r.buffer.lowmem(1grass) GRASS GIS User's Manual r.buffer.lowmem(1grass)
NAME
r.buffer.lowmem - Creates a raster map showing buffer zones surround-
ing cells that contain non-NULL category values.
This is the low-memory alternative to the classic r.buffer module.
KEYWORDS
raster, buffer
SYNOPSIS
r.buffer.lowmem
r.buffer.lowmem --help
r.buffer.lowmem [-z] input=name output=name distances=float[,float,...]
[units=string] [--overwrite] [--help] [--verbose] [--quiet]
[--ui]
Flags:
-z
Ignore zero (0) data cells instead of NULL cells
--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 raster map
output=name [required]
Name for output raster map
distances=float[,float,...] [required]
Distance zone(s)
units=string
Units of distance
Options: meters, kilometers, feet, miles, nautmiles
Default: meters
DESCRIPTION
r.buffer.lowmem creates a new raster map showing buffer (a.k.a. "dis-
tance" or "proximity") zones around all cells that contain non-NULL
category values in an existing raster map. The distances of buffer
zones from cells with non-zero category values are user-chosen.
This is the low-memory alternative to the classic r.buffer module. It
is much slower than the classic version, but will run on massive raster
maps without using a lot of RAM. If your raster map is larger than
32000x32000 cells on a system with 1 GB of RAM, or larger than
90000x90000 cells on a system with 8 GB of RAM, consider using this
module.
For more info see manual of r.buffer.
EXAMPLE
In the following example, the buffer zones would be (in the default
units of meters): 0-100, 101-200, 201-300, 301-400 and 401-500.
r.buffer.lowmem input=roads output=roads.buf distances=100,200,300,400,500
Result:
r.category input=roads.buf
1 distances calculated from these locations
2 0-100 meters
3 100-200 meters
4 200-300 meters
5 300-400 meters
6 400-500 meters
SEE ALSO
g.region, r.buffer, r.cost, r.grow.distance, r.mapcalc, r.reclass,
v.buffer
AUTHORS
Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
James Westervelt, U.S. Army Construction Engineering Research Labora-
tory
Low-memory Python version by Glynn Clements
SOURCE CODE
Available at: r.buffer.lowmem source code (history)
Accessed: unknown
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GRASS 7.8.7 r.buffer.lowmem(1grass)
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