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NAME

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

KEYWORDS

raster, hydrology, watershed

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

Table of contents

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.

SEE ALSO

r.water.outlet

AUTHOR

Huidae Cho
based on r.water.outlet

Last changed: $Date: 2016-05-16 13:02:37 +0200 (Mon, 16 May 2016) $

SOURCE CODE

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


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