---
name: "t.rast3d.algebra"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/t.rast3d.algebra"
---

# t.rast3d.algebra(1grass)

Apply temporal and spatial operations on space time 3D raster datasets using temporal 3D raster algebra.

## NAME

**t.rast3d.algebra**  - Apply temporal and spatial operations on space time 3D raster datasets using temporal 3D raster algebra.

## KEYWORDS

temporal, algebra, raster3d, voxel, time

## SYNOPSIS

**t.rast3d.algebra**\
 **t.rast3d.algebra --help**\
 **t.rast3d.algebra** \[-**sng**\] **expression**=*string* **basename**=*string*  \[**nprocs**=*integer*\]   \[--**help**\]  \[--**verbose**\]  \[--**quiet**\]  \[--**ui**\]

### Flags:

- **-s**

  Check the spatial topology of temporally related maps and process only spatially related maps

- **-n**

  Register Null maps

- **-g**

  Use granularity sampling instead of the temporal topology approach

- **--help**

  Print usage summary

- **--verbose**

  Verbose module output

- **--quiet**

  Quiet module output

- **--ui**

  Force launching GUI dialog

### Parameters:

- **expression**=*string* **\[required\]**

  Algebraic expression for temporal and spatial analysis of space time 3D raster datasets

- **basename**=*string* **\[required\]**

  Basename of the new generated output maps\
   A numerical suffix separated by an underscore will be attached to create a unique identifier

- **nprocs**=*integer*

  Number of r3.mapcalc processes to run in parallel\
   Default: *1*

## DESCRIPTION

*t.rast3d.algebra* performs temporal and spatial map algebra operations on space time 3D raster datasets (STR3DS) by using the temporal 3D raster algebra.

### NOTES

The module expects an **expression** as input parameter in the following form:

`"result = expression"`

The statement structure is exact the same as of *t.rast.algebra*, see t.rast.algebra but allows four-dimensional indexing.

## REFERENCES

PLY(Python-Lex-Yacc)

## SEE ALSO

*t.rast.algebra,* *t.rast3d.mapcalc,* *r.mapcalc,* *t.vect.algebra,* *t.select*

## AUTHORS

Thomas Leppelt, Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

## SOURCE CODE

Available at: t.rast3d.algebra source code (history)

Accessed: Monday Feb 24 17:51:47 2025

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