---
name: "r3.null"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/r3.null"
---

# r3.null(1grass)

Explicitly create the 3D NULL-value bitmap file.

## 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: Monday Feb 24 17:51:07 2025

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