dataset · USA

USGS 3DEP Seamless DEMs

U.S.-wide digital elevation data at horizontal resolutions ranging from one to sixty meters. The [USGS 3D Elevation Program (3DEP) Datasets](https://www.usgs.gov/core-science-systems/ngp/3dep) from the [National Map](https://www.usgs.gov/core-science-systems/national-geospatial-program/national-map) are the primary elevation data product produced and distributed by the USGS. The 3DEP program provides raster elevation data for the conterminous United States, Alaska, Hawaii, and the island territo

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Source details

Licence: PDDL-1.0

Evidence quality: 33.8

Listed in planetary-computer public catalogue API on 2026-10-16; relevance/value screened (haiku).

Metadata checked: 2026-10-14T13:20:00.000Z

What's in it

Data offered llm-inferred: bare-earth or surface elevation (DEM/raster elevation data) · elevation at 1 m to 60 m horizontal resolution
Coverage llm-inferred: USA: conterminous United States, Alaska, Hawaii and island territories (description is truncated)
Resolution llm-inferred: 1 m to 60 m horizontal
Access llm-inferred: Open data, no auth listed; licence PDDL-1.0 (public domain dedication)

Useful for

Use cases llm-inferred: Catchment delineation and flow-path analysis for US hydrological modelling inputs · Topographic baseline for cut/fill and earthworks volume estimates on US project sites · Terrain derivatives (slope, aspect) for geotechnical or drainage screening in the US
Audience llm-inferred: GIS analysts · hydrologists · civils engineers · geotechnical engineers

Limitations

Constraints llm-inferred: Covers the USA only; no UK coverage, so not usable for UK sites · Description is truncated, so the full coverage list is not confirmed · No docs retrieved; formats, update cadence and time span are unverified

Evidence

Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.