Topic: mask

       r.mask                                                       Creates a MASK for limiting raster operation.

       r3.mask                                                      Establishes the current working 3D raster mask.

       See also the corresponding keyword mask for additional references.

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual

GRASS 7.4.0                                                                                   topic_mask(1grass)