Tobias Wendorff wrote: > This means: Whenever you zoom out of a map, there's lot of details, > you don't need at all. The SQL-query grabs all this data of course.
Mapnik does an explicit && with the bbox of the area to be rendered. That may still amount to a lot of geometries returned when you are rendering low zoom tiles, but it by no means grabs *all* the data. > The result will be: Smoothed lines (or curves) with less nodes. > These will be faster to grab from DB and the data will be faster > to render. Are you factoring in the time it takes to do the simplification? Another trick used in osm2pgsql + osm.xml is to put all ways into a table (planet_osm_line) and parallel to that place only those ways which are interesting for low zoom tiles into a separate table (planet_osm_roads). This means that for low zooms it only has to query the much smaller _roads table, which is faster to scan. -- Lennard _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
