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
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.
r.water.outlet
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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GRASS Development Team,
GRASS GIS 7.4.1svn Reference Manual