Hi, I'm trying to implement some projection-code for a project of mine.. But I have some trouble with the Mercator projection.
I understood that the projection we use in the slippy map is called Sphere / Web-Mercator, or EPSG:900913 or EPSG:3785 and is also used by Google, MS, Yahoo and so on.. So there is some description on MSDN (http://msdn.microsoft.com/en-us/library/bb259689.aspx) which says: y = 0.5 – log((1 + sin(Latitude)) / (1 – sin(Latitude))) / (4 * pi) on some other pages and wikipedia I found that one: y = 0.5 * ln( (1 + sin(Latitude)) / (1 – sin(Latitude)) ) where this is called the projection for GoogleMaps. So - this is not the same. I understand that the first one is somehow clipped to Lat +-85.05... and then scaled to 0 to 1. Huh, the second one. what scale is this? I can't figure out how to use it.. Can someone point me into the right direction? Something to read? Regards, Dominik _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
