1v.centroids(1)                Grass User's Manual               v.centroids(1)
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NAME

6       v.centroids  - Adds missing centroids to closed boundaries.
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KEYWORDS

9       vector, centroid, area
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SYNOPSIS

12       v.centroids
13       v.centroids help
14       v.centroids  input=name  output=name  [option=string]   [layer=integer]
15       [cat=integer]   [step=integer]   [--overwrite]  [--verbose]  [--quiet]
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17   Flags:
18       --overwrite
19           Allow output files to overwrite existing files
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21       --verbose
22           Verbose module output
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24       --quiet
25           Quiet module output
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27   Parameters:
28       input=name
29           Name of input vector map
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31       output=name
32           Name for output vector map
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34       option=string
35           Action to be taken
36           Options: add
37           Default: add
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39       layer=integer
40           Layer number
41           Default: 1
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43       cat=integer
44           Category number starting value
45           Default: 1
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47       step=integer
48           Category increment
49           Default: 1
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DESCRIPTION

52       GRASS defines vector areas as composite entities consisting of a set of
53       closed  boundaries and a centroid. The attribute information associated
54       with that area is linked to the centroid. The v.centroids  module  adds
55       centroids to closed boundaries in the input file and assigns a category
56       number to them. The starting value as well as the increment size may be
57       set using optional parameters.
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59       Multiple  attributes  may  be  linked to a single vector entity through
60       numbered fields referred to as layers. Refer  to  v.category  for  more
61       details, as v.centroids is simply a frontend to that module.
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63       The  boundary  itself is often stored without any category reference as
64       it can mark the border between two adjacent areas.  Thus  it  would  be
65       ambiguous as to which feature the attribute would belong. In some cases
66       it may, for example, represent a road between two parcels of  land.  In
67       this  case it is entirely appropriate for the boundary to contain cate‐
68       gory information.
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70       (GRASS Shell Script)
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SEE ALSO

73        v.category
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AUTHORS

76       module: M. Hamish Bowman, Dept. Marine Science, Otago  University,  New
77       Zealand
78       help page: Trevor Wiens
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80       Last changed: $Date: 2006-08-31 13:46:24 +0200 (Thu, 31 Aug 2006) $
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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                                                     v.centroids(1)