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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=integer] [max=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=integer

Minimum random value
Default: 0
max=integer

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 essentialy 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.

Histogram of map generated with r.surf.random

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

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

Last changed: $Date: 2016-06-02 22:49:26 +0200 (Thu, 02 Jun 2016) $

SOURCE CODE

Available at: r.surf.random source code (history)

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© 2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual

GRASS 7.2.0