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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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