## NAME

r3.null - Explicitly create the 3D NULL-value bitmap file.

## KEYWORDS

raster3d, map management, null data, no-data, voxel

## SYNOPSIS

r3.null
r3.null --help
r3.null map=string [setnull=val[-val][,val[-val],...]] [null=float] [--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 for which to modify null values
setnull=val[-val][,val[-val],...]
  List of cell values to be set to NULL
null=float
  The value to replace the null value by

## DESCRIPTION

r3.null modifies the NULL values of a 3D raster map.

## SEE ALSO

r.null

## AUTHORS

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

## SOURCE CODE

Available at: r3.null source code (history)

Accessed: Wednesday Feb 04 01:01:02 2026

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