Creation year

1996

1 record(s)
 
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  • GTOPO30

    GTOPO30 is a global digital elevation model (DEM). It was derived from several raster and vector sources of topographic information. 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).