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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:

Code Block
north: n /* Northern boundary grid coordinate */

south: s /* Southern boundary grid coordinate */

east: e /* Eastern boundary grid coordinate */

west: w /* Western boundary grid coordinate */

rows: nrows /* Number of rows in the grid */

cols: ncols /* Number of columns in the grid */

z11 z12 z13 ... z1ncols /* values of row 1 */

z21 z22 z23 ... z2ncols /* values of row 2 */

.
.
.

znrows1 znrows2 znrows3 ... znrowsncols /* values of last row*/

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

Code Block
north: 3451250
south: 3438850
east: 298960
west: 290860
rows: 10
cols: 5
0 1 1 0 1
1 1 0 0 1
.
.
0 0 1 1 0