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I recently downloaded GTopo30 DEM files from the USGS web site, but Surfer fails to recognize the DEM file as valid. How can I load these files into Surfer?

April 26, 2017DEM downloaded fails files Surfer USGS web site

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I recently downloaded GTopo30 DEM files from the USGS web site, but Surfer fails to recognize the DEM file as valid. How can I load these files into Surfer?

1 Answer

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A. GTopo30 DEM files are in a different format than the original USGS DEM files, even though they both use the .DEM file extension. Download a free conversion program from Golden Software, and follow the instructions contained within the file to convert the GTopo30 file to a Golden Software GRD file suitable for use with Surfer.