r3.gradient.1grass - Man Page

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)

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