NASADEM: Global Sub-Swath Elevation Data at 1 Arc Second

NASADEM SRTM Subswath Global 1 arc second V001 is a digital elevation model produced by NASA's Land Processes DAAC. The dataset provides global Shuttle Radar Topography Mission (SRTM) sub-swath elevation data at 1 arc second spacing, covering land between 60° N and 56° S latitude, accounting for about 80% of Earth's landmass. It was derived from original SRTM telemetry data collected during the STS-99 mission in February 2000, with reprocessing improvements including the use of ASTER GDEM, ICESat GLAS ground control points, and void filling.

Use Cases

• Generate high-resolution terrain models based on the 1 arc second elevation data.
• Analyze radar backscatter properties for land cover classification based on correlation and incidence angle layers.
• Improve geolocation accuracy for other satellite datasets using the ground control points and reprocessing methods described.
• Fill elevation data voids in other DEM products using the interpolation techniques applied in this dataset.

Strengths

• Covers approximately 80% of Earth's total landmass between 60° N and 56° S latitude.
• Derived from original SRTM telemetry data with reprocessing improvements including conversion to geoid reference and void filling.
• Includes multiple data product layers such as radar correlation, individual images, and incidence angles.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration (NASA) Land Processes Distributed Active Archive Center (LP DAAC).

Collection Method

Derived from original telemetry data from the Shuttle Radar Topography Mission (SRTM) using radar interferometry, with additional processing from ASTER GDEM, ICESat GLAS, and other DEM sources.

Time Range

Primary data collected during the 11-day STS-99 mission launched on February 11, 2000.

Freshness

Last updated 2026-03-12 23:52:23.613505; freshness should be verified.

Geography

Global coverage of land between 60° N and 56° S latitude.