r3.mask - GRASS manual
Author: GRASS Development Team
Description: r3.mask: Establishes the current working 3D raster mask.
Keywords: raster3d, mask, null data, no-data, voxel

## NAME

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

## KEYWORDS

raster3d, mask, null data, no-data, voxel

## SYNOPSIS

r3.mask
r3.mask --help
r3.mask map=string [maskvalues=val[-val][,val[-val],...]] [--help] [--verbose] [--quiet] [--ui]

### Flags:

--help
  Print usage summary
--verbose
  Verbose module output
--quiet
  Quiet module output
--ui
  Force launching GUI dialog

### Parameters:

map=string [required]
  3D raster map with reference values
maskvalues=val[-val][,val[-val],...]
  List of cell values to be masked out

## DESCRIPTION

r3.mask facilitates the creation of a raster3d "MASK" map to control raster3d operations. The raster3d map is used as the reference map. Cells in the mask are marked as "mask out" if the corresponding cell in map contains a value in the range specified with maskvalues.

## NOTES

Before a new 3D-mask can be created the existing mask has to be removed with g.remove.

## SEE ALSO

g.remove

## AUTHORS

Roman Waupotitsch, Michael Shapiro, Helena Mitasova, Bill Brown, Lubos Mitas, Jaro Hofierka

## SOURCE CODE

Available at: r3.mask source code (history)

Accessed: Monday May 11 17:54:55 2026

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