Add governed DHMV terrain analysis

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: