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man page of r.topidx

r.topidx: Creates topographic index [ln(a/tan(beta))] map from elevation map.


r.topidx - Creates topographic index [ln(a/tan(beta))] map from elevation map.
r.topidx r.topidx help r.topidx input=name output=name [--overwrite] [--verbose] [--quiet] Flags: --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output Parameters: input=name Input elevation map output=name Output topographic index map


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.


r.topmodel, r.water.outlet, r.mapcalc


Moore, I.D., R.B. Grayson, and A.R. Ladson, 1991. Digital terrain modeling: A review of hydrological, geomorphological, and biological applications. Hydrol. Processes 5:3-30.


Main algorithm sources are rewritten from GRIDATB.FOR. Thanks to Keith Beven. GRASS port by Huidae Cho Hydro Laboratory, Kyungpook National University, South Korea Last changed: $Date: 2008-05-16 21:09:06 +0200 (Fri, 16 May 2008) $ Full index (C) 2003-2010 GRASS Development Team R.TOPIDX(1)

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