## 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: Thursday Oct 30 22:19:00 2025

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