## 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.