I tried with a length of 1000 (which I guess should represent 1000m given the projection is Lambert Azimuthal Equal Area) and the with a length of 500 as shown below in more detail. The file I'm working with quite a large shapefile (50MB).
Topology of original imported shapefile (Lambert Azimuthal Equal Area): 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: 13615 Number of isles: 2817 Topology after v.split length=500 Attaching centroids... Number of nodes: 3274443 Number of primitives: 3285241 Number of points: 0 Number of lines: 0 Number of boundaries: 3271626 Number of centroids: 13615 Number of areas: 1218 Number of isles: 0 Number of incorrect boundaries: 3271358 Number of centroids outside area: 12397 Topology after v.build.polylines v.build.polylines input=as_bas_shp_vsplit500@PERMANENT output=as_bas_shp_vsplit500_vpoly 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: 13615 Number of isles: 2817 Topology after importing into CRS WGS84 (lat long) 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: 13601 Number of isles: 2828 *Number of incorrect boundaries: 26 Number of centroids outside area: 14* If the length=1000 for v.split (then followed by v.build.polylines), then the toplogy after importing into WGS84: 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: 109 Number of areas without centroid: 109* -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Number-of-centroids-outside-area-difficulty-with-cleaning-tp5046717p5046819.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
