dataset · Global
NASADEM: NASA 30m Digital Elevation Model
NASADEM is a reprocessing of SRTM data, with improved accuracy by incorporating auxiliary data from ASTER GDEM, ICESat GLAS, and PRISM datasets. The most significant processing improvements involve void reduction through improved phase unwrapping and using ICESat GLAS data for control. Documentation: * [User's Guide](https://lpdaac.usgs.gov/documents/592/NASADEM_User_Guide_V1.pdf)
Visit source ↗Source details
Licence: proprietary
Evidence quality: 31.9
Listed in gee 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 docs-verified
- elevation (DEM heights) · source data index (num) · water body data (swb)
- Coverage llm-inferred
- Global per ENTRY regions; DOCS bounding box values are -56, -180, 60, 180 (roughly 56°S to 60°N) · 2000-02-11 to 2000-02-22
- Resolution docs-verified
- 30 m pixel size (all bands)
- Formats docs-verified
- Google Earth Engine image (ee.Image)
- Access docs-verified
- Usable for any purpose without prior permission under NASA terms (DOCS). Earth Engine access requires registration. ENTRY licence field says 'proprietary', which conflicts with DOCS.
Useful for
- Use cases llm-inferred
- FRA baseline catchment delineation and slope analysis from 30 m DEM · Drainage strategy flow-path and fall analysis for preliminary layouts · Preliminary site levels and earthworks cut/fill screening · Water body masking via swb band for floodplain baseline mapping
- Audience llm-inferred
- flood consultants · hydrologists · drainage engineers · GIS analysts · civils engineers
Limitations
- Constraints llm-inferred
- Single acquisition window (Feb 2000), so it does not show current terrain · Merged void-free elevation integers are relative to the EGM96 geoid, not the WGS84 ellipsoid (DOCS), so vertical datum must be handled in analysis · Filled voids are flagged in the num band (e.g. 250 interpolation, 251 edge-averaged), so QA masking may be needed · 30 m resolution is too coarse for site-scale or detailed drainage design · Requires Earth Engine access; ENTRY shows auth as null but DOCS say registration is needed · Stated bounding box is about 56°S to 60°N, which conflicts with the ENTRY 'Global' label · ENTRY licence 'proprietary' conflicts with DOCS terms
Evidence
- ee.Image('NASA/NASADEM_HGT/001')
- https://developers.google.com/earth-engine/datasets/catalog/NASA_NASADEM_HGT_001
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.