1r.clump(1) Grass User's Manual r.clump(1)
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6 r.clump - Recategorizes data in a raster map layer by grouping cells
7 that form physically discrete areas into unique categories.
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10 raster
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13 r.clump
14 r.clump help
15 r.clump [-q] input=name output=name [title="string"] [--overwrite]
16 [--verbose] [--quiet]
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18 Flags:
19 -q
20 Run quietly
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22 --overwrite
23 Allow output files to overwrite existing files
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25 --verbose
26 Verbose module output
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28 --quiet
29 Quiet module output
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31 Parameters:
32 input=name
33 Name of input raster map
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35 output=name
36 Name for output raster map
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38 title=
39 Title, in quotes
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42 r.clump finds all areas of contiguous cell category values in the input
43 raster map layer name. It assigns a unique category value to each such
44 area ("clump") in the resulting output raster map layer name. Category
45 distinctions in the input raster map layer are preserved. This means
46 that if distinct category values are adjacent, they will NOT be clumped
47 together. (The user can run <A HREF="r.reclass.html">r.reclass prior
48 to r.clump to recategorize cells and reassign cell category values.)
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51 r.clump moves a 2x2 matrix over the input raster map layer. The lower
52 right-hand corner of the matrix is grouped with the cells above it, or
53 to the left of it (diagonal cells are not considered.)
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55 r.clump works properly with raster map layers that contain only "fat"
56 areas (more than a single cell in width). Linear elements (lines that
57 are a single cell wide) may or may not be clumped together depending on
58 the direction of the line - horizontal and vertical lines of cells are
59 considered to be contiguous, but diagonal lines of cells are not con‐
60 sidered to be contiguous and are broken up into separate clumps.
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62 A random color table and other support files are generated for the out‐
63 put raster map layer.
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66 r.average
67 r.buffer
68 r.grow
69 r.mapcalc
70 r.mfilter
71 r.neighbors
72 r.to.vect
73 r.reclass
74 r.statistics
75 r.support
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78 Michael Shapiro, U.S. Army Construction Engineering Research Laboratory
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80 Last changed: $Date: 2008-02-26 17:36:59 +0100 (Tue, 26 Feb 2008) $
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82 Full index
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84 © 2003-2008 GRASS Development Team
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88GRASS 6.3.0 r.clump(1)