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r.surf.fractal.1grass
Langue: en
Version: 334692 (ubuntu - 24/10/10)
Section: 1 (Commandes utilisateur)
NAME
r.surf.fractal - Creates a fractal surface of a given fractal dimension.KEYWORDS
raster, DEM, fractalSYNOPSIS
r.surf.fractalr.surf.fractal help
r.surf.fractal output=name [dimension=float] [number=integer] [--overwrite] [--verbose] [--quiet]
Flags:
- --overwrite
Allow output files to overwrite existing files- --verbose
Verbose module output- --quiet
Quiet module output
Parameters:
- output=name
Name for output raster map- dimension=float
Fractal dimension of surface (2 < D < 3)
Default: 2.05- number=integer
Number of intermediate images to produce
Default: 0
DESCRIPTION
r.surf.fractal 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).Use this module to generate naturally looking synthetical elevation models (DEM).
NOTE
This module requires the FFTW library for computing Discrete Fourier Transforms.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.SEE ALSO
r.surf.contour, r.surf.idw, r.surf.gauss, r.surf.random, r.surf.idw2, v.surf.idw, v.surf.rstAUTHOR
Jo Wood, Midlands Regional Research Laboratory (ASSIST), University of LeicesterLast changed: $Date: 2008-12-06 23:39:43 +0100 (sab, 06 dic 2008) $
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