README

Flood Retention Areas

Name: Dutch Portolan Demo
Creator: Chris Holmes

Designated flood retention areas (bergingsgebieden) across the Netherlands, where water can be temporarily stored during high water events to protect populated areas. 1,545 MultiPolygon features.

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

Spatial Coverage

Bounding Box: [4.071981, 51.220930, 7.216291, 53.414465]

Schema

Column	Type	Description
OBJECTID	int64	Feature ID
naam	string	Name of the retention area
bergendvermogen	double	Storage capacity (m³)
code	string	Area code
statuslegger	string	Registry status
statusobject	string	Object status
indicatiewettelijkvastgesteld	string	Legally established indicator
objectbegintijd	string	Object start date
opmerking	string	Remarks
url	string	Reference URL
Shape__Area	double	Area in m²
Shape__Length	double	Perimeter in m
geometry	binary	MultiPolygon in EPSG:28992 (RD New), WKB encoded

Files

File	Format	Description
bergingsgebieden.parquet	GeoParquet	1,545 flood retention area polygons
bergingsgebieden.pmtiles	PMTiles	Vector tiles for web visualization

Quick Start

STAC Metadata

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

Source

ArcGIS FeatureServer

Attribution

Rijkswaterstaat

License

Proprietary

Contact

Chris Holmes cholmes@9eo.org

Generated by Portolan from STAC metadata