#1360: v.net.centrality: closeness is calculated per subcomponent, but should
(at
least optionally) be global
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Reporter: mlennert | Owner: grass-dev@…
Type: enhancement | Status: new
Priority: normal | Milestone: 7.0.0
Component: LibVector | Version: svn-develbranch6
Keywords: v.net.centrality closeness | Platform: All
Cpu: Unspecified |
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In v.net.centrality, closeseness of a node is calculated as the mean cost
to reach all other nodes. However, this obviously causes problems when
some nodes are disconnected from the bulk of the network. See areas
circled in yellow on the attached example map (result of v.net.centrality
-a on spearfish roads map).
This means that some very disconnected points get high levels of closeness
centrality because only their local subnetwork is taken into account.
Alternatives exist and one is described [http://toreopsahl.com/2010/03/20
/closeness-centrality-in-networks-with-disconnected-components/ here]. It
would be nice to have at least the option to use this alternative measure
of closeness.
Moritz
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Ticket URL: <http://trac.osgeo.org/grass/ticket/1360>
GRASS GIS <http://grass.osgeo.org>
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