|
NAMEr.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. KEYWORDSraster, bufferSYNOPSISr.buffer.lowmemr.buffer.lowmem --help r.buffer.lowmem [-z] input=name output=name distances=float[,float,...] [units=string] [--overwrite] [--help] [--verbose] [--quiet] [--ui] Flags:
Parameters:
DESCRIPTIONr.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. EXAMPLEIn 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=100,200,300,400,500Result: 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 ALSOg.region, r.buffer, r.cost, r.grow.distance, r.mapcalc, r.reclass, v.bufferAUTHORSMichael Shapiro, U.S. Army Construction Engineering Research LaboratoryJames Westervelt, U.S. Army Construction Engineering Research Laboratory Low-memory Python version by Glynn Clements SOURCE CODEAvailable at: r.buffer.lowmem source code (history)Main index | Raster index | Topics index | Keywords index | Graphical index | Full index © 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual
Visit the GSP FreeBSD Man Page Interface. |