r.clump - Recategorizes data in a raster map layer by grouping cells that form physically discrete areas into unique categories.
r.clump [-q] input=name output=name [title="string"] [--overwrite]
- Force overwrite of output files
- Name of input raster map
- Name for output raster map
- Title, in quotes
r.clump finds all areas of contiguous cell category values in the
input raster map layer name. It assigns a unique category value
to each such area ("clump") in the resulting output raster map layer
name. If the user does not provide input and output map layer
names on the command line, the program will prompt the user for these names,
using the standard parser interface (see manual
entry for parser).
Category distinctions in the input raster map layer are preserved. This
means that if distinct category values are adjacent, they will NOT be
clumped together. (The user can run r.reclass prior to r.clump to
recategorize cells and reassign cell category values.)
r.clump moves a 2x2 matrix over the input raster map layer.
The lower right-hand corner of the matrix is grouped with the cells above it,
or to the left of it.
(Diagonal cells are not considered.)
r.clump works properly with raster map layers that
contain only "fat" areas (more than a single cell in
width). Linear elements (lines that are a single cell
wide) may or may not be clumped together depending on the
direction of the line -- horizontal and vertical lines of
cells are considered to be contiguous, but diagonal lines
of cells are not considered to be contiguous and are broken
up into separate clumps.
A random color table and other support files are
generated for the output raster map layer.
Michael Shapiro, U.S. Army Construction Engineering
Last changed: $Date: 2006/04/18 15:14:26 $
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