On Sun, Apr 14, 2013 at 11:02 AM, RichardC <[email protected]> wrote: > Hi, > > I'm trying to remove a 'Number of centroids outside area' after > re-projecting a file. > > I've tried v.clean with various tools. including breaklines/boundaries, > break polygons, snap lines/boundaries. > > The intial imported shapefile did not display any errors, but the following > errors appeared on re-projecting the latter file: > > Building topology for vector map <as_bas_shp>... > Registering primitives... > 44546 primitives registered > 1680359 vertices registered > Building areas... > 13602 areas built > 2828 isles built > Attaching islands... > Attaching centroids... > Number of nodes: 33748 > Number of primitives: 44546 > Number of points: 0 > Number of lines: 0 > Number of boundaries: 30931 > Number of centroids: 13615 > Number of areas: 13602 > Number of isles: 2828 > *Number of centroids outside area: 13 > Number of duplicate centroids: 108 > Number of areas without centroid: 108* > > I can remove the duplicate centroids with v.clean (using bpol) but not the > centroids outside area. > > What would be the easiest way to remove, or at least to identify (filter > for) and manually assess?
The reason for these problems is one step earlier. Try to densify the vector boundaries with v.split, optionally followed by v.build.polylines before reprojecting it. See [0] for an example of the effect on reprojection. Markus M [0] http://trac.osgeo.org/grass/attachment/ticket/1918/dense_points_effect.png > > I've also tried outputting the errors using the error= command, but no > geometries are visible in the latter. > > Cheers, > Richard > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/Number-of-centroids-outside-area-difficulty-with-cleaning-tp5046717.html > Sent from the Grass - Users mailing list archive at Nabble.com. > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
