Het Waterschapshuis
Coordinating organisation of the 21 Dutch water authorities. Manages the national elevation model (AHN) on behalf of the water authorities, provinces and central government.
What they publish
Counted across all indexes we harvest; modified between January 2012 and 29 October 2026.
Where it is
- Nationaal Georegister72
- GBIF, datasets uit en over Nederland5
Formats
Subjects (per the publisher)
Sources explained
Actueel Hoogtebestand Nederland (AHN, national elevation model)
The elevation map of the Netherlands, measured by laser from an aircraft: at least ten measurements per square metre. There are two maps. The terrain model (DTM) is the bare ground. The surface model (DSM) is everything on it, including buildings and trees. Via PDOK as a map layer (WMS), as a raster API (WCS) and as a download.
Water authority data (IMWA and DAMO)
Six map services from Het Waterschapshuis with the assets of all 21 Dutch water authorities in one national model (IMWA): structures such as pumping stations, weirs, locks and culverts, flood defences and how they are built, surface water, water level areas, protection zones and the wastewater chain (sewage pumping stations, treatment plants, pipes). On 16 October 2026 it held 8,566 pumping stations, 53,137 weirs, 626,869 culverts, 37,419 water level areas and 317 wastewater treatment plants. Every object names its water authority. Via PDOK as OGC API, and for five of the six also as WFS and WMS.
Examples with their data
Pumping stations per water authority: most Hoogheemraadschap Hollands Noorderkwartier (2,293 pumping stations), then Wetterskip Fryslân and Hoogheemraadschap van Rijnland
Water authority structures by type: most culverts (626,955 objects), then bridges and fixed dams
The relief of the hills around Valkenburg, from the Actueel Hoogtebestand Nederland
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