GTOPO30
Global 30 Arc Second Elevation Data
Set
Representative
applications of GTOPO30
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HYDRO 1K:
Elevation Derivative Database
Click on an area of the map to preview or download
data.
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 EROS
Data Center (EDC). 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
Geospatial Information Authority of Japan (GSI)
Manaaki Whenua Landcare
Research of New Zealand, and the Scientific Committee on
Antarctic Research (SCAR).
edcweb@edcwww.cr.usgs.gov