r.param.scale(1grass) | GRASS GIS User's Manual | r.param.scale(1grass) |
r.param.scale - Extracts terrain parameters from a
DEM.
Uses a multi-scale approach by taking fitting quadratic parameters to any size
window (via least squares).
raster, geomorphology, terrain, elevation, landform
r.param.scale
r.param.scale --help
r.param.scale [-c] input=name
output=name [slope_tolerance=float]
[curvature_tolerance=float] [size=integer]
[method=string] [exponent=float]
[zscale=float] [--overwrite] [--help]
[--verbose] [--quiet] [--ui]
r.param.scale extracts terrain parameters from a digital elevation model. Uses a multi-scale approach by fitting a bivariate quadratic polynomial to a given window size using least squares.
The module calculates the following parameters (terminology is from Wood, 1996 with related terminology used in other GRASS modules listed in brackets):
In r.param.scale the direction of maximum gradient (considered downslope) is stored as (West is 0 degree, East is +/- 180 degree):
The next commands will create a geomorphological map of the
Spearfish sample dataset region:
g.region raster=elevation.10m -p r.param.scale in=elevation.10m output=morphology method=feature size=9
Figure: Geomorphological map of a subregion in the Spearfish (SD) area
Fix bug when `constrain through central cell’ option selected. Create color tables for all output files (presently only on features).
r.geomorphon, r.slope.aspect
jwo@le.ac.uk - ASSIST’s home
Update to FP 3/2002: L. Potrich, M. Neteler, S. Menegon (ITC-irst)
Available at: r.param.scale source code (history)
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