Provided by: grass-doc_8.3.0-1_all
NAME
r.buffer.lowmem - Creates a raster map showing buffer zones surrounding 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. "distance" 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 Laboratory Low-memory Python version by Glynn Clements
SOURCE CODE
Available at: r.buffer.lowmem source code (history) Accessed: Tuesday Jun 27 11:14:33 2023 Main index | Raster index | Topics index | Keywords index | Graphical index | Full index © 2003-2023 GRASS Development Team, GRASS GIS 8.3.0 Reference Manual