feat: add official modern Mol land-use series

frontend/README.md

@@ -10,6 +10,10 @@ current, while `Evolution` lets the operator compare an earlier and later
 snapshot from the same series over a drawn rectangle. Results show units,
 absolute/percentage change, estimate status and source limitations.
 Added/removed/modified overlays only appear for stable source identities.
+When a theme has multiple valid methodologies, a compact series selector keeps
+them explicit. Forest therefore defaults to the official modern 2013-2025
+10 m series, while the separate 1778-1969 historical map series remains
+selectable and is never merged into the same trend.
 
 Selection results use dataset-specific PostGIS summaries. Object layers show
 intersecting counts, population shows inhabitants with partial-sector

frontend/src/components/map/MapWorkspace.tsx

@@ -7,6 +7,7 @@ import { useTemporalComparison } from '../../hooks/useTemporalComparison'
 
 const DEFAULT_SELECTED_FEATURE_FILENAME = 'selected-feature.geojson'
 const DEFAULT_AREA_SELECTION_FILENAME = 'area-selection.geojson'
+const EMPTY_TEMPORAL_SERIES: DatasetCreateResponse[] = []
 
 type DataThemeId = 'buildings' | 'population' | 'forest' | 'water' | 'roads' | 'parcels'
 
@@ -18,6 +19,12 @@ interface DataTheme {
   tokens: string[]
 }
 
+interface TemporalSeriesGroup {
+  key: string
+  label: string
+  items: DatasetCreateResponse[]
+}
+
 const DATA_THEMES: DataTheme[] = [
   {
     id: 'buildings',
@@ -90,6 +97,7 @@ function pickThemeDataset(datasets: DatasetCreateResponse[], theme: DataTheme):
     const score = (dataset: DatasetCreateResponse) =>
       (dataset.reference_layer_name && theme.tokens.includes(dataset.reference_layer_name.toLowerCase()) ? 1_000_000 : 0) +
       (dataset.source_name === 'grb' ? 100_000 : 0) +
+      (dataset.source_name === 'department_omgeving_land_use' ? 90_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)
@@ -98,7 +106,21 @@ function pickThemeDataset(datasets: DatasetCreateResponse[], theme: DataTheme):
   return candidates[0] ?? null
 }
 
-function pickThemeTemporalSeries(datasets: DatasetCreateResponse[], theme: DataTheme): DatasetCreateResponse[] {
+function temporalSeriesLabel(items: DatasetCreateResponse[]): string {
+  const configuredLabel = items.find((item) => typeof item.source_metadata?.['temporal_series_label'] === 'string')
+    ?.source_metadata?.['temporal_series_label']
+  if (typeof configuredLabel === 'string' && configuredLabel.trim()) {
+    return configuredLabel
+  }
+  const first = items[0]
+  const source = first?.source_name ?? first?.source ?? 'Tijdreeks'
+  const firstYear = first?.observed_at ? new Date(first.observed_at).getUTCFullYear() : null
+  const last = items[items.length - 1]
+  const lastYear = last?.observed_at ? new Date(last.observed_at).getUTCFullYear() : null
+  return firstYear && lastYear ? `${source} (${firstYear}-${lastYear})` : source
+}
+
+function listThemeTemporalSeries(datasets: DatasetCreateResponse[], theme: DataTheme): TemporalSeriesGroup[] {
   const groups = new Map<string, DatasetCreateResponse[]>()
   for (const dataset of datasets) {
     if (!datasetMatchesTheme(dataset, theme) || !dataset.temporal_series_key || !dataset.observed_at) {
@@ -108,16 +130,21 @@ function pickThemeTemporalSeries(datasets: DatasetCreateResponse[], theme: DataT
     items.push(dataset)
     groups.set(dataset.temporal_series_key, items)
   }
-  return Array.from(groups.values())
-    .filter((items) => items.length >= 2)
+  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(),
+      )
+      return { key, label: temporalSeriesLabel(ordered), items: ordered }
+    })
     .sort((left, right) => {
-      if (right.length !== left.length) {
-        return right.length - left.length
+      if (right.items.length !== left.items.length) {
+        return right.items.length - left.items.length
       }
-      const latest = (items: DatasetCreateResponse[]) => Math.max(...items.map((item) => new Date(item.observed_at ?? 0).getTime()))
+      const latest = (group: TemporalSeriesGroup) => Math.max(...group.items.map((item) => new Date(item.observed_at ?? 0).getTime()))
       return latest(right) - latest(left)
-    })[0]
-    ?.sort((left, right) => new Date(left.observed_at ?? 0).getTime() - new Date(right.observed_at ?? 0).getTime()) ?? []
+    })
 }
 
 function formatObservationDate(value: string | null | undefined): string {
@@ -496,6 +523,7 @@ export function MapWorkspace({
     clearTemporalComparison,
   } = useTemporalComparison(selectedProjectId)
   const [analysisMode, setAnalysisMode] = useState<'current' | 'evolution'>('current')
+  const [selectedTemporalSeriesKey, setSelectedTemporalSeriesKey] = useState('')
   const [earlierDatasetId, setEarlierDatasetId] = useState('')
   const [laterDatasetId, setLaterDatasetId] = useState('')
   const [bboxSelectionMode, setBboxSelectionMode] = useState(false)
@@ -536,10 +564,13 @@ export function MapWorkspace({
   )
   const activeTheme = DATA_THEMES.find((theme) => theme.id === activeThemeId) ?? DATA_THEMES[0]
   const activeThemeDataset = themeDatasetMap[activeTheme.id]
-  const activeTemporalSeries = useMemo(
-    () => pickThemeTemporalSeries(availableMapDatasets, activeTheme),
+  const activeTemporalSeriesGroups = useMemo(
+    () => listThemeTemporalSeries(availableMapDatasets, activeTheme),
     [activeTheme, availableMapDatasets],
   )
+  const activeTemporalSeriesGroup = activeTemporalSeriesGroups.find((group) => group.key === selectedTemporalSeriesKey)
+    ?? activeTemporalSeriesGroups[0]
+  const activeTemporalSeries = activeTemporalSeriesGroup?.items ?? EMPTY_TEMPORAL_SERIES
   const themeResults = useMemo(
     () =>
       themeInsights.flatMap((insight) => {
@@ -592,6 +623,14 @@ export function MapWorkspace({
     setBboxInput(bboxToInputState(mapSelectionBbox))
   }, [mapSelectionBbox])
 
+  useEffect(() => {
+    setSelectedTemporalSeriesKey((current) =>
+      activeTemporalSeriesGroups.some((group) => group.key === current)
+        ? current
+        : activeTemporalSeriesGroups[0]?.key ?? '',
+    )
+  }, [activeTemporalSeriesGroups])
+
   useEffect(() => {
     const first = activeTemporalSeries[0]
     const last = activeTemporalSeries[activeTemporalSeries.length - 1]
@@ -912,7 +951,7 @@ export function MapWorkspace({
               <span>{analysisMode === 'evolution' ? 'Tijdreeks' : 'Actieve bron'}</span>
               <strong>
                 {analysisMode === 'evolution'
-                  ? activeTemporalSeries[0]?.temporal_series_key ?? 'Geen tijdreeks beschikbaar'
+                  ? activeTemporalSeriesGroup?.label ?? 'Geen tijdreeks beschikbaar'
                   : activeThemeDataset?.name ?? 'Geen databron beschikbaar'}
               </strong>
               <small>
@@ -928,6 +967,22 @@ export function MapWorkspace({
 
             {analysisMode === 'evolution' ? (
               <div className="geo-time-controls" aria-label="Meetmomenten vergelijken">
+                {activeTemporalSeriesGroups.length > 1 ? (
+                  <label className="geo-series-control">
+                    Reeks
+                    <select
+                      value={activeTemporalSeriesGroup?.key ?? ''}
+                      onChange={(event) => {
+                        setSelectedTemporalSeriesKey(event.target.value)
+                        clearTemporalComparison()
+                      }}
+                    >
+                      {activeTemporalSeriesGroups.map((group) => (
+                        <option key={group.key} value={group.key}>{group.label}</option>
+                      ))}
+                    </select>
+                  </label>
+                ) : null}
                 <label>
                   Van
                   <select value={earlierDatasetId} onChange={(event) => { setEarlierDatasetId(event.target.value); clearTemporalComparison() }} disabled={activeTemporalSeries.length < 2}>
@@ -1208,7 +1263,7 @@ export function MapWorkspace({
           <span>
             <strong>Bron:</strong>{' '}
             {analysisMode === 'evolution'
-              ? activeTemporalSeries[0]?.temporal_series_key ?? 'geen vergelijkbare tijdreeks'
+              ? activeTemporalSeriesGroup?.label ?? 'geen vergelijkbare tijdreeks'
               : activeThemeDataset
                 ? `${activeThemeDataset.source_name ?? activeThemeDataset.source} · ${activeThemeDataset.name}`
                 : 'niet beschikbaar'}

frontend/src/styles/app.css

@@ -5675,6 +5675,10 @@ section {
   font-size: 0.68rem;
 }
 
+.geo-time-controls .geo-series-control {
+  grid-column: 1 / -1;
+}
+
 .geo-time-controls button {
   grid-column: 1 / -1;
   min-height: 2.25rem;