r.surf.random - GRASS GIS manual

NAME

r.surf.random - Produces a raster surface map of uniform random deviates with defined range.

KEYWORDS

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.

DESCRIPTION
EXAMPLE
SEE ALSO
AUTHOR

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.

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

Figure: Histogram of random surface example (min: 10; max: 100)

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: Friday Apr 05 16:24:05 2024 in commit: e59203466773b61eda9e18a9a9f923f824e635ba