I've downloaded several 7.5 minute DEM files from USGS and they have file names like:
1661629.DEM.SDTS.TAR
On MAC these decompress into a folder with serval files having the extension '.DDF'. Is there a shareware program that allows me to convert them to a basic ASCII text DEM file under the Mac OS X operating system?
Answer
GDAL is a free geospatial raster translation program that will convert USGS sdts dem to USGS asci dem. A Mac installer is available here gdal installers.
I'm unfamiliar with a Mac, but you will run gdal_translate.exe from a command line. Something like gdal_translate -of USGSDEM 1661629.DEM.SDTS. -of is the output format. The gdal_translate command help page is here translate These are gdal format abbreviations formats
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