On 30 January 2011 21:52, M∡rtin Koppenhoefer <dieterdre...@gmail.com> wrote: > This is a method of trying to extract useful data from an undefined > state making assumptions, but it is IMHO not how we should design our > data model. This would also mean that even with complete data for the > whole world, you would need endless processing if you wanted to > estimate the area covered by sand: for every area tagged surface=sand > you would only know it's real extension after subtracting all other > polygons with different surface-values (or with an assumed different > surface). > > You also seem to reduce this to a rendering problem. > > There can also be cases where a bigger polygon overlaps for a small > part a smaller polygon.
None of which is an issue, you can sort and display the information however you like, however in general it is a rendering problem and the way that was solved was to put the smaller polygons on top of the bigger ones which seems like a reasonable way to handle things to me. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
