Dutch Portolan Demo

A collection of datasets from various Dutch institutions to demonstrate a Spatial Data Infrastructure built on Portolan.

Product Details

Visibility: Public
Owner: Chris Holmes
Created: 6 May 2026
Last Updated: 6 May 2026

Product Contents

root

vro

wandonderzoek

README

BRO Soil Trench Investigation (SFR / Wandonderzoek)

2,806 soil-profile pit/trench investigations (wandonderzoek, SFR) from the Dutch Key Registry of the Subsurface (BRO). Each point is a described soil face used for soil mapping, agriculture and nature management. Produced under VRO; bronhouder TNO.

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

Spatial coverage

Geometry: Point · Features: 2,806 · CRS: EPSG:4258
Bounding box (WGS84): [3.374896, 50.756136, 7.191841, 53.386308]

Schema

Column	Type	Description
soil_face_research_pk	int64	Internal primary key.
bro_id	string	BRO registration ID — unique identifier of the object in the Basisregistratie Ondergrond.
quality_regime	string	BRO quality regime: IMBRO (full assurance) or IMBRO/A (transitional/lower assurance).
delivery_accountable_party	string	KvK number of the party accountable for delivery (bronhouder).
delivery_context	string	Legal/administrative framework under which the object was registered.
survey_purpose	string	Purpose of the survey (e.g. national soil map unit, nature soil build-up).
discipline	string	Investigation discipline (bodemkunde / soil science).
research_report_date	string	Date the research report was registered (YYYY-MM-DD, free text).
fieldwork_date	string	Date of fieldwork (YYYY-MM-DD, free text).
litter_layer_investigated	string	Whether the litter layer was investigated (ja/nee).
applied_transformation	string	Whether a coordinate/height transformation was applied (ja/nee).
standardized_location	binary	Object location — WKB geometry in EPSG:4258 (ETRS89).
standardized_location_bbox	struct<xmin: float, ymin: float, xmax: float, ymax: float>	Per-feature bounding box struct (xmin,ymin,xmax,ymax) for spatial filtering.

Files

File	Format	Description
wandonderzoek.parquet	GeoParquet	2,806 features (EPSG:4258)
wandonderzoek.pmtiles	PMTiles	Vector tiles for web maps
styles/	Mapbox GL v8	Visualization styles
thumbnail.png	PNG	Official PDOK preview

Quick start

1import geopandas as gpd
2gdf = gpd.read_parquet('https://data.source.coop/cholmes/portolan-nl/vro/wandonderzoek/wandonderzoek.parquet')
1import geopandas as gpd
2gdf = gpd.read_parquet('https://data.source.coop/cholmes/portolan-nl/vro/wandonderzoek/wandonderzoek.parquet')

Styles

styles/default — BRO Soil Trench Investigation (SFR / Wandonderzoek) — Default
styles/by-survey-purpose — BRO Soil Trench Investigation (SFR / Wandonderzoek) — By survey purpose

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.