303,525 datasets indexed1,419 publishers
Open Data IndexThe index of open data about the Netherlands
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Central government

TNO Geologische Dienst Nederland

Independent research organisation. TNO's Geological Survey of the Netherlands runs the Key Register of the Subsurface on behalf of the Ministry of the Interior.

www.tno.nl

tno.nl
Screenshot of tno.nl
106datasets in our index
76%with an API or map service in the metadata
1sources explained
1examples with their data

What they publish

Counted across all indexes we harvest; modified between November 2008 and 4 October 2026.

Where it is

  • data.overheid.nl53
  • Nationaal Georegister53

Formats

WMS66INSPIRE ATOM37ATOM33ZIP16OGC® GEOPACKAGE ENCODING STANDARD15WFS8WCS6API FEATURES5GEOLOGY GML APPLICATION SCHEMA5SOIL GML APPLICATION SCHEMA2

Subjects (per the publisher)

Geo wetenschappelijke data24Bodem24Water (verkeer-thema)15Ruimtelijke ordening11(civiele) structuren10economie6Economie6Natuur en milieu2

Sources explained

Key Register of the Subsurface (BRO)

TNO Geologische Dienst Nederland, namens het ministerie van BZK; kopie via PDOKNetherlands, survey point (test, borehole, well)

The national register of what lies underground and what is measured there: cone penetration tests, geological, soil and geotechnical boreholes, groundwater monitoring wells with their time series (some from the 1950s), groundwater composition, abstractions and mining permits. Government bodies must have their surveys registered here; TNO runs the national facility on behalf of the Ministry of the Interior (BZK). Fourteen REST services on publiek.broservices.nl, each with an OpenAPI description, plus a copy on PDOK. On 16 October 2026 it held 97,768 groundwater monitoring wells.

OpenAPIMap layerDownloadClimate and environmentHousing and land
Up to date
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Examples with their data

Groundwater monitoring wells in the BRO by year built: 2,786 wells in 2025, 2.2 times as much as in 1990

Climate and environment · 2025

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