I downloaded DEM files from the USGS web site or from the GIS Data Depot, but Surfer fails to recognize the DEM file as valid. How can I load these files into Surfer?
A. Surfer recognizes ASCII DEM (1?x 1?- 1:250,000 scale with 3 arc-sec grid spacing, 7.5 minute – 1:24,000 scale with 30m grid spacing), GTOPO30 DEM (40?x 50?- 1:1,000,000 scale with 30 arc-second spacing), and SDTS DEM (size and scale vary) formats. These files are often compressed and archived in a .tar.gz format (both tar’d and gzip’d). Files must be extracted prior to use within Surfer. The WinZip program is a good choice for extracting the files, but disable the option to use “TAR file smart CR/LF conversion” in the Options | Configuration | Miscellaneous menu prior to extracting the files.
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