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]
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17   Flags:
18       --overwrite
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20   Parameters:
21       input=name
22           Name of input vector map
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24       output=name
25           Name for output vector map
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27       option=string
28           Action to be taken Options: add Default: add
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30       layer=integer
31           Layer number Default: 1
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33       cat=integer
34           Category number starting value Default: 1
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36       step=integer
37           Category increment Default: 1
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DESCRIPTION

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

61        v.category
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AUTHORS

64       module: M. Hamish Bowman, Dept. Marine Science, Otago  University,  New
65       Zealand
66       help page: Trevor Wiens
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68       Last changed: $Date: 2007/05/24 08:07:30 $
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70       Full index
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74GRASS 6.2.2                                                     v.centroids(1)