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GTOPO30 is a digital elevation model for the world, developed by United States Geological Survey (USGS). It has a 30-arc second resolution (approximately 1 km), [1] and is split into 33 tiles stored in the USGS DEM file format.


According to DTED and USGS DEM the absolute vertical accurancy of GTOP30 varies from ±30 meters.[2]

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