High Resolution Digital Elevation Model (HRDEM) Mosaic at 2-meter resolution from Natural Resources Canada (NRCan). Indexed from the hrdem-mosaic-2m collection of the NRCan Data Cube STAC API (geo.ca).
Source & method: The HRDEM Mosaic merges many acquisition projects into a single continuous surface (newer data replaces older where they overlap). The 2-meter mosaic corresponds to lower-density airborne lidar (average nominal pulse density < 2 pts/m²) and, in northern Canada (north of the productive forest line), to photogrammetric DSMs derived from optical stereo satellite imagery (occasionally supplemented by radar interferometry). In the north only a DSM is generally produced, so DTM coverage there may be limited or absent. Hillshades are derived products.
Products: DTM (bare earth) and DSM (first surface), plus derived hillshades where available.
Resolution: 2 m ground sample distance.
Coordinate reference: NAD83(CSRS) / Canada Atlas Lambert (EPSG:3979); orthometric elevations in meters on CGVD2013 (EPSG:6647).
Documentation:
Access
The catalog is browsable without a key. Elevation lookups need a free API key, sent as an X-API-Key header; see the quickstart.
curl "https://api.darly.io/collections/can-nrcan-hrdem-2m/items?limit=5"curl -H "X-API-Key: $DARLY_API_KEY" \
"https://api.darly.io/v1/elevation/point?lat=62.45&lon=-96.79&collections=can-nrcan-hrdem-2m"from pystac_client import Client
catalog = Client.open("https://api.darly.io")
search = catalog.search(collections=["can-nrcan-hrdem-2m"], bbox=[-140.97, 41.68, -52.61, 83.23], max_items=5)
for item in search.items():
print(item.id, item.assets["dtm"].href if "dtm" in item.assets else item.assets["dsm"].href)Providers
- Natural Resources Canada (NRCan) — producer, licensor, host
- Darly — processor
Citation
Natural Resources Canada, High Resolution Digital Elevation Model (HRDEM) Mosaic - 2 m, https://open.canada.ca/data/en/dataset/0fe65119-e96e-4a57-8bfe-9d9245fba06b.