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How to convert a raster file in a USGS DEM (*.dem) file ?

Question asked by geonetadmin on Jan 17, 2012
Latest reply on Jan 20, 2012 by geonetadmin
Original User: KevinCRDA


I'm working on a project where I need to create orthophotos. To do that, I need to import in Summit Evolution a USGS DEM file (*.dem).

I must use the NAD83 MTM7 projection. My original DEMs are in Lat/Long geographic coordinate system. I'm doing a raster projection change in ArcMap10, but it changes my *.DEM file into a raster file that I can't import in Summit. I tried to export the raster file into an ASCII file (I can import in Summit that kind of file too), but when I import it into Summit, the minimum elevation value is -9999 and the maximum value is 320 instead of being 120 for the minimum and 460 for the maximum, so it doesn't work.

Is there a way to convert my raster file back in a *.DEM file, so I could use it in Summit ? Or is there another way to change directly the projection in the *.dem file (I used 3DEM which works very well to change the projection to UTM, but I need to be in MTM) ?

Thanks a lot,