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Actually, now that I look at the downloaded files more closely, it appears the data is there but C3D is not reading it (or not reading it correctly).
I suggest new file from Metric templatenew surfaceinsert the DEM dataExport to XMLNew File from Imperial templateinport the XML file created above
This is what I am currently doing as a work-a-round. I was playing with the GDAL utilities as suggested by Cathy and using them you can convert the grid file to a SHP contour file. This can then be used to create a surface as well.
drizzt, what tool did you use to scale the DEM elevations? I am more interested in the method than getting the file converted. This is not the only DEM file I am working with. There are several work-a-rounds that I can do, but they are all convoluted and time consuming. There are also a lot of crashes involved as most of the DEM files are pretty large.
then change the projection in global mapper and export dem