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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.

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