r.mask - Create a MASK for limiting raster operation
KEYWORDS
raster, mask
SYNOPSIS
r.mask r.mask help r.mask [-or] input=string [maskcats=string]
Flags:
-o
Overwrite existing MASK
-r
Remove existing MASK (overrides other options)
Parameters:
input=string
Raster map to use as MASK
maskcats=string
Category values to use for MASK (format: 1 2 3 thru 7 *)
Default: *
DESCRIPTION
r.mask - Facilitates creation of a raster "MASK" map to
control raster operations. r.mask uses r.reclass to create
a reclassification of an existing raster map and name it MASK. The
user can select cat values to use in the MASK.
As long as the file named MASK exists in the current mapset, most
raster operations will only take place in the grid cells specified by
the MASK. To restore raster operations to normal (i.e., all cells of
the current region), remove the MASK file by setting the remove MASK flag (-r). A MASK also can be removed by using g.remove
or by rename it to any other name with g.rename.