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)

       Accessed: Friday Apr 04 01:20:03 2025

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       © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual

GRASS 8.4.1                                                                                  r3.gradient(1grass)