Keep map selections within active areas

frontend/README.md

@@ -528,6 +528,12 @@ combined cell statistics. A monolithic full-region 5 m calculation remains
 disabled because it exceeds the governed raster-cell limit; users draw a
 bounded rectangle without first choosing a municipality.
 
+Every selection entry path forwards the active Area id. This includes dragged
+and coordinate rectangles, manual bbox input, temporal comparison, saving a
+derived selection Dataset and the advanced GIS workflow. Backend geometry
+intersection therefore remains the authority for the municipality or regional
+boundary even when a rectangle extends beyond it.
+
 ## Useful repository scripts
 
 - `bash scripts/frontend_install.sh`

frontend/src/components/map/MapWorkspace.tsx

@@ -676,7 +676,7 @@ interface MapWorkspaceProps {
   onRunMapSelectionExtract: (bbox: VectorSelectionBBox, areaId?: string) => Promise<VectorSelectionResponse | null>
   onClearMapSelectionExtract: () => void
   onExportMapSelection: (bbox: VectorSelectionBBox) => Promise<unknown>
-  onDeriveMapSelectionDataset: (bbox: VectorSelectionBBox) => Promise<DatasetCreateResponse | null>
+  onDeriveMapSelectionDataset: (bbox: VectorSelectionBBox, areaId?: string) => Promise<DatasetCreateResponse | null>
   onSelectMapQaReferenceDataset: (datasetId: string) => void
   onRunMapSelectionQa: (candidateDataset?: DatasetCreateResponse | null) => Promise<QaComparisonResult | null>
   onOpenMapSelectionQualityEvidence: () => void
@@ -1123,7 +1123,7 @@ export function MapWorkspace({
     setSelectionBbox(bbox)
     setFirstSelectionCorner(null)
     setBboxSelectionMode(false)
-    void analyzeSelection(bbox)
+    void analyzeSelection(bbox, selectedMapArea?.id)
   }
 
   const runAreaExtract = () => {
@@ -1131,7 +1131,7 @@ export function MapWorkspace({
     if (!bbox) {
       return
     }
-    void analyzeSelection(bbox)
+    void analyzeSelection(bbox, selectedMapArea?.id)
   }
 
   const clearAreaSelection = () => {
@@ -1183,7 +1183,7 @@ export function MapWorkspace({
     if (!bbox) {
       return
     }
-    onDeriveMapSelectionDataset(bbox)
+    onDeriveMapSelectionDataset(bbox, selectedMapArea?.id)
   }
 
   const openSelectedDatabaseLayer = (datasetId: string) => {
@@ -1251,8 +1251,7 @@ export function MapWorkspace({
     if (!mapSelectionBbox || !earlierDatasetId || !laterDatasetId) {
       return
     }
-    const areaId = selectedAreaBbox && bboxesEqual(mapSelectionBbox, selectedAreaBbox) ? selectedMapAreaId : undefined
-    void compareTemporalSnapshots(earlierDatasetId, laterDatasetId, mapSelectionBbox, areaId)
+    void compareTemporalSnapshots(earlierDatasetId, laterDatasetId, mapSelectionBbox, selectedMapArea?.id)
   }
 
   const handleMapBboxPreview = (bbox: VectorSelectionBBox) => {
@@ -1262,7 +1261,7 @@ export function MapWorkspace({
   const handleMapBboxSelect = (bbox: VectorSelectionBBox) => {
     setFirstSelectionCorner(null)
     setBboxSelectionMode(false)
-    void analyzeSelection(bbox)
+    void analyzeSelection(bbox, selectedMapArea?.id)
   }
 
   const runQuickAoiExtract = () => {
@@ -1271,7 +1270,7 @@ export function MapWorkspace({
       return
     }
     setSelectionBbox(bbox)
-    void analyzeSelection(bbox, selectedAreaBbox ? selectedMapArea?.id : undefined)
+    void analyzeSelection(bbox, selectedMapArea?.id)
   }
 
   const runFullGisWorkflow = async () => {
@@ -1310,7 +1309,7 @@ export function MapWorkspace({
     try {
       setFullWorkflowStatus('1/4 Querying persisted vector_features...')
       setSelectionBbox(bbox)
-      const selection = await onRunMapSelectionExtract(bbox)
+      const selection = await onRunMapSelectionExtract(bbox, selectedMapArea?.id)
       if (!selection) {
         setFullWorkflowError('Persisted vector query did not complete.')
         setFullWorkflowStatus('Stopped at query.')
@@ -1318,7 +1317,7 @@ export function MapWorkspace({
       }
 
       setFullWorkflowStatus('2/4 Saving derived result dataset...')
-      const derived = await onDeriveMapSelectionDataset(bbox)
+      const derived = await onDeriveMapSelectionDataset(bbox, selectedMapArea?.id)
       if (!derived) {
         setFullWorkflowError('Derived result dataset was not created.')
         setFullWorkflowStatus('Stopped at dataset save.')

frontend/src/hooks/useMapSelectionDataset.ts

@@ -24,7 +24,7 @@ export function useMapSelectionDataset({
   const [selectionDatasetError, setSelectionDatasetError] = useState<string | null>(null)
   const [latestSelectionDataset, setLatestSelectionDataset] = useState<DatasetCreateResponse | null>(null)
 
-  const deriveMapSelectionDataset = async (bbox: VectorSelectionBBox) => {
+  const deriveMapSelectionDataset = async (bbox: VectorSelectionBBox, areaId?: string) => {
     if (!selectedProjectId || !selectedDataset || !isVectorDatasetType(selectedDataset.dataset_type)) {
       setSelectionDatasetError('Select a vector dataset before saving the area as a dataset.')
       return null
@@ -34,6 +34,7 @@ export function useMapSelectionDataset({
     try {
       const derived = await datasetsApi.deriveVectorSelection(selectedProjectId, selectedDataset.id, {
         bbox: { ...bbox, crs: 'EPSG:4326' },
+        area_id: areaId,
         limit: 250,
         output_name: `${selectedDataset.name.replace(/\.(geo)?json$/i, '')}-selection-dataset`,
       })