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)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual