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

AUTHORS

       Anna Petrasova, NCSU OSGeoREL, developed during GSoC 2014.

SOURCE CODE

       Available at: r3.gradient source code (history)

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