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| Earth Resources Observation and Science (EROS) |
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).
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For further assistance, please contact: Customer Services U.S. Geological Survey Center for Earth Resources Observation and Science (EROS) 47914 252nd Street Sioux Falls, SD 57198-0001 Tel: 800-252-4547 Tel: 605-594-6151 Fax: 605-594-6589 Email: custserv@usgs.gov Business Hours: Monday thru Friday, 8:00 a.m. to 4:00 p.m., central time |
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