r.gradient - GRASS GIS manual

NAME

r.gradient - Create a gradient map

KEYWORDS

SYNOPSIS

r.gradient

r.gradient --help

r.gradient output=name direction=string range=integer[,integer,...] [percentile=float] [--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:

output=name [required]: Name for output raster map
direction=string [required]: The direction of gradient; Options: N-S, S-N, W-E, E-W, NW-SE, NE-SW
range=integer[,integer,...] [required]: Minimum and maximum values of gradient
percentile=float: Percentile to calculate (only for oblique gradient); Options: 0-100

DESCRIPTION
EXAMPLES
AUTHOR

DESCRIPTION

r.gradient create a gradient map. It is able to create horizontal, vertical and oblique gradient.

EXAMPLES

To calculate vertical gradient from North to South

  r.gradient output=gradient_ns range=0,50 direction=N-S

To calculate horizontal gradient from East to West

  r.gradient output=gradient_ea range=10,20 direction=E-W

To calculate oblique gradient from North-East to South-West you have to set also the percentile option to set the slope of the gradient.

  r.gradient output=gradient_oblique range=10,20 direction=NE-SW

AUTHOR

Luca Delucchi, Fondazione E. Mach (Italy)

Thanks to Johannes Radinger for the code of horizontal and vertical gradient

SOURCE CODE

Available at: r.gradient source code (history)