.TH r.surf.fractal 1grass "" "GRASS 6.4.2" "Grass User's Manual"
.SH NAME
\fI\fBr.surf.fractal\fR\fR  - Creates a fractal surface of a given fractal dimension.
.SH KEYWORDS
raster, DEM, fractal
.SH SYNOPSIS
\fBr.surf.fractal\fR
.br
\fBr.surf.fractal help\fR
.br
\fBr.surf.fractal output\fR=\fIname\fR  [\fBdimension\fR=\fIfloat\fR]   [\fBnumber\fR=\fIinteger\fR]   [--\fBoverwrite\fR]  [--\fBverbose\fR]  [--\fBquiet\fR] 
.SS Flags:
.IP "\fB--overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB--verbose\fR" 4m
.br
Verbose module output
.IP "\fB--quiet\fR" 4m
.br
Quiet module output
.PP
.SS Parameters:
.IP "\fBoutput\fR=\fIname\fR" 4m
.br
Name for output raster map
.IP "\fBdimension\fR=\fIfloat\fR" 4m
.br
Fractal dimension of surface (2 < D < 3)
.br
Default: \fI2.05\fR
.IP "\fBnumber\fR=\fIinteger\fR" 4m
.br
Number of intermediate images to produce
.br
Default: \fI0\fR
.PP
.SH DESCRIPTION
\fBr.surf.fractal\fR creates a fractal surface of a given fractal
dimension. Uses spectral synthesis method. Can create intermediate layers
showing the build up of different spectral coefficients (see Saupe,
pp.106-107 for an example of this).
.PP
Use this module to generate naturally looking synthetical elevation models
(DEM).
.SH NOTE
This module requires the FFTW library
for computing Discrete Fourier Transforms.
.SH REFERENCE
Saupe, D. (1988) Algorithms for random fractals, in Barnsley M., 
Devaney R., Mandelbrot B., Peitgen, H-O., Saupe D., and Voss R.
(1988) The Science of Fractal Images, Ch. 2, pp.71-136. London:
Springer-Verlag.
.SH SEE ALSO
\fIr.surf.contour\fR,
\fIr.surf.idw\fR,
\fIr.surf.gauss\fR,
\fIr.surf.random\fR,
\fIr.surf.idw2\fR,
\fIv.surf.idw\fR,
\fIv.surf.rst\fR
.SH AUTHOR
Jo Wood,
Midlands Regional Research Laboratory (ASSIST),
University of Leicester
.PP
\fILast changed: $Date: 2008-12-06 23:39:43 +0100 (Sat, 06 Dec 2008) $\fR
.PP
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.PP
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