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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
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.
# 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
r3.flow,
r.flow
Anna Petrasova,
NCSU OSGeoREL,
developed during GSoC 2014.
SOURCE CODE
Available at:
r3.gradient source code
(history)
Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843
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© 2003-2024
GRASS Development Team,
GRASS GIS 8.3.3dev Reference Manual