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NAMEr.surf.fractal - Creates a fractal surface of a given fractal dimension. KEYWORDSraster, surface, fractal SYNOPSISr.surf.fractal
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DESCRIPTIONr.surf.fractal creates a fractal surface of a given fractal dimension. It uses the spectral synthesis method. The module can create intermediate layers showing the build up of different spectral coefficients (see Saupe, pp.106-107 for an example of this). This module generates naturally looking synthetical elevation models (DEM). NOTEThis module requires the FFTW library for computing Discrete Fourier Transforms. EXAMPLEGenerate surface using fractals in selected region, set color
table and display with shade.
g.region -p raster=elevation r.surf.fractal output=fractals r.colors map=fractals color=byr r.relief input=fractals output=fractals_shade d.mon wx0 d.shade shade=fractals_shade color=fractals b=50 Artificial surface created with fractals
# D=2.0005 g.region -dp r.surf.fractal out=dem_d2_0005 dim=2.0005 r.info -r dem_d2_0005 r.mapcalc "dem_d2_0005_final = 1.0 * dem_d2_0005 + abs(min(dem_d2_0005))" r.colors dem_d2_0005_final color=terrain r.slope.aspect dem_d2_0005_final aspect=dem_d2_0005_final_as # D=2.90 r.surf.fractal out=dem_d2_90 dim=2.90 r.info -r dem_d2_90 r.mapcalc "dem_d2_90_final = 1.0 * dem_d2_90 + abs(min(dem_d2_90))" r.colors dem_d2_90_final color=terrain r.slope.aspect dem_d2_90_final aspect=dem_d2_90_final_as Artificial DEMs created with fractals:
REFERENCESSaupe, 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 ALSOr.surf.contour, r.surf.idw, r.surf.gauss, r.surf.random, v.surf.idw, v.surf.rst AUTHORJo Wood, Midlands Regional Research Laboratory (ASSIST), University of Leicester SOURCE CODEAvailable at: r.surf.fractal source code (history) Latest change: Friday Oct 25 16:16:09 2024 in commit: 4ea983fff87951516b6e4578a0527e3b10f04643 Main index | Raster index | Topics index | Keywords index | Graphical index | Full index © 2003-2025 GRASS Development Team, GRASS GIS 8.4.1 Reference Manual
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