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   r.param.scale extracts terrain parameters from a DEM. 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):
     * elev: Generalised elevation value (for resampling purposes at
       different scale)
     * slope: Magnitude of maximum gradient (steepest slope angle)
     * aspect: Direction of maximum gradient (steepest slope
       direction=flow direction)
     * profc or profile curvature (curvature intersecting with the plane
       defined by Z axis and maximum gradient direction). Positive values
       describe convex profile curvature, negative values concave profile
       curvature.
     * planc or plan curvature (horizontal curvature, intersecting with
       the XY plane)
     * longc or longitudinal curvature (profile curvature intersecting
       with the plane defined by the surface normal and maximum gradient
       direction)
     * crosc or cross-sectional curvature (tangential curvature
       intersecting with the plane defined by the surface normal and a
       tangent to the contour - perpendicular to maximum gradient
       direction)
     * maxic or maximum curvature (can be in any direction)
     * minic or minimum curvature (in direction perpendicular to the
       direction of of maximum curvature)
     * feature: Morphometric features: peaks, ridges, passes, channels,
       pits and planes

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   In r.param.scale the direction of maximum gradient (considered
   downslope) is stored as (West is 0 degree, East is +/- 180 degree):
     * 0..+180 degree from West to North to East
     * 0..-180 degree from West to South to East

   Note that the aspect map is calculated differently from
   [1]r.slope.aspect.

Still to do

   Fix bug when `constrain through central cell' option selected. Create
   color tables for all output files (presently only on features).

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   The next commands will create a morphology map of the Spearfish region:

g.region rast=elevation.10m -p
r.param.scale in=elevation.10m output=morphology param=feature

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   Java Code in [2]LandSerf that implements the same procedure

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   Wood, J. (1996): The Geomorphological characterisation of Digital
   Elevation Models. Diss., Department of Geography, University of
   Leicester, U.K.
   online at:
   [3]http://www.soi.city.ac.uk/~jwo/phd/

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    [4]jwo@le.ac.uk - [5]ASSIST's home

   Update to FP 3/2002: L. Potrich, M. Neteler, S. Menegon (ITC-irst)

   Last changed: $Date: 2006-07-15 13:23:43 -0500 (Сб, 15 иÑл 2006) $

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References

   1. file://localhost/root/tmp/2/fin/r.slope.aspect.html
   2. http://www.geog.le.ac.uk/jwo/research/LandSerf
   3. http://www.soi.city.ac.uk/~jwo/phd/
   4. mailto:jwo@le.ac.uk
   5. http://www.geog.le.ac.uk/assist/index.html