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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] [--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

Table of contents

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
r.random.surface example (min: 10; max: 100)
Figure: Random surface example (min: 10; max: 100)

With the histogram tool the cell values versus count can be shown.

r.random.surface example histogram (min: 10; max: 100)
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)


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