On 04/12/08 11:02, [EMAIL PROTECTED] wrote:
Hi list,is there an easy way to derive the centre of a cloud of points ? I am aware that the set of vector points ("cloud of points") could be used to stake out a polygon/boundary and use v.centroid etc etc to derive in turn its' centroid, but I am hoping for an easier solution .. ? This issue stems from working with v.to.db: currently it is not possible to upload xy coordinates for "multiploygons" into a database, i.e: Within a vector layer, there might be several boundaries which all share the same category value. If the "gravitational centre/ super-centroid" for these boundaries could be (conveniently) calculated, the v.to.db issue could be taken care of.
Why not use v.dissolve on these polygons and then get the centroids of the result ?
Another (very wild) guess: what about the mean of the coordinates of the individual polygons' centroids ?
Moritz _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
