>> Hello everyone, >> >> did anyone else ever work on simplifying the polylines for >> low zoom -rendering or similar purposes? >> Any algorithms, websites or books that may help me? >> > > There's been a small amount of work on this in mapnik-rendering > circles, but mainly using postgis' simplify(linestring, integer) > function. I don't have info from anyone who's looked into it further > from an algorithm point of view. >
Check out the google maps encoded polylines or vertex reduction algorithms. I (and many others) have written algorithms to say which levels a polyline point should be visible at on google maps. e.g. (not mine!) http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/algorithm.html _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
