feat: add governed agricultural parcel history

2026-07-15 14:49:52 +02:00
parent 2f3445aa5b
commit 7f1064ff1e
16 changed files with 1194 additions and 5 deletions
@@ -228,6 +228,27 @@ an estimate warning, especially for partial rectangle intersections. State
 2025 is a product edition and must not be presented as a uniform 2025 field
 survey or an annual time series.

+### Annual agricultural-use parcels
+
+Definitive Agentschap Landbouw en Zeevisserij editions from 2008 through 2025
+are stored as separate annual vector Datasets. The retained source is the
+official ZIP archive containing a Belgian Lambert 72 GeoPackage. Queryable
+geometry is clipped against the persisted Area in EPSG:31370 and normalized to
+EPSG:4326 before canonical `vector_features` persistence.
+
+Stable source fields include `agpakey`, parcel number, declared source area,
+reference id, spring crop, main crop, official main-crop group, production
+method and source municipality. All annual source properties remain available,
+but only `maincropgroup_title` is normalized to a controlled comparison key.
+Detailed crop codes and titles can change meaning or wording between editions;
+their complete annual code list is therefore retained with the source archive.
+
+Historical analysis compares intersected hectares for the complete declaration
+and official main-crop groups. It must not compare individual parcel lineage:
+identifiers, boundaries and declarations are not stable between campaign years.
+The declaration can include water, hedges, buildings and infrastructure, so its
+total is not a cadastral ownership area or cultivated-crop area.
+
 ### Vector

 Ondersteund: