ОПИСАНИЕ
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.
СМ. ТАКЖЕ
r.topmodel,
r.water.outlet,
r.mapcalc
ССЫЛКА
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.
АВТОРЫ
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: 2007-01-17 10:35:29 -0600 (Ср, 17 янв 2007) $
Автор перевода