This is the command r.topidxgrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
NAME
r.topidx - Creates a topographic index (wetness index) raster map from an elevation
raster map.
KEYWORDS
raster, hydrology, wetness
SYNOPSIS
r.topidx
r.topidx --help
r.topidx input=name output=name [--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 elevation raster map
output=name [required]
Name for output topographic index raster map
DESCRIPTION
r.topidx creates topographic index (wetness index), ln(a/tan(beta)), map from elevation
map
where
a: the area of the hillslope per unit contour length that drains through any point,
tan(beta): the local surface topographic slope (delta vertical) / (delta horizontal).
Input maps may have NULL values. For example, if you have a MASK for a watershed (basin
map from r.water.outlet), the following command will create a masked elevation map
(belev):
r.mapcalc "belev = if(isnull(basin), basin, elev)"
r.stats -Anc prints out averaged statistics for topographic index.
Use r.topidxgrass online using onworks.net services
