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GRASS ASCII grid can be used as DEM (Digital Elevation Map) with a file extension .arx. It is a simple file format to represent gridded (or raster) data, for example, digital elevation data. The following is a description of the GRASS ASCII format:

The following is an actual GRASS ASCII Grid example (coordinates are in UTM):

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  1. Just a simple stupid note.
    It is worth to point out that the cell size force us to use grid coverages which have square cells. This can be a big limitation!