README

BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM)

80,148 landform polygons of the national Geomorphological Map of the Netherlands 1:50,000 (Geomorfologische kaart, GMM), classified by genesis, relief and landform subgroup. Produced under VRO; bronhouder Wageningen Environmental Research.

AI/Agent users: see llms.txt for field meanings, query examples and caveats.

Spatial coverage

Geometry: MultiPolygon · Features: 80,148 · CRS: EPSG:28992
Bounding box (WGS84): [3.357819, 50.750537, 7.228386, 53.558432]

Schema

Column	Type	Description
fid	int64	Feature ID.
collection_id	string
identification	string
relief_code	int64	Relief-form code.
active_process	string	Whether the landform process is still active (ja/nee).
genese_code	string	Genesis code (1=Glaciaal, 2=Periglaciaal, 3=Denudatief, 4=Fluviatiel, 5=Eolisch, 6=Lacustrien, 7=Marien, 8=Organogeen, 9=Antropogeen, 0=Tectonisch).
landform_subgroup_code	string	Landform subgroup code (e.g. B44 = stroomrug/stream ridge).
additional_surface_relief_code	string	Additional surface relief code (optional).
additional_surface_cover_code	string	Additional surface cover code (optional).
genese_description	string	Genesis description (Dutch).
genese_validfrom	int64
genese_validto	int64
landform_subgroup_description	string	Landform subgroup description (Dutch).
landform_subgroup_url	string	URL to the landform legend entry.
landform_subgroup_validfrom	int64
landform_subgroup_validto	int64
additional_surface_relief_description	string
additional_surface_relief_validfrom	int64
additional_surface_relief_validto	int64
additional_surface_cover_description	string
additional_surface_cover_validfrom	int64
additional_surface_cover_validto	int64
relief_klasse	string
relief_subklasse	string
helling	string
lokaal_maximaal_hoogteverschil	string
diepte_tov_omgeving	string
steilste_verhang	string
maximaal_hoogteverschil	string
maximaal_verval	string
relief_validfrom	int64
relief_validto	int64
geom	binary	Feature geometry (WKB) in EPSG:28992 (Amersfoort / RD New).
geom_bbox	struct<xmin: float, ymin: float, xmax: float, ymax: float>	Per-feature bounding box struct for spatial filtering.

Files

File	Format	Description
geomorphological_area.parquet	GeoParquet	80,148 features (EPSG:28992)
geomorphological_area.pmtiles	PMTiles	Vector tiles for web maps
styles/	Mapbox GL v8	Visualization styles
thumbnail.png	PNG	Official PDOK preview

Quick start

Styles

styles/default — BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM) — Default
styles/by-relief — BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM) — By relief class

Source

PDOK — Basisregistratie Ondergrond (BRO). Provider: Ministerie van Volkshuisvesting en Ruimtelijke Ordening (VRO). Bronhouder: TNO – Geologische Dienst Nederland / Wageningen Environmental Research.

License

CC0-1.0 — public domain.

Part of Portolan NL · generated from STAC metadata.

README

BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM)

AI/Agent users: see llms.txt for field meanings, query examples and caveats.

Spatial coverage

Geometry: MultiPolygon · Features: 80,148 · CRS: EPSG:28992
Bounding box (WGS84): [3.357819, 50.750537, 7.228386, 53.558432]

Schema

Column	Type	Description
fid	int64	Feature ID.
collection_id	string
identification	string
relief_code	int64	Relief-form code.
active_process	string	Whether the landform process is still active (ja/nee).
genese_code	string	Genesis code (1=Glaciaal, 2=Periglaciaal, 3=Denudatief, 4=Fluviatiel, 5=Eolisch, 6=Lacustrien, 7=Marien, 8=Organogeen, 9=Antropogeen, 0=Tectonisch).
landform_subgroup_code	string	Landform subgroup code (e.g. B44 = stroomrug/stream ridge).
additional_surface_relief_code	string	Additional surface relief code (optional).
additional_surface_cover_code	string	Additional surface cover code (optional).
genese_description	string	Genesis description (Dutch).
genese_validfrom	int64
genese_validto	int64
landform_subgroup_description	string	Landform subgroup description (Dutch).
landform_subgroup_url	string	URL to the landform legend entry.
landform_subgroup_validfrom	int64
landform_subgroup_validto	int64
additional_surface_relief_description	string
additional_surface_relief_validfrom	int64
additional_surface_relief_validto	int64
additional_surface_cover_description	string
additional_surface_cover_validfrom	int64
additional_surface_cover_validto	int64
relief_klasse	string
relief_subklasse	string
helling	string
lokaal_maximaal_hoogteverschil	string
diepte_tov_omgeving	string
steilste_verhang	string
maximaal_hoogteverschil	string
maximaal_verval	string
relief_validfrom	int64
relief_validto	int64
geom	binary	Feature geometry (WKB) in EPSG:28992 (Amersfoort / RD New).
geom_bbox	struct<xmin: float, ymin: float, xmax: float, ymax: float>	Per-feature bounding box struct for spatial filtering.

Files

File	Format	Description
geomorphological_area.parquet	GeoParquet	80,148 features (EPSG:28992)
geomorphological_area.pmtiles	PMTiles	Vector tiles for web maps
styles/	Mapbox GL v8	Visualization styles
thumbnail.png	PNG	Official PDOK preview

Quick start

Styles

styles/default — BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM) — Default
styles/by-relief — BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM) — By relief class

Source

License

CC0-1.0 — public domain.

Part of Portolan NL · generated from STAC metadata.

BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM)

Spatial coverage

Schema

Files

Quick start

Styles

Source

License

Dutch Portolan Demo

BRO Geomorphological Map 1:50,000 — Geomorphological areas (GMM)

Spatial coverage

Schema

Files

Quick start

Styles

Source

License