd DHMV-hoogtemodel.')
       return null
     }
 
@@ -49,7 +51,12 @@ export function useMapSelectionExtract({
     setMapSelectionError(null)
     setMapSelectionBbox(bbox)
     try {
-      const response = await datasetsApi.selectVectorFeatures(selectedProjectId, selectedDataset.id, {
+      const response = terrainDataset
+        ? terrainSelectionToMapSelection(await datasetsApi.selectTerrain(selectedProjectId, selectedDataset.id, {
+            bbox: { ...bbox, crs: 'EPSG:4326' },
+            area_id: areaId,
+          }))
+        : await datasetsApi.selectVectorFeatures(selectedProjectId, selectedDataset.id, {
             bbox: { ...bbox, crs: 'EPSG:4326' },
             area_id: areaId,
             limit: 1000,

frontend/src/hooks/useMapThemeSelectionInsights.ts

@@ -2,6 +2,7 @@ import { useEffect, useRef, useState } from 'react'
 import { formatError } from '../lib/formatError'
 import { datasetsApi } from '../services/api/datasets'
 import type { DatasetCreateResponse, VectorSelectionBBox, VectorSelectionResponse } from '../types'
+import { terrainSelectionToMapSelection } from '../lib/terrainSelection'
 
 export interface MapThemeQuery<TThemeId extends string> {
   themeId: TThemeId
@@ -54,7 +55,12 @@ export function useMapThemeSelectionInsights<TThemeId extends string>(
         queries.map(async ({ themeId, dataset }) => ({
           themeId,
           dataset,
-          result: await datasetsApi.selectVectorFeatures(selectedProjectId, dataset.id, {
+          result: dataset.dataset_type === 'raster' && dataset.source_name === 'digitaal_vlaanderen_dhmv'
+            ? terrainSelectionToMapSelection(await datasetsApi.selectTerrain(selectedProjectId, dataset.id, {
+                bbox,
+                area_id: areaId,
+              }))
+            : await datasetsApi.selectVectorFeatures(selectedProjectId, dataset.id, {
                 bbox,
                 area_id: areaId,
                 limit: 1000,

frontend/src/lib/datasetDisplay.ts

@@ -9,6 +9,7 @@ const DATASET_LABEL_BY_LAYER: Record<string, string> = {
   forest: 'Bos en groen',
   nature_value: 'Natuurwaarde',
   agriculture: 'Landbouwgebruikspercelen',
+  elevation: 'Hoogte en reliëf',
   building_registry: 'Gebouwenregister',
   regional_boundary: 'Grens vervoerregio Kempen',
   municipality_boundaries: 'Gemeentegrenzen Kempen',
@@ -19,6 +20,7 @@ const DATASET_SOURCE_LABELS: Record<string, string> = {
   agentschap_landbouw_zeevisserij_agricultural_parcels: 'Agentschap Landbouw en Zeevisserij',
   digitaal_vlaanderen_orthophoto: 'Digitaal Vlaanderen',
   digitaal_vlaanderen_buildings_addresses_register: 'Digitaal Vlaanderen',
+  digitaal_vlaanderen_dhmv: 'Digitaal Vlaanderen',
   grb: 'GRB',
   historical_landuse: 'Digitaal Vlaanderen',
   inbo_bwk_natura2000: 'INBO',
@@ -33,6 +35,10 @@ export function getDatasetSourceDisplayName(dataset: DatasetCreateResponse): str
 }
 
 export function getDatasetDisplayName(dataset: DatasetCreateResponse): string {
+  if (dataset.source_name === 'digitaal_vlaanderen_dhmv') {
+    const productName = dataset.source_metadata?.['product_display_name']
+    return typeof productName === 'string' && productName.trim() ? productName : 'DHMV II hoogtemodel'
+  }
   const layer = (dataset.reference_layer_name ?? dataset.source_metadata?.layer_name ?? dataset.source_metadata?.layer_type ?? '')
     .toString()
     .toLowerCase()

frontend/src/lib/terrainImage.ts

@@ -0,0 +1,3 @@
+export function terrainImageUrl(projectId: string, datasetId: string): string {
+  return `/api/v1/projects/${projectId}/datasets/${datasetId}/raster/terrain/image`
+}

frontend/src/lib/terrainSelection.ts

@@ -0,0 +1,23 @@
+import type { TerrainSelectionResponse, VectorSelectionResponse } from '../types'
+
+export function terrainSelectionToMapSelection(result: TerrainSelectionResponse): VectorSelectionResponse {
+  return {
+    selection_bbox: result.selection_bbox,
+    selection_area_id: result.selection_area_id,
+    feature_count: 0,
+    total_feature_count: 0,
+    limit: 0,
+    truncated: false,
+    geojson: { type: 'FeatureCollection', features: [] },
+    summary: {
+      ...result.summary,
+      feature_count: result.sample_count,
+      is_estimate: false,
+      warning: result.limitation_message,
+      metrics: result.summary.metrics.map((metric) => ({
+        ...metric,
+        is_estimate: false,
+      })),
+    },
+  }
+}

frontend/src/services/api/datasets.ts

@@ -18,6 +18,9 @@ import type {
   RasterNdbiRequest,
   OrthophotoAcquireRequest,
   OrthophotoProductRead,
+  DhmvAcquireRequest,
+  DhmvProductRead,
+  TerrainSelectionResponse,
 } from '../../types'
 
 const DATASET_PAGE_SIZE = 200
@@ -115,6 +118,16 @@ export const datasetsApi = {
     apiGet<{ items: OrthophotoProductRead[]; total: number }>(`/api/v1/projects/${projectId}/datasets/orthophoto/products`),
   orthophotoImageUrl: (projectId: string, datasetId: string): string =>
     `/api/v1/projects/${projectId}/datasets/${datasetId}/raster/image`,
+  acquireDhmv: (projectId: string, payload: DhmvAcquireRequest): Promise<JobRead> =>
+    apiPost<JobRead>(`/api/v1/projects/${projectId}/datasets/dhmv/acquire`, payload),
+  listDhmvProducts: (projectId: string): Promise<{ items: DhmvProductRead[]; total: number }> =>
+    apiGet<{ items: DhmvProductRead[]; total: number }>(`/api/v1/projects/${projectId}/datasets/dhmv/products`),
+  selectTerrain: (
+    projectId: string,
+    datasetId: string,
+    payload: { bbox: VectorSelectionRequest['bbox']; area_id?: string },
+  ): Promise<TerrainSelectionResponse> =>
+    apiPost<TerrainSelectionResponse>(`/api/v1/projects/${projectId}/datasets/${datasetId}/raster/terrain/select`, payload),
   refreshMetadata: (projectId: string, datasetId: string): Promise<DatasetCreateResponse> =>
     apiPost<DatasetCreateResponse>(`/api/v1/projects/${projectId}/datasets/${datasetId}/metadata/refresh`, {}),
   inspectRaster: (projectId: string, datasetId: string): Promise<RasterInspectResponse> =>

frontend/src/styles/app.css

@@ -5756,6 +5756,7 @@ section {
 .geo-theme-symbol-nature_value { background: #9a4f64; }
 .geo-theme-symbol-agriculture { background: #7b8f32; }
 .geo-theme-symbol-water { background: #2676a8; }
+.geo-theme-symbol-elevation { background: #a57a4b; }
 .geo-theme-symbol-roads { background: #6b7280; }
 .geo-theme-symbol-parcels { background: #a7792f; }
 
@@ -5940,6 +5941,11 @@ section {
   background: rgba(38, 118, 168, 0.24);
 }
 
+.geo-map-legend .geo-legend-layer-elevation {
+  border-color: #315f59;
+  background: rgba(165, 122, 75, 0.26);
+}
+
 .geo-map-legend .geo-legend-layer-roads {
   border-color: #4b5563;
   background: rgba(107, 114, 128, 0.24);

frontend/src/types.ts

@@ -336,6 +336,52 @@ export interface OrthophotoAcquisitionResult {
   limitation_message: string
 }
 
+export interface DhmvAcquireRequest {
+  bbox: VectorSelectionBBox
+  area_id?: string | null
+  product_key?: 'dtm_1m' | 'dsm_1m'
+  resolution_m?: number | null
+  force_refresh?: boolean
+}
+
+export interface DhmvProductRead {
+  key: 'dtm_1m' | 'dsm_1m'
+  display_name: string
+  surface_model: 'terrain' | 'surface'
+  coverage_id: string
+  native_resolution_m: number
+  source_crs: string
+  vertical_reference: string
+  acquisition_period: string
+  catalog_url: string
+  attribution: string
+  limitation_message: string
+}
+
+export interface TerrainSelectionResponse {
+  dataset_id: string
+  product_key: string
+  surface_model: 'terrain' | 'surface'
+  selection_bbox: VectorSelectionBBox
+  selection_area_id?: string | null
+  sample_count: number
+  slope_sample_count: number
+  coverage_ratio: number
+  resolution_m: number
+  vertical_reference: string
+  summary: {
+    metric_label: string
+    metric_value: number
+    metric_unit: string
+    aggregation_method: string
+    primary_metric_key: string
+    metrics: VectorSelectionMetric[]
+  }
+  unsupported_metrics: string[]
+  limitation_message: string
+  generated_at: string
+}
+
 export interface MapImageOverlay {
   url: string
   bbox: [number, number, number, number]

scripts/README.md

@@ -1513,6 +1513,31 @@ Only aggregate unit/address counts enter the queryable building layer. Review
 manifest before accepting a broader import. Raw address response pages are
 operator evidence and must not be published.
 
+## Mol DHMV terrain rasters
+
+Acquire and validate the official DHMV II DTM and DSM for the exact persisted
+Mol Area:
+
+```bash
+docker exec geointel python /app/scripts/provision_mol_dhmv.py
+```
+
+The operator resolves project and Area through the API, derives the bounded
+EPSG:4326 request rectangle and calls the canonical DHMV endpoints. The backend
+requests the fixed official WCS coverages, extracts multipart GeoTIFF, clips to
+the exact Area, validates EPSG:31370/resolution/nodata/valid cells and stores
+through DatasetService. It then runs a full-Area terrain metric smoke.
+
+Useful safe overrides:
+
+```bash
+docker exec geointel python /app/scripts/provision_mol_dhmv.py --products dtm_1m
+docker exec geointel python /app/scripts/provision_mol_dhmv.py --resolution-m 5 --force
+```
+
+Do not use DHMV output as water depth or water volume. The command fails when
+the API no longer reports those metrics as explicitly unsupported.
+
 ## Tower deployment
 
 Push the local branch to Gitea, then rebuild the Unraid/Tower Docker runtime:

scripts/provision_mol_dhmv.py

@@ -0,0 +1,157 @@
+"""Provision governed DHMV II terrain/surface rasters for the persisted Mol Area.
+
+The operator calls the canonical GeoIntel DHMV acquisition API. The backend
+performs the bounded official WCS request, exact Area clipping, validation,
+checksum storage and Dataset/Job persistence. No raster rows are written
+directly by this script.
+"""
+
+from __future__ import annotations
+
+import argparse
+import json
+import os
+from typing import Any, Iterable
+
+import requests
+
+
+DEFAULT_API_URL = "http://127.0.0.1:8000"
+DEFAULT_PROJECT_NAME = "Kempen Regional Workbench"
+DEFAULT_AREA_FRAGMENT = "Gemeente Mol"
+PRODUCTS = ("dtm_1m", "dsm_1m")
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(description="Provision official DHMV II DTM/DSM rasters for Mol.")
+    parser.add_argument("--base-url", default=os.environ.get("GEOINTEL_INTERNAL_API_URL", DEFAULT_API_URL))
+    parser.add_argument("--project-name", default=DEFAULT_PROJECT_NAME)
+    parser.add_argument("--area-name", default=DEFAULT_AREA_FRAGMENT)
+    parser.add_argument("--products", default=",".join(PRODUCTS), help="Comma-separated governed product keys.")
+    parser.add_argument("--resolution-m", type=float, default=5.0)
+    parser.add_argument("--timeout", type=int, default=1800)
+    parser.add_argument("--force", action="store_true")
+    return parser.parse_args()
+
+
+def unwrap(response: requests.Response) -> Any:
+    response.raise_for_status()
+    payload = response.json()
+    if not isinstance(payload, dict) or "data" not in payload:
+        raise RuntimeError(f"Non-canonical API response from {response.url}")
+    return payload["data"]
+
+
+def coordinates(geometry: dict[str, Any]) -> Iterable[tuple[float, float]]:
+    def walk(value: Any):
+        if isinstance(value, list) and len(value) >= 2 and all(isinstance(item, (int, float)) for item in value[:2]):
+            yield float(value[0]), float(value[1])
+            return
+        if isinstance(value, list):
+            for child in value:
+                yield from walk(child)
+
+    yield from walk(geometry.get("coordinates", []))
+
+
+def geometry_bbox(geometry: dict[str, Any]) -> dict[str, float | str]:
+    points = list(coordinates(geometry))
+    if not points:
+        raise RuntimeError("Persisted Area geometry contains no coordinates")
+    xs = [point[0] for point in points]
+    ys = [point[1] for point in points]
+    return {
+        "min_x": min(xs),
+        "min_y": min(ys),
+        "max_x": max(xs),
+        "max_y": max(ys),
+        "crs": "EPSG:4326",
+    }
+
+
+def main() -> int:
+    args = parse_args()
+    base_url = args.base_url.rstrip("/")
+    session = requests.Session()
+    session.headers.update({"User-Agent": "GeoIntel-DHMV-Operator/1.0"})
+
+    projects = unwrap(session.get(f"{base_url}/api/v1/projects", params={"limit": 200, "offset": 0}, timeout=60))["items"]
+    project = next((item for item in projects if item["name"] == args.project_name), None)
+    if project is None:
+        raise RuntimeError(f"Project {args.project_name!r} was not found")
+
+    areas = unwrap(
+        session.get(
+            f"{base_url}/api/v1/projects/{project['id']}/areas",
+            params={"limit": 200, "offset": 0},
+            timeout=60,
+        )
+    )["items"]
+    fragment = args.area_name.casefold()
+    area = next((item for item in areas if fragment in item["name"].casefold()), None)
+    if area is None:
+        raise RuntimeError(f"Area containing {args.area_name!r} was not found")
+    bbox = geometry_bbox(area["geometry"])
+
+    requested_products = [item.strip() for item in args.products.split(",") if item.strip()]
+    invalid = sorted(set(requested_products) - set(PRODUCTS))
+    if invalid:
+        raise RuntimeError(f"Unsupported DHMV product keys: {', '.join(invalid)}")
+
+    results = []
+    for product_key in requested_products:
+        job = unwrap(
+            session.post(
+                f"{base_url}/api/v1/projects/{project['id']}/datasets/dhmv/acquire",
+                json={
+                    "bbox": bbox,
+                    "area_id": area["id"],
+                    "product_key": product_key,
+                    "resolution_m": args.resolution_m,
+                    "force_refresh": args.force,
+                },
+                timeout=args.timeout,
+            )
+        )
+        if job.get("status") != "success" or not job.get("output_dataset_id"):
+            raise RuntimeError(f"DHMV acquisition failed for {product_key}: {job.get('error_message') or job}")
+        analysis = unwrap(
+            session.post(
+                f"{base_url}/api/v1/projects/{project['id']}/datasets/{job['output_dataset_id']}/raster/terrain/select",
+                json={"bbox": bbox, "area_id": area["id"]},
+                timeout=args.timeout,
+            )
+        )
+        if sorted(analysis.get("unsupported_metrics", [])) != ["water_depth_m", "water_volume_m3"]:
+            raise RuntimeError("DHMV terrain contract must explicitly keep water depth and volume unavailable")
+        results.append(
+            {
+                "product_key": product_key,
+                "dataset_id": job["output_dataset_id"],
+                "reused": bool((job.get("result_json") or {}).get("reused")),
+                "resolution_m": analysis["resolution_m"],
+                "sample_count": analysis["sample_count"],
+                "coverage_ratio": analysis["coverage_ratio"],
+                "metrics": analysis["summary"]["metrics"],
+            }
+        )
+
+    print(
+        json.dumps(
+            {
+                "status": "ok",
+                "project_id": project["id"],
+                "area_id": area["id"],
+                "area_name": area["name"],
+                "bbox": bbox,
+                "products": results,
+            },
+            ensure_ascii=False,
+            indent=2,
+        )
+    )
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

scripts/run_readiness_check.sh

@@ -51,6 +51,7 @@ ${PYTHON_BIN} -m py_compile scripts/provision_waterinfo_station_history.py
 ${PYTHON_BIN} -m py_compile scripts/provision_mol_bwk_natura2000.py
 ${PYTHON_BIN} -m py_compile scripts/provision_agricultural_parcel_history.py
 ${PYTHON_BIN} -m py_compile scripts/provision_buildings_addresses_register.py
+${PYTHON_BIN} -m py_compile scripts/provision_mol_dhmv.py
 ${PYTHON_BIN} -m py_compile scripts/provision_regional_timeseries.py
 ${PYTHON_BIN} -m py_compile scripts/geographic_scopes.py
 ${PYTHON_BIN} -m py_compile scripts/provision_geographic_scope.py