Provided by: grass-doc_7.6.0-1_all
v.centroids - Adds missing centroids to closed boundaries.
vector, centroid, area
v.centroids v.centroids --help v.centroids input=name output=name [option=string] [layer=string] [cat=integer] [step=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui] Flags: --overwrite Allow output files to overwrite existing files --help Print usage summary --verbose Verbose module output --quiet Quiet module output --ui Force launching GUI dialog Parameters: input=name [required] Name of input vector map Or data source for direct OGR access output=name [required] Name for output vector map option=string Action to be taken Options: add Default: add layer=string Layer number or name Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name. Default: 1 cat=integer Category number starting value Default: 1 step=integer Category increment Default: 1
GRASS defines vector areas as composite entities consisting of a set of closed boundaries and a centroid. The attribute information associated with that area is linked to the centroid. The v.centroids module adds centroids to closed boundaries in the input file and assigns a category number to them. The starting value as well as the increment size may be set using optional parameters. Multiple attributes may be linked to a single vector entity through numbered fields referred to as layers. Refer to v.category for more details, as v.centroids is simply a frontend to that module. The boundary itself is often stored without any category reference as it can mark the border between two adjacent areas. Thus it would be ambiguous as to which feature the attribute would belong. In some cases it may, for example, represent a road between two parcels of land. In this case it is entirely appropriate for the boundary to contain category information.
Create an area from a closed line using North Carolina sample dataset: v.type input=busroute11 output=busroute11_boundary from_type=line to_type=boundary v.centroids input=busroute11_boundary output=busroute11_area Figure: Creating area from closed line
module: M. Hamish Bowman, Dept. Marine Science, Otago University, New Zealand help page: Trevor Wiens Last changed: $Date: 2017-11-11 19:59:24 +0100 (Sat, 11 Nov 2017) $
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