r.wateroutlet.lessmem - GRASS GIS manual

NAME

r.wateroutlet.lessmem - Creates watershed basins from a drainage direction map.

KEYWORDS

SYNOPSIS

r.wateroutlet.lessmem

r.wateroutlet.lessmem --help

r.wateroutlet.lessmem input=name output=name coordinates=east,north [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

--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:

input=name [required]: Name of input drainage direction map
output=name [required]: Name for output watershed basin map
coordinates=east,north [required]: Coordinates of outlet point

DESCRIPTION
SEE ALSO
AUTHOR

DESCRIPTION

r.wateroutlet.lessmem is a modified version of r.water.outlet and requires about one third of memory compared to the original module. Input drainage direction information is stored as 4-bit segments in the buffer and output basin result is stored as 1-bit data. Because of heavy bitwise operations, there may be some performance penalty depending on the size of the input map. Other than memory management, this module uses the same interface and algorithm in r.water.outlet, so please refer to r.water.outlet for more details.

AUTHOR

Huidae Cho
based on r.water.outlet

SOURCE CODE

Available at: r.wateroutlet.lessmem source code (history)