NAME

r.param.scale - Calculates surface parameters and features from a DEM.
(GRASS Raster Program)

SYNOPSIS

r.param.scale
r.param.scale help
r.param.scale [-c] in=name out=name [tol=value] [size=value] [param=name]

DESCRIPTION

The GRASS program r.param.scale can be used to calculate surface parameters and features from a DEM.

PROGRAM OPTIONS

r.param.scale can be run either non-interactively or interactively. In non-interactive use, the user must specify the names of the raster map layers to be used for input and output on the command line, using the form in=name out=name (where each name is the name of a raster map layer to be read in resp. to be generated.

Flags:

-c
If set, r.param.scale constrains model through central window cell

Parameters:

in=name: Raster surface layer to process

out =name: Output raster layer containing morphometric parameter

s_tol =value: Slope tolerance value that defines a `flat' surface (degrees) - default: 1.0

c_tol=value: Curvature tolerance value that defines a `planar' surface - default: 1.0

size =value: Size of processing window (odd number only) - default: 3

param=value: Morphometric parameter to calculate options: elev, slope, aspect, profc, planc, longc, crosc, minic, maxic, feature - default: elev

exp =value: Exponent for distance weighting (0.0-4.0) 1 implies a linear decay, 2 an inverse distance squared decay - default: 0.0 (no distance decay).

zscale =value: Vertical scaling factor - default: 1.0
With:
     elev:     Generalised elevation value.
     slope:    Maximum gradient at a point.
     aspect:   Direction of maximum gradient.
     profc:    Profile convexity (vertical in direction of steepest slope).
     planc:    Plan convexity (contour curvature).
     crosc:    Cross sectional convexity (tangent to contours, downslope).
     longc:    Longitudinal convexity (perpendicular to contours downslope).
     minic:    Minimum convexity.
     maxic:    Maximum convexity.
     feature:  Morphometric features:
                 peaks, ridges, passes, channels, pits and planes.

SEE ALSO

d.param.scale
parser

AUTHOR

Jo Wood, PROJECT ASSIST,
Department of Geography, University of Leicester