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# t.rast3d.algebra.1grass - Man Page

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.algebrat.rast3d.algebra --helpt.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=stringÂ [required]

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

basename=stringÂ [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)

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

## Authors

Thomas Leppelt, SÃ¶ren Gebbert, ThÃ¼nen Institute of Climate-Smart Agriculture

## Source Code

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

Accessed: Tuesday May 14 13:42:04 2024

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Â© 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual

## Info

GRASS 8.3.2 GRASS GIS User's Manual