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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] [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 for random number generator
The same seed can be used to obtain same results or random seed can be generated by other means.

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)

Latest change: Sunday Jun 30 20:21:51 2024 in commit: 837b7967f5d98d5043b469862b6083620ae04070


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