A collection of datasets from various Dutch institutions to demonstrate a Spatial Data Infrastructure built on Portolan.
Point locations of 92 navigation locks (sluizen) on the Dutch recreational waterway network. Each lock includes its name, location, number of chambers, VHF radio channel, operator information, and contact details.
Locks are essential infrastructure in the Netherlands, allowing vessels to move between waterways at different water levels. This dataset covers locks on the recreational network managed by various authorities including Rijkswaterstaat, provinces, and municipalities.
Provider: Rijkswaterstaat (Directorate-General for Public Works and Water Management) License: Public domain (Dutch government open data)
The data is a GeoParquet file in EPSG:28992 (Amersfoort / RD New). Use DuckDB with the spatial extension.
The file is tiny (92 features) — loads instantly.
One Mapbox GL v8 style is available for interactive map visualization via the PMTiles file.
Style files are Mapbox GL v8 JSON with relative PMTiles source paths. They can be used with MapLibre GL JS, OpenLayers (via ol-mapbox-style), or any Mapbox GL v8-compatible renderer.
styles/default.json — Red circles sized by NR_KOLKEN (number of lock chambers). Larger circles = more chambers = higher-capacity locks. Labels show lock names at higher zoom.Style files are at: https://data.source.coop/cholmes/portolan-nl/rijkswaterstaat/sluizen/styles/
NAAM, PLAATSNAAM, NR_KOLKEN).NR_KOLKEN may be stored as float due to null handling; cast to int for display.TEL_NR) may be outdated.Hand-maintained agent guide (ported from this collection's llms.txt in August 2026). Update it alongside collection.json.
BHR_TYPE| string |
| Operator type (e.g., government, province, municipality). |
TEL_NR | string | Phone number for the lock operator. |