r3.gradient(1)

NAME
r3.gradient - Computes gradient of a 3D raster map and outputs gradient components as three 3D raster maps.

KEYWORDS
raster3d, gradient, voxel

SYNOPSIS
r3.gradient
r3.gradient --help
r3.gradient input=name output=grad_x,grad_y,grad_z[,grad_x,grad_y,grad_z,...] [blocksize=size_x,size_y,size_z[,size_x,size_y,size_z,...]] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

  Flags:

--overwrite
    Allow output files to overwrite existing files

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

input=name [required]
    Name of input 3D raster map

output=grad_x,grad_y,grad_z[,grad_x,grad_y,grad_z,...] [required]
    Name for output 3D raster map(s)

blocksize=size_x,size_y,size_z[,size_x,size_y,size_z,...]
    Size of blocks
    Default: 30,30,20

DESCRIPTION
Module r3.gradient computes gradient from a 3D raster map. Results are three 3D raster maps describing the x, y, z components of the computed gradient field.

EXAMPLES

# create a 3D raster
g.region s=0 n=100 w=0 e=100 b=0 t=100 -p
r3.mapcalc "test_gradient = sqrt(row()*row() +col()*col()+ depth()*depth())"
# compute gradient
r3.gradient input=test_gradient output=grad_x,grad_y,grad_z

SEE ALSO
r3.flow, r.flow

AUTHORS
Anna Petrasova, NCSU OSGeoREL, developed during GSoC 2014.

SOURCE CODE

Available at: r3.gradient source code (history)

Accessed: Wednesday Jun 03 04:20:14 2026

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