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Map Question Pertaining To DEM Files


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Can anyone tell me what the .DEM files or used for. I think they have something to do with better map resolution, maybe. Anyways, do I need to keep the 118 mb US dem file if I want to use the NorthAmerica_low_2008_03_25.dem file that is 181mb since it covers the same region or not. I 'm starting to run out of space and have files in the DEM folder that aren't needed.

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Can anyone tell me what the .DEM files or used for. I think they have something to do with better map resolution, maybe. Anyways, do I need to keep the 118 mb US dem file if I want to use the NorthAmerica_low_2008_03_25.dem file that is 181mb since it covers the same region or not. I 'm starting to run out of space and have files in the DEM folder that aren't needed.

 

These are terrain elevation files. Not really needed, and unless you live in a mountain area you won't see much difference with or without them (or with a smaller one).

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