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v.centroids(1)		    GRASS GIS User's Manual		v.centroids(1)

NAME
       v.centroids  - Adds missing centroids to	closed boundaries.

KEYWORDS
       vector, centroid, area

SYNOPSIS
       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=nameA [required]
	   Name	of input vector	map
	   Or data source for direct OGR access

       output=nameA [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 ac-
	   cess	this is	the layer name.
	   Default: 1

       cat=integer
	   Category number starting value
	   Default: 1

       step=integer
	   Category increment
	   Default: 1

DESCRIPTION
       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 de-
       tails, 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 am-
       biguous 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	 cate-
       gory information.

EXAMPLES
       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

SEE ALSO
	v.category

AUTHORS
       module:	M.  Hamish Bowman, Dept. Marine	Science, Otago University, New
       Zealand
       help page: Trevor Wiens

SOURCE CODE
       Available at: v.centroids source	code (history)

       Main index | Vector index | Topics index	| Keywords index  |  Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.3 Reference	Manual

GRASS 7.8.3							v.centroids(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | AUTHORS | SOURCE CODE

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