fix(map): honor raster coverage and temporal dates

backend/app/services/temporal_analysis_service.py

@@ -32,6 +32,37 @@ class TemporalAnalysisService:
         "provision_regional_grb_context.py",
     }
 
+    @staticmethod
+    def _canonical_observation_snapshots(datasets: list[Dataset]) -> list[Dataset]:
+        by_observation: dict[datetime, Dataset] = {}
+        for dataset in datasets:
+            if dataset.observed_at is None:
+                continue
+            current = by_observation.get(dataset.observed_at)
+            dataset_recency = max(
+                (
+                    value.timestamp()
+                    for value in (dataset.imported_at, dataset.updated_at, dataset.created_at)
+                    if value is not None
+                ),
+                default=0.0,
+            )
+            current_recency = max(
+                (
+                    value.timestamp()
+                    for value in (
+                        getattr(current, "imported_at", None),
+                        getattr(current, "updated_at", None),
+                        getattr(current, "created_at", None),
+                    )
+                    if value is not None
+                ),
+                default=0.0,
+            )
+            if current is None or (dataset_recency, str(dataset.id)) > (current_recency, str(current.id)):
+                by_observation[dataset.observed_at] = dataset
+        return sorted(by_observation.values(), key=lambda item: item.observed_at)
+
     @staticmethod
     def list_series(db: Session, project_id: UUID) -> list[TemporalSeriesRead]:
         rows = (
@@ -49,6 +80,7 @@ class TemporalAnalysisService:
 
         result: list[TemporalSeriesRead] = []
         for key, datasets in grouped.items():
+            datasets = TemporalAnalysisService._canonical_observation_snapshots(datasets)
             observed = [item.observed_at for item in datasets if item.observed_at is not None]
             if not observed:
                 continue
@@ -118,6 +150,13 @@ class TemporalAnalysisService:
                 bbox,
                 selection_area.geometry,
             )
+
+        def is_preclipped_to_selection_area(dataset: Dataset) -> bool:
+            return bool(
+                selection_area
+                and VectorFeatureService.can_use_full_area_fast_path(dataset, selection_area.id)
+            )
+
         summaries: dict[UUID, dict[str, Any]] = {}
 
         def summarize(dataset: Dataset) -> dict[str, Any]:
@@ -126,14 +165,9 @@ class TemporalAnalysisService:
                 return cached
             kwargs: dict[str, Any] = {"dataset": dataset, "bbox": bbox}
             if selection_area is not None:
-                kwargs["selection_geometry"] = selection_geometry
-                kwargs["full_dataset_area"] = (
-                    selection_covers_full_area
-                    and VectorFeatureService.can_use_full_area_fast_path(
-                        dataset,
-                        selection_area.id,
-                    )
-                )
+                dataset_is_preclipped = is_preclipped_to_selection_area(dataset)
+                kwargs["selection_geometry"] = None if dataset_is_preclipped else selection_geometry
+                kwargs["full_dataset_area"] = selection_covers_full_area and dataset_is_preclipped
             summary = VectorFeatureService.summarize_features_by_bbox(db, **kwargs)
             summaries[dataset.id] = summary
             return summary
@@ -164,16 +198,20 @@ class TemporalAnalysisService:
             later=later,
             bbox=bbox,
             preview_limit=payload.preview_limit,
-            selection_geometry=selection_geometry,
+            selection_geometry=(
+                None
+                if is_preclipped_to_selection_area(earlier) and is_preclipped_to_selection_area(later)
+                else selection_geometry
+            ),
             earlier_full_dataset_area=(
                 selection_covers_full_area
-                and VectorFeatureService.can_use_full_area_fast_path(earlier, selection_area.id)
+                and is_preclipped_to_selection_area(earlier)
                 if selection_area is not None
                 else False
             ),
             later_full_dataset_area=(
                 selection_covers_full_area
-                and VectorFeatureService.can_use_full_area_fast_path(later, selection_area.id)
+                and is_preclipped_to_selection_area(later)
                 if selection_area is not None
                 else False
             ),
@@ -298,8 +336,7 @@ class TemporalAnalysisService:
             )
         else:
             datasets = fallback_datasets
-        unique = {dataset.id: dataset for dataset in datasets}
-        ordered = sorted(unique.values(), key=lambda item: item.observed_at or datetime.min.replace(tzinfo=timezone.utc))
+        ordered = TemporalAnalysisService._canonical_observation_snapshots(datasets)
         observations: list[TemporalObservation] = []
         for dataset in ordered:
             if dataset.observed_at is None:

backend/tests/test_sprint187_temporal_map_foundation.py

@@ -133,6 +133,20 @@ def temporal_dataset(*, project_id, observed_year: int, metric_method: str = "fe
     )
 
 
+def test_temporal_series_keeps_only_latest_snapshot_per_observation_date() -> None:
+    project_id = uuid4()
+    old = temporal_dataset(project_id=project_id, observed_year=2025)
+    old.imported_at = datetime(2026, 7, 19, tzinfo=timezone.utc)
+    latest = temporal_dataset(project_id=project_id, observed_year=2025)
+    latest.imported_at = datetime(2026, 7, 21, tzinfo=timezone.utc)
+    earlier = temporal_dataset(project_id=project_id, observed_year=2022)
+    earlier.imported_at = datetime(2026, 7, 21, tzinfo=timezone.utc)
+
+    canonical = TemporalAnalysisService._canonical_observation_snapshots([old, latest, earlier])
+
+    assert [dataset.id for dataset in canonical] == [earlier.id, latest.id]
+
+
 def governed_grb_dataset(*, project_id, observed_day: int) -> Dataset:
     dataset = temporal_dataset(project_id=project_id, observed_year=2026, metric_method="intersection_area")
     dataset.observed_at = datetime(2026, 7, observed_day, tzinfo=timezone.utc)

backend/tests/test_sprint237_flanders_thematic_on_demand.py

@@ -16,7 +16,7 @@ def test_flanders_workspace_exposes_governed_thematic_products_on_demand() -> No
 
     assert "activeScopeProject?.name === FLANDERS_WORKSPACE_PROJECT_NAME" in workspace
     assert "new Map<DataThemeId, OnDemandMapProduct>" in workspace
-    assert "'Op aanvraag'" in workspace
+    assert "'Automatisch'" in workspace
     assert "theme.id === 'space_occupation'" in workspace
     assert "setActiveThemeId(fallbackTheme.id)" in workspace
     assert "return `referentiejaar ${observationYear}`" in workspace

backend/tests/test_sprint239_bounded_grb_acquisition.py

@@ -391,6 +391,6 @@ def test_grb_frontend_and_contracts_use_only_the_governed_backend_path() -> None
     assert "result[product.key] = null" in workspace
     assert ": onDemandThemeActive\n        ? null\n        : mapFeatureCollection" in workspace
     assert "onSetContextLayerLabel" in workspace
-    assert "'Op aanvraag'" in workspace
+    assert "'Automatisch'" in workspace
     assert "/datasets/grb/acquire" in contracts
     assert "geo.api.vlaanderen.be" not in workspace

docs/DATA_COVERAGE_STATUS.md

@@ -0,0 +1,74 @@
+# GeoIntel data coverage status
+
+Status date: 2026-07-21
+
+This document is the operational interpretation of the source registry. It
+does not replace the legal/source provenance stored with each Dataset.
+
+## Status labels in the workbench
+
+- `Beschikbaar`: a persisted Dataset covers the selection and can be queried
+  immediately.
+- `Automatisch`: an audited official source contract exists. GeoIntel obtains
+  and persists only the bounded selection when analysis starts.
+- `Alleen huidig`: one official observation exists, so no honest evolution can
+  be calculated.
+- `Ontbreekt`: no operational source contract covers that theme and zone.
+
+`Automatisch` therefore does not mean unavailable or simulated. It means that
+the source is materialized on first use and reused afterwards. AI training
+cannot replace missing official GIS observations and is not used to fabricate
+coverage or historical dates.
+
+## Current operational coverage
+
+| Zone | Persisted or bounded operational sources | Historical comparison |
+| --- | --- | --- |
+| Belgium | NGI administrative boundaries; Statbel population/statistical sectors | Statbel population 2021-2025 |
+| Flanders | GRB buildings, roads, water and parcels; DHMV terrain/surface; VMM flood scenarios; BWK/Natura 2000; DOV soil; policy rasters for space, open space, accessibility and services; agriculture and orthophoto where governed | Population 2021-2025; land-use/land-cover series where retained; agriculture editions; historical maps/orthophotos where the selected product has a real observation date |
+| Wallonia | Bounded PICC buildings, roads and hydrography; governed SPW bed-elevation/bathymetry products | No general cross-theme regional history yet |
+| Brussels | Bounded UrbIS buildings, street axes and cadastral parcels | No general cross-theme regional history yet |
+| Belgian North Sea | RBINS reporting units; Marine Spatial Plan 2026-2034; governed MDK bathymetry only when runtime acquisition is explicitly configured | No multi-epoch bathymetry or marine-plan trend yet |
+
+Mol and the Kempen are golden regression areas. Their persisted partitions are
+not national coverage. A partition is only selected when its recorded
+`bbox_epsg4326` intersects the drawn rectangle; otherwise GeoIntel uses an
+applicable bounded official source or reports the theme as unsupported.
+
+## Priority coverage gaps
+
+1. Govern the public Walloon WALOUS land-cover editions (including the
+   published 2018/2020 change product) as a real regional time series. A class
+   crosswalk is required because the older COSW 2005/2007 methodology differs.
+   Official catalogue:
+   `https://geoportail.wallonie.be/catalogue-donnees?search-text=occupation+du+sol`.
+2. Govern the current public Walloon flood-hazard vector/raster products and
+   retain their model scenario semantics separately from observed floods.
+   Official record:
+   `https://geoportail.wallonie.be/catalogue/14084108-2c7b-4091-b62d-ff0fc235213a.html`.
+3. Add the public UrbIS Land Cover product (regional situation 2024) for
+   Brussels through its official WFS/download contract. Keep it separate from
+   cadastral parcels and buildings. Product specification:
+   `https://urbisdownload.datastore.brussels/UrbIS/TechSpec/LandCover_TechSpec_FR20240401.pdf`.
+4. Add a common Belgium-wide topographic baseline with normalized theme
+   semantics across NGI, Flanders, Wallonia and Brussels.
+5. Govern comparable Walloon and Brussels historical editions before exposing
+   evolution for buildings, roads, land cover, soil, elevation or flood risk.
+6. Add nationally comparable land-cover history with explicit class crosswalks
+   and uncertainty; never compare incompatible legends silently.
+7. Add multi-epoch marine bathymetry and survey-footprint metadata before
+   presenting seabed evolution.
+8. Expand persisted raster partition manifests beyond the regression regions
+   only where repeated use justifies caching; bounded acquisition remains the
+   default for one-off selections.
+9. Add source freshness probes only for publishers with stable official edition
+   contracts. Do not infer a new observation from an import or HTTP date.
+
+## Acceptance rules for a new source
+
+A source is visible as operational only after its licence, authority,
+observation time, CRS, spatial coverage, schema, units and limitations are
+validated. It must persist through DatasetService and the canonical feature or
+raster flow, retain provenance/checksums, return semantic metrics, and have a
+selection-level regression test. Historical support additionally requires at
+least two distinct, methodologically comparable official observation dates.

frontend/src/components/map/MapWorkspace.tsx

@@ -21,6 +21,8 @@ import {
   bboxToInputState,
   bboxesEqual,
   copyText,
+  datasetIntersectsSelection,
+  deduplicateTemporalSnapshots,
   downloadJsonFile,
   formatArea,
   formatBboxLabel,
@@ -571,13 +573,11 @@ function listThemeTemporalSeries(datasets: DatasetCreateResponse[], theme: DataT
     groups.set(dataset.temporal_series_key, items)
   }
   return Array.from(groups.entries())
-    .filter(([, items]) => items.length >= 2)
     .map(([key, items]) => {
-      const ordered = [...items].sort(
-        (left, right) => new Date(left.observed_at ?? 0).getTime() - new Date(right.observed_at ?? 0).getTime(),
-      )
+      const ordered = deduplicateTemporalSnapshots(items)
       return { key, label: temporalSeriesLabel(ordered), items: ordered }
     })
+    .filter((group) => group.items.length >= 2)
     .sort((left, right) => {
       if (right.items.length !== left.items.length) {
         return right.items.length - left.items.length
@@ -1048,7 +1048,7 @@ export function MapWorkspace({
           productKey: product.key,
           displayName: product.display_name,
           theme: product.theme,
-          availabilityLabel: `${product.native_resolution_m} m · ${product.observation_year} · laad bij selectie`,
+          availabilityLabel: `${product.native_resolution_m} m · ${product.observation_year} · automatisch bij selectie`,
           attribution: product.attribution,
           limitationMessage: product.limitation_message,
         })
@@ -1059,7 +1059,7 @@ export function MapWorkspace({
           productKey: product.key,
           displayName: product.display_name,
           theme: product.key,
-          availabilityLabel: 'officiële vectorbron · laad bij selectie',
+          availabilityLabel: 'officiële vectorbron · automatisch bij selectie',
           attribution: product.attribution,
           limitationMessage: product.limitation_message,
         })
@@ -1075,7 +1075,7 @@ export function MapWorkspace({
           productKey: source.key,
           displayName: source.display_name,
           theme: 'bathymetry',
-          availabilityLabel: 'historische profielpunten · laad bij selectie',
+          availabilityLabel: 'historische profielpunten · automatisch bij selectie',
           attribution: source.attribution,
           limitationMessage: source.limitation_message,
         })
@@ -1089,7 +1089,7 @@ export function MapWorkspace({
         productKey: product.key,
         displayName: product.display_name,
         theme: product.theme,
-        availabilityLabel: `${product.observation_label} · officiële vectorbron · laad bij selectie`,
+        availabilityLabel: `${product.observation_label} · officiële vectorbron · automatisch bij selectie`,
         attribution: product.attribution,
         limitationMessage: product.limitation_message,
       })
@@ -1103,7 +1103,7 @@ export function MapWorkspace({
         productKey: dhmvProduct.key,
         displayName: dhmvProduct.display_name,
         theme: 'elevation',
-        availabilityLabel: `${dhmvProduct.native_resolution_m} m · ${dhmvProduct.acquisition_period} · laad bij selectie`,
+        availabilityLabel: `${dhmvProduct.native_resolution_m} m · ${dhmvProduct.acquisition_period} · automatisch bij selectie`,
         attribution: dhmvProduct.attribution,
         limitationMessage: dhmvProduct.limitation_message,
       })
@@ -1119,7 +1119,7 @@ export function MapWorkspace({
         productKey: floodProduct.key,
         displayName: floodProduct.display_name,
         theme: 'flood_hazard',
-        availabilityLabel: `${floodProduct.native_resolution_m} m · ${floodProduct.climate_context} · T${floodProduct.return_period_years} · laad bij selectie`,
+        availabilityLabel: `${floodProduct.native_resolution_m} m · ${floodProduct.climate_context} · T${floodProduct.return_period_years} · automatisch bij selectie`,
         attribution: floodProduct.attribution,
         limitationMessage: floodProduct.limitation_message,
       })
@@ -1329,6 +1329,19 @@ export function MapWorkspace({
   const activeTemporalSeriesGroup = activeTemporalSeriesGroups.find((group) => group.key === selectedTemporalSeriesKey)
     ?? activeTemporalSeriesGroups[0]
   const activeTemporalSeries = activeTemporalSeriesGroup?.items ?? EMPTY_TEMPORAL_SERIES
+  const earlierTemporalOptions = activeTemporalSeries.slice(0, -1)
+  const selectedEarlierSnapshot = activeTemporalSeries.find((dataset) => dataset.id === earlierDatasetId)
+  const selectedLaterSnapshot = activeTemporalSeries.find((dataset) => dataset.id === laterDatasetId)
+  const selectedEarlierTime = new Date(selectedEarlierSnapshot?.observed_at ?? 0).getTime()
+  const laterTemporalOptions = activeTemporalSeries.filter(
+    (dataset) => new Date(dataset.observed_at ?? 0).getTime() > selectedEarlierTime,
+  )
+  const temporalSelectionValid = Boolean(
+    selectedEarlierSnapshot
+    && selectedLaterSnapshot
+    && selectedEarlierSnapshot.id !== selectedLaterSnapshot.id
+    && selectedEarlierTime < new Date(selectedLaterSnapshot.observed_at ?? 0).getTime(),
+  )
   const activeSeriesIsDailyGrb = activeTemporalSeries.length >= 2
     && activeTemporalSeries.every((dataset) => dataset.source_name === 'grb')
     && new Date(activeTemporalSeries[activeTemporalSeries.length - 1].observed_at ?? 0).getTime()
@@ -1378,7 +1391,7 @@ export function MapWorkspace({
             activeSelectionResult.total_feature_count
             ?? activeSelectionResult.feature_count
           ).toLocaleString('nl-BE')} objecten gemeten`
-        : 'Op aanvraag'
+        : 'Automatisch bij selectie'
       : null
     onSetContextLayerLabel(contextLayerLabel)
     return () => onSetContextLayerLabel(null)
@@ -1841,13 +1854,26 @@ export function MapWorkspace({
     const resultFeatureLimit = selectionFeatureLimit(bbox)
     for (const theme of DATA_THEMES) {
       const dataset = themeDatasetMap[theme.id]
-      if (dataset && persistedDatasetSupportsSelection(dataset, bbox)) {
+      const partitioned = Boolean(
+        dataset
+        && regionalScopeSelected
+        && (isPartitionedRaster(dataset) || isPartitionedBathymetry(dataset)),
+      )
+      const coveringPartitions = partitioned
+        ? themePartitionMap[theme.id].filter((partition) => datasetIntersectsSelection(partition, bbox))
+        : []
+      const persistedCoverageAvailable = Boolean(
+        dataset
+        && persistedDatasetSupportsSelection(dataset, bbox)
+        && (!partitioned || coveringPartitions.length > 0),
+      )
+      if (dataset && persistedCoverageAvailable) {
         availableThemes.push({
           themeId: theme.id,
           dataset,
+          datasetIds: coveringPartitions.map((partition) => partition.id),
           featureLimit: resultFeatureLimit,
-          partitioned: regionalScopeSelected
-            && (isPartitionedRaster(dataset) || isPartitionedBathymetry(dataset)),
+          partitioned,
         })
         continue
       }
@@ -1877,16 +1903,20 @@ export function MapWorkspace({
     const startedAt = Date.now()
     setMapAnalysisDurationMs(null)
     setSelectionBbox(bbox)
-    const tasks: Array<Promise<unknown>> = [loadAllThemeResults(bbox, areaId)]
+    const tasks: Array<Promise<unknown>> = analysisMode === 'current'
+      ? [loadAllThemeResults(bbox, areaId)]
+      : []
     const activeDatasetSupportsSelection = !activeThemeDataset
       || persistedDatasetSupportsSelection(activeThemeDataset, bbox)
     if (
-      activeThemeAvailable && !regionalPartitionedThemeActive && !onDemandThemeActive
+      analysisMode === 'current'
+      && advancedMode
+      && activeThemeAvailable && !regionalPartitionedThemeActive && !onDemandThemeActive
       && activeDatasetSupportsSelection
     ) {
       tasks.push(onRunMapSelectionExtract(bbox, areaId))
     }
-    if (analysisMode === 'evolution' && earlierDatasetId && laterDatasetId) {
+    if (analysisMode === 'evolution' && temporalSelectionValid) {
       tasks.push(compareTemporalSnapshots(earlierDatasetId, laterDatasetId, bbox, areaId))
     }
     try {
@@ -1899,7 +1929,7 @@ export function MapWorkspace({
   }
 
   const runTemporalComparison = () => {
-    if (!mapSelectionBbox || !earlierDatasetId || !laterDatasetId) {
+    if (!mapSelectionBbox || !temporalSelectionValid) {
       return
     }
     void compareTemporalSnapshots(
@@ -2127,7 +2157,7 @@ export function MapWorkspace({
                               ? 'Alleen huidige toestand'
                               : 'Bron nog niet ingeladen'
                           : dataset
-                            ? datasetAvailabilityLabel(dataset, partitions)
+                            ? `${datasetAvailabilityLabel(dataset, partitions)}${onDemandProduct ? ' · zo nodig automatisch aangevuld' : ''}`
                             : onDemandProduct
                               ? onDemandProduct.availabilityLabel
                             : 'Bron nog niet ingeladen'}
@@ -2138,7 +2168,7 @@ export function MapWorkspace({
                         ? 'Laden'
                         : analysisMode === 'evolution'
                         ? evolutionAvailable ? 'Tijdreeks' : dataset ? 'Alleen huidig' : 'Ontbreekt'
-                        : dataset ? 'Beschikbaar' : onDemandProduct ? 'Op aanvraag' : 'Ontbreekt'}
+                        : dataset ? 'Beschikbaar' : onDemandProduct ? 'Automatisch' : 'Ontbreekt'}
                     </i>
                   </button>
                 )
@@ -2172,7 +2202,7 @@ export function MapWorkspace({
                   : regionalBathymetryThemeActive
                     ? `${activeThemePartitions.length} gecontroleerde gemeentepartities · selectie wordt ruimtelijk samengevoegd`
                   : activeThemeDataset
-                    ? `${getDatasetSourceDisplayName(activeThemeDataset)} · ${formatDatasetObservation(activeThemeDataset)}`
+                    ? `${getDatasetSourceDisplayName(activeThemeDataset)} · ${formatDatasetObservation(activeThemeDataset)}${onDemandProductMap.get(activeTheme.id) ? ' · ontbrekende lokale dekking wordt automatisch aangevuld' : ''}`
                     : activeOnDemandMapProduct
                       ? `${activeOnDemandMapProduct.attribution} · wordt alleen voor de gekozen selectie ingeladen`
                     : activeTheme.description}
@@ -2286,16 +2316,32 @@ export function MapWorkspace({
                   ) : null}
                   <label>
                     Van
-                    <select value={earlierDatasetId} onChange={(event) => { setEarlierDatasetId(event.target.value); clearTemporalComparison() }} disabled={activeTemporalSeries.length < 2}>
-                      {activeTemporalSeries.map((dataset) => (
+                    <select
+                      value={earlierDatasetId}
+                      onChange={(event) => {
+                        const nextEarlierId = event.target.value
+                        const nextEarlier = activeTemporalSeries.find((dataset) => dataset.id === nextEarlierId)
+                        setEarlierDatasetId(nextEarlierId)
+                        if (
+                          nextEarlier
+                          && new Date(selectedLaterSnapshot?.observed_at ?? 0).getTime()
+                            <= new Date(nextEarlier.observed_at ?? 0).getTime()
+                        ) {
+                          setLaterDatasetId(activeTemporalSeries[activeTemporalSeries.length - 1]?.id ?? '')
+                        }
+                        clearTemporalComparison()
+                      }}
+                      disabled={earlierTemporalOptions.length === 0}
+                    >
+                      {earlierTemporalOptions.map((dataset) => (
                         <option key={dataset.id} value={dataset.id}>{formatObservationDate(dataset.observed_at)}</option>
                       ))}
                     </select>
                   </label>
                   <label>
                     Naar
-                    <select value={laterDatasetId} onChange={(event) => { setLaterDatasetId(event.target.value); clearTemporalComparison() }} disabled={activeTemporalSeries.length < 2}>
-                      {activeTemporalSeries.map((dataset) => (
+                    <select value={laterDatasetId} onChange={(event) => { setLaterDatasetId(event.target.value); clearTemporalComparison() }} disabled={laterTemporalOptions.length === 0}>
+                      {laterTemporalOptions.map((dataset) => (
                         <option key={dataset.id} value={dataset.id}>{formatObservationDate(dataset.observed_at)}</option>
                       ))}
                     </select>
@@ -2303,7 +2349,7 @@ export function MapWorkspace({
                   <button
                     className="primary-action"
                     type="button"
-                    disabled={!mapSelectionBbox || !earlierDatasetId || !laterDatasetId || temporalComparisonLoading}
+                    disabled={!mapSelectionBbox || !temporalSelectionValid || temporalComparisonLoading}
                     onClick={runTemporalComparison}
                   >
                     {temporalComparisonLoading ? 'Vergelijken…' : 'Vergelijk periode'}

frontend/src/components/map/mapWorkspaceUtils.test.ts

@@ -1,6 +1,8 @@
 import { describe, expect, it } from 'vitest'
 import {
   bboxesEqual,
+  datasetIntersectsSelection,
+  deduplicateTemporalSnapshots,
   isMunicipalityAreaName,
   isSelectionBoundedDataset,
   normalizeBboxFromCorners,
@@ -160,4 +162,31 @@ describe('map workspace selection guards', () => {
     expect(selectionFeatureLimit(overview)).toBe(25)
     expect(selectionFeatureLimit({ ...overview, min_x: 5, max_x: 5.1, min_y: 51, max_y: 51.1 })).toBe(1000)
   })
+
+  it('uses persisted raster partitions only where their recorded bounds overlap', () => {
+    const molPartition = { source_metadata: { bbox_epsg4326: [5.03, 51.15, 5.24, 51.32] } }
+    expect(datasetIntersectsSelection(molPartition, {
+      min_x: 5.08,
+      min_y: 51.17,
+      max_x: 5.12,
+      max_y: 51.2,
+      crs: 'EPSG:4326',
+    })).toBe(true)
+    expect(datasetIntersectsSelection(molPartition, {
+      min_x: 4.3,
+      min_y: 50.8,
+      max_x: 4.4,
+      max_y: 50.9,
+      crs: 'EPSG:4326',
+    })).toBe(false)
+  })
+
+  it('counts one canonical temporal snapshot per official observation date', () => {
+    const snapshots = deduplicateTemporalSnapshots([
+      { id: 'old-2025', observed_at: '2025-12-31T23:59:59Z', imported_at: '2026-07-19T00:00:00Z' },
+      { id: 'new-2025', observed_at: '2025-12-31T23:59:59Z', imported_at: '2026-07-21T00:00:00Z' },
+      { id: 'year-2022', observed_at: '2022-12-31T23:59:59Z', imported_at: '2026-07-21T00:00:00Z' },
+    ])
+    expect(snapshots.map((dataset) => dataset.id)).toEqual(['year-2022', 'new-2025'])
+  })
 })

frontend/src/components/map/mapWorkspaceUtils.ts

@@ -117,6 +117,49 @@ export function persistedDatasetSupportsSelection(
   return scale === 'detail'
 }
 
+export function datasetIntersectsSelection(
+  dataset: { source_metadata?: Record<string, unknown> | null },
+  bbox: VectorSelectionBBox,
+): boolean {
+  const bounds = dataset.source_metadata?.['bbox_epsg4326']
+  if (!Array.isArray(bounds) || bounds.length !== 4) {
+    return true
+  }
+  const [minX, minY, maxX, maxY] = bounds.map(Number)
+  if (![minX, minY, maxX, maxY].every(Number.isFinite)) {
+    return true
+  }
+  return !(
+    bbox.max_x < minX
+    || bbox.min_x > maxX
+    || bbox.max_y < minY
+    || bbox.min_y > maxY
+  )
+}
+
+export function deduplicateTemporalSnapshots<
+  T extends {
+    id: string
+    observed_at?: string | null
+    imported_at?: string | null
+    created_at?: string | null
+  },
+>(datasets: T[]): T[] {
+  const byObservation = new Map<string, T>()
+  for (const dataset of datasets) {
+    if (!dataset.observed_at) continue
+    const current = byObservation.get(dataset.observed_at)
+    const recency = new Date(dataset.imported_at ?? dataset.created_at ?? 0).getTime()
+    const currentRecency = new Date(current?.imported_at ?? current?.created_at ?? 0).getTime()
+    if (!current || recency > currentRecency || (recency === currentRecency && dataset.id > current.id)) {
+      byObservation.set(dataset.observed_at, dataset)
+    }
+  }
+  return Array.from(byObservation.values()).sort(
+    (left, right) => new Date(left.observed_at ?? 0).getTime() - new Date(right.observed_at ?? 0).getTime(),
+  )
+}
+
 export function selectionFeatureLimit(bbox: VectorSelectionBBox): number {
   const scale = selectionAnalysisScale(bbox)
   if (scale === 'overview') return 25

frontend/src/hooks/useMapThemeSelectionInsights.ts

@@ -24,6 +24,7 @@ export interface MapThemeAcquisition {
 export interface MapThemeQuery<TThemeId extends string> {
   themeId: TThemeId
   dataset?: DatasetCreateResponse
+  datasetIds?: string[]
   partitioned?: boolean
   acquisition?: MapThemeAcquisition
   acquisitionBboxes?: VectorSelectionBBox[]
@@ -102,10 +103,11 @@ export function useMapThemeSelectionInsights<TThemeId extends string>(
     setThemeInsightsLoading(true)
     setThemeInsightsError(null)
     try {
+      const queryOrder = new Map(queries.map((query, index) => [query.themeId, index]))
       const settled = await settleWithConcurrency(
         queries,
         3,
-        async ({ themeId, dataset: existingDataset, partitioned, acquisition, acquisitionBboxes, featureLimit }) => {
+        async ({ themeId, dataset: existingDataset, datasetIds, partitioned, acquisition, acquisitionBboxes, featureLimit }) => {
           let dataset = existingDataset
           let acquiredDatasets: DatasetCreateResponse[] = []
           const resultLimit = featureLimit ?? 1000
@@ -162,20 +164,16 @@ export function useMapThemeSelectionInsights<TThemeId extends string>(
             throw new Error(`Geen persistente databron beschikbaar voor thema ${themeId}.`)
           }
           const acquiredDatasetIds = acquiredDatasets.map((item) => item.id)
+          const selectedDatasetIds = acquiredDatasetIds.length > 0 ? acquiredDatasetIds : datasetIds ?? []
           const acquiredAsPartitions = acquiredDatasetIds.length > 1
-          return {
-            themeId,
-            dataset,
-            partitioned,
-            acquisition,
-            result: dataset.dataset_type === 'raster' && dataset.source_name === 'digitaal_vlaanderen_dhmv'
+          const result = dataset.dataset_type === 'raster' && dataset.source_name === 'digitaal_vlaanderen_dhmv'
             ? terrainSelectionToMapSelection(
                 partitioned || acquiredAsPartitions
                   ? await datasetsApi.selectTerrainPartitions(selectedProjectId, {
                       bbox,
                       area_id: areaId,
                       product_key: String(dataset.source_metadata?.['product_key'] ?? 'dtm_1m'),
-                      ...(acquiredAsPartitions ? { dataset_ids: acquiredDatasetIds } : {}),
+                      ...(selectedDatasetIds.length > 0 ? { dataset_ids: selectedDatasetIds } : {}),
                     })
                   : await datasetsApi.selectTerrain(selectedProjectId, dataset.id, {
                       bbox,
@@ -189,7 +187,7 @@ export function useMapThemeSelectionInsights<TThemeId extends string>(
                         bbox,
                         area_id: areaId,
                         product_key: String(dataset.source_metadata?.['product_key'] ?? 'pluviaal_current_t100'),
-                        ...(acquiredAsPartitions ? { dataset_ids: acquiredDatasetIds } : {}),
+                        ...(selectedDatasetIds.length > 0 ? { dataset_ids: selectedDatasetIds } : {}),
                       })
                     : await datasetsApi.selectFloodHazard(selectedProjectId, dataset.id, {
                         bbox,
@@ -206,9 +204,9 @@ export function useMapThemeSelectionInsights<TThemeId extends string>(
                       bbox,
                       area_id: areaId,
                     }))
-            : acquiredAsPartitions && dataset.dataset_type !== 'raster'
+                  : selectedDatasetIds.length > 1 && dataset.dataset_type !== 'raster'
                     ? await datasetsApi.selectVectorFeaturePartitions(selectedProjectId, {
-                  dataset_ids: acquiredDatasetIds,
+                        dataset_ids: selectedDatasetIds,
                         bbox,
                         area_id: areaId,
                         limit: resultLimit,
@@ -223,8 +221,23 @@ export function useMapThemeSelectionInsights<TThemeId extends string>(
                           bbox,
                           area_id: areaId,
                           limit: resultLimit,
-              }),
+                        })
+          const insight: MapThemeInsight<TThemeId> = {
+            themeId,
+            dataset,
+            partitioned,
+            acquisition,
+            result,
           }
+          if (requestSequence.current === sequence) {
+            setThemeInsights((current) => (
+              [...current.filter((item) => item.themeId !== themeId), insight]
+                .sort(
+                  (left, right) => (queryOrder.get(left.themeId) ?? 0) - (queryOrder.get(right.themeId) ?? 0),
+                )
+            ))
+          }
+          return insight
         },
       )
       const successful = settled.flatMap((item) => (item.status === 'fulfilled' ? [item.value] : []))