r.surf.random(1grass)
| r.surf.random(1grass) | GRASS User's Manual | r.surf.random(1grass) |
NAME
r.surf.random - Produces a raster surface map of uniform random deviates with defined range.
KEYWORDS
raster, surface, random
SYNOPSIS
r.surf.random
r.surf.random --help
r.surf.random [-i] output=name
[min=float] [max=float]
[seed=integer] [--overwrite] [--help]
[--verbose] [--quiet] [--ui]
Flags:
- -i
-
Create an integer raster map - --overwrite
-
Allow output files to overwrite existing files - --help
-
Print usage summary - --verbose
-
Verbose module output - --quiet
-
Quiet module output - --ui
-
Force launching GUI dialog
Parameters:
- output=name [required]
-
Name for output raster map - min=float
-
Minimum random value
Default: 0 - max=float
-
Maximum random value
Default: 100 - seed=integer
-
Seed value for the random number generator
Using the same seed ensures identical results, while a randomly generated seed produces different outcomes in each run.
DESCRIPTION
r.surf.random produces a raster map layer of uniform random deviates whose range can be expressed by the user. It is essentially the same as r.surf.gauss, but uses a linear random number generator instead. It uses the random number generator drand48() or rand(), depending on the user’s platform.
EXAMPLE
g.region -p n=228500 s=215000 w=630000 e=645000 res=10 r.surf.random out=random min=0 max=100 # check result r.univar random
Figure: Random surface example (min: 10; max: 100)
With the histogram tool the cell values versus count can be shown.
Figure: Histogram of random surface example (min: 10; max: 100)
SEE ALSO
r.random.surface, r.surf.contour, r.surf.fractal, r.surf.gauss, r.surf.idw, v.surf.rst
AUTHOR
Jo Wood
Midlands Regional Research Laboratory (ASSIST)
University of Leicester
October 1991
SOURCE CODE
Available at: r.surf.random source code (history)
Accessed: Thursday Jun 18 12:48:33 2026
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