README

Primary Flood Defenses

Name: Dutch Portolan Demo
Creator: Chris Holmes

Primary water barriers (primaire keringen) across the Netherlands — 238 dike sections that form the backbone of Dutch flood protection under the Water Act (Waterwet). LineString features with safety norms per section.

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

Spatial Coverage

Bounding Box: [3.372100, 50.776122, 7.211409, 53.495879]

Schema

Column	Type	Description
OBJECTID	int64	Feature ID
TRAJECT_ID	string	Dike section identifier (e.g. "1-1", "95-1")
NORMTYP_O	string	Norm type: Faalkans (failure probability) or Overstromingskans (flood probability)
NORM_SW	int32	Norm value — Significant Wave height
NORM_OG	int32	Norm value — Overtopping/Overflow
NORM_THB	int32	Norm value — Technical/Hydraulic Boundary
NORM_NS	int32	Norm value — New Standard
WET_JN	string	Under Water Act (Ja/Nee)
VERSIE	string	Version
Shape__Length	double	Section length in metres
geometry	binary	LineString in EPSG:28992 (RD New), WKB encoded

Files

File	Format	Description
waterkeringen.parquet	GeoParquet	238 dike section linestrings
waterkeringen.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