r.surf.random.1grass - Man Page

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]   [--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

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: Tuesday Mar 19 11:02:02 2024

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