GRASS GIS manual: r3.gradient

Note: A new GRASS GIS stable version has been released: GRASS GIS 7.8, available here.
Updated manual page: here

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
EXAMPLES
SEE ALSO
AUTHORS

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

AUTHORS

Anna Petrasova, NCSU OSGeoREL, developed during GSoC 2014.

Last changed: $Date$

SOURCE CODE

Available at: r3.gradient source code (history)