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| README | vor 17 Jahren | |
| arc.to.gridatb.pl | vor 13 Jahren | |
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README
Main algorithm sources are rewritten from GRIDATB.FOR.
GRIDATB.FOR is available from http://www.es.lancs.ac.uk/hfdg/topmodel.html.
Thanks to Keith Beven.
[r.topidx]
creates topographic 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)
Elevation map need not to be rectangular if study basin was already determined.
Non-interesting region may have NULL values. Study basin map can be taken
from r.water.outlet then the following r.mapcalc statements will create
study basin extracted elevation map.
r.mapcalc "belev = if(isnull(basin), basin, elev)"
GRIDATB.FOR is available from http://www.es.lancs.ac.uk/hfdg/topmodel.html.
Thanks to Keith Beven.
[r.topidx]
creates topographic 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)
Elevation map need not to be rectangular if study basin was already determined.
Non-interesting region may have NULL values. Study basin map can be taken
from r.water.outlet then the following r.mapcalc statements will create
study basin extracted elevation map.
r.mapcalc "belev = if(isnull(basin), basin, elev)"