A collection of datasets from various Dutch institutions to demonstrate a Spatial Data Infrastructure built on Portolan.
This is a Portolan data catalog synced with Source Cooperative.
A cloud-native geospatial data catalog of open Dutch government geodata, organized by the institution that produces it. Inspired by PDOK, but using modern cloud-native formats: GeoParquet, PMTiles, and STAC metadata on object storage.
s3://us-west-2.opendata.source.coop/cholmes/portolan-nl/source (in ~/.aws/credentials).env in this directoryThis catalog is managed with Portolan CLI (portolan command). Key commands:
Always use --profile source for authenticated operations, or rely on the .env file which sets PORTOLAN_PROFILE=source.
For manual S3 operations, use --profile source with aws cli:
This is a nested STAC catalog. Subcatalogs represent Dutch government institutions; collections within them are individual datasets.
Each collection typically contains:
.parquet — GeoParquet: the analytics-ready vector data.pmtiles — PMTiles: for instant map visualization (no tile server needed)collection.json — STAC collection metadatallms.txt — LLM-readable description of the dataversions.json — Portolan version trackingREADME.md — Human-readable description (some collections)thumbnail_.png — Map preview image (some collections).portolan/metadata.yaml — Portolan enrichment metadata (some collections)When asked to improve the catalog, consider:
.portolan/metadata.yamlportolan check to validate cloud-native complianceUse STAC terms consistently:
kadaster/)kadaster/bag_light/).parquet, .pmtiles, etc.)Do NOT use "dataset" — it's ambiguous. Say "collection" instead.