NASADEM: NASA 30m Digital Elevation Model

  • NASADEM is a reprocessing of SRTM data with improved accuracy using auxiliary datasets.

  • Processing improvements include void reduction through phase unwrapping and using ICESat GLAS data.

  • The dataset is available from February 11 to February 22, 2000.

  • It includes bands for elevation, source data index (num), and updated water body data (swb) with a pixel size of 30 meters.

  • NASA-produced data, like NASADEM, can be used for any purpose without prior permission.
NASA/NASADEM_HGT/001
Dataset Availability
2000-02-11T00:00:00Z–2000-02-22T00:00:00Z
Dataset Provider
Earth Engine Snippet
ee.Image("NASA/NASADEM_HGT/001")
Tags
dem elevation elevation-topography geophysical nasa srtm topography usgs
nasadem

Description

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:

Bands

Pixel Size
30 meters

Bands

Name Units Min Max Pixel Size Description
elevation m -512* 8768* meters

Integer heights in the merged void-free DEM files are relative to the EGM96 geoid (whereas the floating-point heights in the SRTM-only DEM files are relative to the WGS84 ellipsoid).
num 0 255 meters

Index indicating the data source and the number of source scenes.

  • 0: Water in corrected SRTM water body data
  • 1-23: SRTM 1-23 (max known is 23)
  • 41-94: PRISM 1-50 (54 max polar, 37 max elsewhere)
  • 110-160: GDEM3 (saturated at 50)
  • 170-220: GDEM2 (saturated at 50)
  • 231: SRTMv3 from GDEM3
  • 232: SRTMv2 from GDEM3
  • 233: SRTMv2 from GDEM2
  • 234: SRTM-with-NGA-fill from GDEM2
  • 241: NED from GDEM2 (USA)
  • 242: NED from GDEM3 (USA)
  • 243: CDED from GDEM2 (Canada)
  • 244: CDED from GDEM3 (Canada)
  • 245: Alaska from GDEM2 (Alaska)
  • 246: Alaska from GDEM3 (Alaska)
  • 250: Interpolation
  • 251: Quad edge averaged where two neighboring quads disagreed (generally a GDEM error)
  • 255: ERROR (if NUM IS MISSING - none known to exist)
swb 0 255 meters

Updated SRTM water body data

  • 0: Land
  • 255: Water
* estimated min or max value

swb Class Table

Value Color Description
0 brown

Land
255 cadetblue

Water

Terms of Use

Terms of Use

Unless otherwise noted, all NASA-produced data may be used for any purpose without prior permission. For more information and exceptions visit the NASA Data & Information Policy page.

Citations

Citations:

Explore with Earth Engine

Code Editor (JavaScript)

// Import the dataset and select the elevation band.
var dataset = ee.Image('NASA/NASADEM_HGT/001');
var elevation = dataset.select('elevation');

// Add a white background image to the map.
var background = ee.Image(1);
Map.addLayer(background, {min: 0, max: 1});

// Set elevation visualization properties.
var elevationVis = {
  min: 0,
  max: 2000,
};

// Set elevation <= 0 as transparent and add to the map.
Map.addLayer(elevation.updateMask(elevation.gt(0)), elevationVis, 'Elevation');
Map.setCenter(17.93, 7.71, 2);
Open in Code Editor
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
NASA/NASADEM_HGT/001, dem,elevation,elevation-topography,geophysical,nasa,srtm,topography,usgs
2000-02-11T00:00:00Z/2000-02-22T00:00:00Z
-56 -180 60 180
Google Earth Engine