Hi, Would my understanding be correct in that a given 'geographical area' displayed in the Map Display could be counted as multiple 'areas' in the v.build console output due to multiple centroids being associated with the given area.
For instance, I imported a vector shapefile with the following topology: Number of nodes: 1001 Number of primitives: 1322 Number of points: 0 Number of lines: 0 Number of boundaries: 1088 Number of centroids: 234 Number of areas: 323 Number of isles: 2 Number of duplicate centroids: 13 Number of areas without centroid: 102 With closer inspection of the displayed file, there are clearly 10 delineated areas, certainly not 323. The majority of centroids seem to sit on boundary lines. It appears that each 'area' counted in the v.build output represents a single centroid AND a closed ring of boundaries* where an actual geographical area can be counted multiple times due to multiple centroids sitting on its boundaries. In other words, the number of 'areas' in v.build output does not necessarily represent different geographical areas? Thanks for your feedback. Richard *According to the GRASS vector introduction, an area is described as 'the topological composition of a closed ring of boundaries and optionally a centroid'. http://grass.osgeo.org/grass64/manuals/vectorintro.html -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Query-number-of-areas-reported-in-v-build-output-does-not-necessarily-represent-different-geographics-tp5052007.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
