GTOPO30: Global 30 Arc-Second Elevation

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dem elevation geophysical nasa topography usgs


GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). The DEM was derived from several raster and vector sources of topographic information. Completed in late 1996, GTOPO30 was developed over a three-year period through a collaborative effort led by the U.S. Geological Survey''s Center for Earth Resources Observation and Science (EROS). The following organizations participated by contributing funding or source data: the National Aeronautics and Space Administration (NASA), the United Nations Environment Programme/Global Resource Information Database (UNEP/GRID), the U.S. Agency for International Development (USAID), the Instituto Nacional de Estadistica Geografica e Informatica (INEGI) of Mexico, the Geographical Survey Institute (GSI) of Japan, Manaaki Whenua Landcare Research of New Zealand, and the Scientific Committee on Antarctic Research (SCAR).



Name Units Min Max Pixel Size Description
elevation m -407* 8752* 927.67 meters


* estimated min or max value

Terms of Use

Terms of Use

There are no restrictions on the use of data received from the U.S. Geological Survey's Earth Resources Observation and Science (EROS) Center. For more information, visit the USGS' Data Use and Citation page.


  • GTOPO30 DEM courtesy of the U.S. Geological Survey

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.Image('USGS/GTOPO30');
var elevation ='elevation');
var elevationVis = {
  min: -10.0,
  max: 8000.0,
  gamma: 1.6,
Map.setCenter(11.69, 43.9, 4);
Map.addLayer(elevation, elevationVis, 'Elevation');
Open in Code Editor