El Jueves, 17 de Septiembre de 2009, Manoj Bist escribió: > Hi, > > I need to render certain points on the map only at zoom levels greater than > some pre-determined zoom levels. Is there some way to filter those points > at undesired zoom levels. > > 1. Is there any way to specify the map zoom level(a number between 0 and > 17) in the <filter> </filter> tags? > 2. I found out that there are tags called<MinScaleDenominator> and > <MaxScaleDenominator> ? How do they correlate to the zoom levels?
I suppose we're talking epsg:900913 quadtiles here. Zoom level 0 relates to scale denominator 443744272. Each zoom level divides the scale denominator by two. z17? Its scale is 443744272/(2^17) or 443744272>>17. You just have to set up a rule that includes the scale denominator for that zoom level, and does not include the scale denominator of any other zoom level. Cheers, -- ---------------------------------- Iván Sánchez Ortega <[email protected]> You get along very well with everyone except animals and people. _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
