r.surf.random.1grass - Man Page

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

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=nameÂ [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.

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)

Author

Jo Wood
Midlands Regional Research Laboratory (ASSIST)
University of Leicester
October 1991

Source Code

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

Accessed: Saturday Nov 09 07:55:08 2024

Info

GRASS 8.4.0 GRASS GIS User's Manual