NASADEM_SHHP v001

NASADEM SRTM-only Height and Height Precision Product


PI: Sean Buckley

Description

The Land Processes Distributed Active Archive Center (LP DAAC) is responsible for the archive and distribution of NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) Digital Elevation Model (DEM) version 1 (NASADEM_SHHP) dataset, which provides Shuttle Radar Topography Mission (SRTM) global elevation height data at 1 arc second spacing.

NASADEM data products were derived from original telemetry data from SRTM, a collaboration between NASA and the National Geospatial-Intelligence Agency (NGA), as well as participation from the German and Italian space agencies. SRTM’s primary focus was to generate a near-global DEM of the Earth using radar interferometry. It was a primary component of the payload on space shuttle Endeavour during its STS-99 mission, which was launched on February 11, 2000, and flew for 11 days.

In addition to Terra Advanced Spaceborne Thermal and Reflection Radiometer (ASTER) Global Digital Elevation Model (GDEM) Version 2 data, NASADEM also relied on Ice, Cloud, and Land Elevation Satellite (ICESat) Geoscience Laser Altimeter System (GLAS) ground control points of its lidar shots to improve surface elevation measurements that led to improved geolocation accuracy. Other reprocessing improvements include the conversion to geoid reference and the use of GDEMs and Advanced Land Observing Satellite Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) AW3D30 DEM, and interpolation for void filling.

NASADEM are distributed in 1° by 1° tiles and consist of all land between 60° N and 56° S latitude. This accounts for about 80% of Earth’s total landmass.

NASADEM_SHHP data product layers include SRTM-only floating-point DEM and height error. A low-resolution browse image showing the SRTM-only elevation is also available for each NASADEM_SHHP granule.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionMEaSUREs NASADEM
DOI10.5067/MEaSUREs/NASADEM/NASADEM_SHHP.001
File Size~75.99 MB
Temporal ResolutionMulti-Day
Temporal Extent2000-02-11 to 2000-02-21
Spatial ExtentGlobal (60°N to 56°S, 180°W to 180°E)
Coordinate SystemGeographic Latitude and Longitude
DatumWGS84/EGM96
File FormatRAW
Geographic Dimensions1° x 1°

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers2
Columns/Rows3601 x 3601
Pixel Size~30 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
HGT_SRTMONLY (HGTS) SRTM-only floating-point DEM Meters 32-bit real -32768 N/A N/A N/A
ERR Height error (precision) mm 16-bit unsigned integer 32769 N/A Non-negative N/A

Documentation

Using the Data

Access Data

Citation

DOI: 10.5067/MEaSUREs/NASADEM/NASADEM_SHHP.001

About the Image

NASADEM SRTM-only Height and Height Precision data over the Grand Canyon, 2000.

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