README

Buildings (INSPIRE Harmonized)

Name: Dutch Portolan Demo
Creator: Chris Holmes

All buildings in the Netherlands from the BAG (Basisregistratie Adressen en Gebouwen), harmonized to the EU INSPIRE Buildings schema. Contains 24.2 million building footprint polygons with construction dates and BAG identifiers. Includes both current and historical versions — records with endLifespanVersion = null are the current version. Published by Kadaster via PDOK.

🤖 AI/Agent users: See llms.txt for field descriptions, query examples, and usage tips.

Spatial Coverage

Bounding Box: [3.16, 50.750839, 7.226292, 53.541888]

Temporal Coverage

Start: open
End: ongoing

Schema

Column	Type	Description
OGC_FID	int64	Internal feature ID from WFS extraction
gml_id	string	GML feature identifier (format: nl-imbag-bu..)
beginLifespanVersion	string	When this version of the record was inserted into the dataset (ISO 8601 datetime)
anyPoint	string	Construction date (dateOfConstruction.anyPoint in INSPIRE schema, ISO 8601). Value of 9999-01-01 means planned/unknown.
endLifespanVersion	string	When this version was superseded (null = current version, non-null = historical)
localId	int64	BAG building identifier (pand ID). Unique across versions; multiple rows per localId represent version history.
namespace	string	INSPIRE namespace, always 'nl-imbag-bu'
referenceGeometry	bool	Whether this is the primary geometry representation (always true)
horizontalGeometryEstimatedAccuracy	string	Estimated horizontal accuracy in meters (not populated in this dataset)
verticalGeometryEstimatedAccuracy	string	Estimated vertical accuracy in meters (not populated in this dataset)
end	string	dateOfConstruction.end — end of construction period (not populated; use anyPoint instead)
beginning	string	dateOfConstruction.beginning — start of construction period (not populated; use anyPoint instead)
geometry	binary	Building footprint polygon in EPSG:4258 (ETRS89), WKB encoded

Files

File	Size	Checksum
./buildings.parquet	-	-
./buildings.gml.gz	-	-
./buildings.pmtiles	-	-
./thumbnail_.png	-	-

Quick Start

STAC Metadata

root: ../../catalog.json
parent: ../catalog.json

Source

https://www.pdok.nl/introductie/-/article/gebouwen-inspire-geharmoniseerd-

Processing Notes

INSPIRE-harmonized buildings from BAG, downloaded via PDOK WFS (https://service.pdok.nl/kadaster/bu/wfs/v1_0) using gpio extract wfs in a tiled grid. Tiles merged with DuckDB, then optimized with gpio (Hilbert sort + bbox covering columns). Original GML.gz from PDOK ATOM download service included as additional asset.

Attribution

Various Dutch government authorities

License

CC0-1.0

Contact

Chris Holmes cholmes@9eo.org

Generated by Portolan from STAC metadata and .portolan/metadata.yaml