.TH d.param.scale 1 "" "" "" ""
.SH NAME
\*Ld.param.scale\*O  - Calculates surface parameters and features 
from a DEM and displays them in GRASS monitor. It allows interactive indentification of
terrain parameters and features with a mouse. Reports 
membership classes for variable window sizes and their
variance or entropy.
.br
(GRASS Raster Program) 
.SH SYNOPSIS
\*Ld.param.scale\*O
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\*Ld.param.scale help\*O 
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\*Ld.param.scale\*O [\*L-c\*O] [\*L-f\*O] [\*L-t\*O] \*Lin=\*Oname
\*Lout=\*Oname [s_tol=value] [c_tol=value] [size=value]
[param=name]  [exp=value] [zscale=value]
.SH DESCRIPTION
The GRASS program d.param.scale can be used to identify
interactively terrain parameters and features with a mouse. Reports 
membership classes for variable window sizes and their
variance or entropy.
.SH PROGRAM OPTIONS
d.param.scale can be run either non-interactively or
interactively.  In non-interactive use, the user must
specify the name of the raster map layer to be used for input
on the command line, using the
form \*Lin=\*Oname (where
the  name is the name of a raster map layer to be
input. 
.PP
.SH Flags:
.VL 4m
.LI "\*L-c\*O
If set, d.param.scale  constrains model through central window cell
.LE
.VL 4m
.LI "\*L-f\*O
If set, d.param.scale  fixes the axis scale
.LE
.VL 4m
.LI "\*L-t\*O
If set, d.param.scale creates text output of results
.LE
.PP
.SH Parameters:
.VL 4m
.LI "\*Lin=\*Oname: Raster surface layer to interrogate
.LI "\*L s_tol =\*Ovalue: Slope tolerance value
that defines a `flat' surface (degrees) - default: 1.0 
.LI "\*L c_tol=\*Ovalue: Curvature tolerance value that defines a `planar'
surface -  default: 1.0 
.LI "\*L size =\*Ovalue: Size of
processing window (odd number only) - default: 15
.LI "\*L param=\*Ovalue: Morphometric parameter to calculate options:
elev, slope, aspect, profc, planc, longc, crosc, minic, maxic,
feature, resid, moran, geary
- default: elev 
.LI "\*L exp =\*Ovalue: 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).  
.LI "\*L zscale =\*Ovalue: Vertical scaling factor - default: 1.0
With:
\*C
.DS
     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.
     resid:
     moran: Moran statistics
     geary:
.DE
\*O
.LE
.SH SEE ALSO
\*Lr.param.scale\*O
.br
\*Lparser\*O
.SH AUTHOR
Jo Wood, PROJECT ASSIST, 
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Department of Geography, University of Leicester
.SH REFERENCE
Wood, J. (1996): The Geomorphological characterisation of Digital Elevation
Models. Diss., Department of Geography, University of Leicester, U.K. 
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online at:
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www.geog.le.ac.uk/jwo/research/dem_char/thesis/index.html