USGS 3DEP Seamless 1-meter DEM (S1M)
Limited availability. USGS lists S1M as “Seamless 1-meter DEM (Limited Availability)”. Coverage is partial and growing; areas without a shaded square have no S1M tile yet. Use 3DEP 1-meter project DEMs or 1/3 arc-second DEMs there.
Click a tile to see its attributes, source lidar work units (read live from the tile’s spatial-metadata GeoPackage), blending statistics, and download links.
Data sources
- Tile footprints & attributes: S1M_Products.gpkg (USGS full-extent S1M index, layer current), embedded snapshot .
- Per-tile source lidar: each tile’s
S1M_<tile>_<date>.gpkg on prd-tnm.s3.amazonaws.com (layers s1m_source_inputs, s1m_blending_area_statistics), fetched when you click.
- Lidar project details: 3DEP Elevation Index, Lidar Point Cloud layer (WESM), queried live by work-unit name.
- Product listing: TNM Access API, dataset “Seamless 1-m DEM (S1M)”.
- Basemaps: USGS National Map WMTS (basemap.nationalmap.gov), public domain.