USGS EROS Archive - Digital Elevation - Global 30 Arc-Second Elevation (GTOPO30)

Science Center Objects

Global 1-km digital raster data derived from a variety of sources.

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GTOPO30 Elevation Source Data

GTOPO30 Elevation Source Data
(Public domain)

GTOPO30 is a global digital elevation model (DEM) with a horizontal grid spacing of 30 arc seconds (approximately 1 kilometer). GTOPO30 was derived from several raster and vector sources of topographic information. For easier distribution, GTOPO30 has been divided into tiles which can be selected from the map shown above. Detailed information on the characteristics of GTOPO30 including the data distribution format, the data sources, production methods, accuracy, and hints for users, is found in the GTOPO30 README file.

GTOPO30, completed in late 1996, was developed over a three year period through a collaborative effort led by staff at 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).

Coverage Maps

Coverage Maps indicating the availability of GTOPO30 products are available for download.

Additional Information

Access Data

EarthExplorer can be used to search, preview, and download Global 30 Arc-Second Elevation (GTOPO30). The collection are located under the Digital Elevation category.