1r.buffer.lowmem(1)          GRASS GIS User's Manual         r.buffer.lowmem(1)
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NAME

6       r.buffer.lowmem   - Creates a raster map showing buffer zones surround‐
7       ing cells that contain non-NULL category values.
8       This is the low-memory alternative to the classic r.buffer module.
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KEYWORDS

11       raster, buffer
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SYNOPSIS

14       r.buffer.lowmem
15       r.buffer.lowmem --help
16       r.buffer.lowmem [-z] input=name output=name distances=float[,float,...]
17       [units=string]     [--overwrite]    [--help]    [--verbose]   [--quiet]
18       [--ui]
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20   Flags:
21       -z
22           Ignore zero (0) data cells instead of NULL cells
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24       --overwrite
25           Allow output files to overwrite existing files
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27       --help
28           Print usage summary
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30       --verbose
31           Verbose module output
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33       --quiet
34           Quiet module output
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36       --ui
37           Force launching GUI dialog
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39   Parameters:
40       input=name [required]
41           Name of input raster map
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43       output=name [required]
44           Name for output raster map
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46       distances=float[,float,...] [required]
47           Distance zone(s)
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49       units=string
50           Units of distance
51           Options: meters, kilometers, feet, miles, nautmiles
52           Default: meters
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DESCRIPTION

55       r.buffer.lowmem creates a new raster map showing buffer  (a.k.a.  "dis‐
56       tance"  or  "proximity")  zones  around all cells that contain non-NULL
57       category values in an existing raster  map.  The  distances  of  buffer
58       zones from cells with non-zero category values are user-chosen.
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60       This  is  the low-memory alternative to the classic r.buffer module. It
61       is much slower than the classic version, but will run on massive raster
62       maps  without  using  a  lot  of RAM. If your raster map is larger than
63       32000x32000 cells on a  system  with  1  GB  of  RAM,  or  larger  than
64       90000x90000  cells  on  a  system with 8 GB of RAM, consider using this
65       module.
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67       For more info see manual of r.buffer.
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EXAMPLE

70       In the following example, the buffer zones would  be  (in  the  default
71       units of meters): 0-100, 101-200, 201-300, 301-400 and 401-500.
72       r.buffer.lowmem input=roads output=roads.buf distances=100,200,300,400,500
73       Result:
74       r.category input=roads.buf
75             1       distances calculated from these locations
76             2       0-100 meters
77             3       100-200 meters
78             4       200-300 meters
79             5       300-400 meters
80             6       400-500 meters
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SEE ALSO

83         g.region,  r.buffer,  r.cost,  r.grow.distance, r.mapcalc, r.reclass,
84       v.buffer
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AUTHORS

87       Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
88       James Westervelt, U.S. Army Construction Engineering  Research  Labora‐
89       tory
90       Low-memory Python version by Glynn Clements
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SOURCE CODE

93       Available at: r.buffer.lowmem source code (history)
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95       Accessed: Mon Jun 20 16:47:44 2022
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97       Main  index  | Raster index | Topics index | Keywords index | Graphical
98       index | Full index
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100       © 2003-2022 GRASS Development Team, GRASS GIS 8.2.0 Reference Manual
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104GRASS 8.2.0                                                 r.buffer.lowmem(1)