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

NAME  KEYWORDS  SYNOPSIS  Flags:  Parameters:  DESCRIPTION  EXAMPLES  SEE ALSO  AUTHOR  SOURCE CODE 

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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

AUTHOR

Anna Petrasova, NCSU GeoForAll Lab, developed during GSoC 2014.

SOURCE CODE

Available at: r3.gradient source code (history)

Latest change: Tuesday Dec 17 20:17:20 2024 in commit: d962e90c026708a4815ea2b9f46c0e84c17de22d

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