Hi Markus, > I assume the global mangroves map should not have overlapping > polygons, therefore as long as there are overlapping areas and/or the > number of centroids is not equal to the number of input polygons, more > cleaning is needed.
How critical is it that the number of input polygons = number of centroids? For example, I've imported a a different shapefile with 6842 input polygons and after importing (with 1e-12 snapping threshold) there are 6800 centroids. Further cleaning does not change the topology. Also can I ignore the areas without centroids? Number of nodes: 17265 Number of primitives: 20687 Number of points: 0 Number of lines: 0 Number of boundaries: 13887 Number of centroids: 6800 Number of areas: 10521 Number of isles: 7099 Number of areas without centroid: 3721 Would I be correct in saying that a layer is topologically correct and needs no further cleaning provided, there are no (i.e, zero): 1. overlapping areas; 2. incorrect boundaries; 3. centroids outside area; and 4. duplicate centroids. While: 5. areas without centroids can be ignored. Many thanks, for your feedback. Richard -- 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-tp5052007p5052530.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
