#1654: v.extract: allow direct transformation of centroids to polygons -------------------------+-------------------------------------------------- Reporter: mlennert | Owner: grass-dev@… Type: enhancement | Status: new Priority: normal | Milestone: 7.0.0 Component: Default | Version: unspecified Keywords: | Platform: Unspecified Cpu: Unspecified | -------------------------+-------------------------------------------------- A recurrent task is to extract centroids from polygons and to use them as points in further analysis. Currently, one has to do this in two steps:
{{{ v.extract in=polygonmap out=centroidmap type=centroid v.type in=centroidmap out=pointmap type=centroid,point }}} As this is IMHO such a basic operation, it would be great if v.extract could directly create a point layer. This could be implemented in different ways (in my order of preference): 1) If map contains polygons, but no points and type=point is given, then extract the centroids as points, if type=centroid extract as centroids. 2) If type=centroid is given, extract as points by default, but allow to extract as centroids by use of a flag 3) If type=centroid is given, extract as centroids by default, but allow to extract as points by use of a flag A problem obviously might occur if a map contains a mix of polygons and points... Moritz -- Ticket URL: <http://trac.osgeo.org/grass/ticket/1654> GRASS GIS <http://grass.osgeo.org>
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