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, fractal

SYNOPSIS

r.surf.fractal
r.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.rst

AUTHOR

Jo Wood, Midlands Regional Research Laboratory (ASSIST), University of Leicester

Last changed: $Date: 2008-12-06 23:39:43 +0100 (sab, 06 dic 2008) $

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