1r.mask(1)                     Grass User's Manual                    r.mask(1)
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NAME

6       r.mask  - Create a MASK for limiting raster operation
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KEYWORDS

9       raster, mask
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SYNOPSIS

12       r.mask
13       r.mask help
14       r.mask [-or] input=string  [maskcats=string]
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16   Flags:
17       -o  Overwrite existing MASK
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19       -r  Remove existing MASK (overrides other options)
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21   Parameters:
22       input=string
23           Raster map to use as MASK
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25       maskcats=string
26           Category values to use for MASK (format: 1 2 3 thru 7 *) Default: *
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DESCRIPTION

29       r.mask  - Facilitates creation of a raster "MASK" map to control raster
30       operations. r.mask uses r.reclass to create a  reclassification  of  an
31       existing raster map and name it MASK. The user can select cat values to
32       use in the MASK.
33       As long as the file named MASK  exists  in  the  current  mapset,  most
34       raster  operations  will only take place in the grid cells specified by
35       the MASK. To restore raster operations to normal (i.e.,  all  cells  of
36       the  current  region),  remove the MASK file by setting the remove MASK
37       flag (-r). A MASK also can be removed by using g.remove or by rename it
38       to any other name with g.rename.
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40       (GRASS Shell Script)
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SEE ALSO

43        r.reclass
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AUTHOR

46       Michael Barton, Arizona State University
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48       Last changed: $Date: 2007/03/08 13:51:30 $
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52GRASS 6.2.2                                                          r.mask(1)