# Open Street map tiling scheme

 1 This has to do with the projection being used. This is usually mercator, which doesn't use the same scale near the equator and near the poles. The tiles always split the previous zoom's image evenly, but that original image may be deformed in ways you didn't expect. However, it is possible to setup a slippymap with a different projection setting for mapnik. If you want all tiles from a given zoomlevel to span as many degrees latitude as longitude, try the equirectangular projection. However, remember that no projection is perfect, and you'll need to deal with deformations one way or another. One way to sidestep the deformation problem is to use a 3D renderer like marble, which takes the mercator-projected tiles from OSM and reprojects them on a globe. answered 14 Oct '13, 13:17 Vincent de P... ♦ 17.3k●18●152●249 accept rate: 19%
 0 The splitting is not uneven. The map goes from -85 to +85 latitude on all zoom levels, and from coordinate "0" to coordinate "2**z-1" on all zoom levels. answered 13 Oct '13, 17:13 Frederik Ramm ♦ 81.3k●92●714●1255 accept rate: 23% I am sorry, i didnt get it. At zoom level 0 we have one tile covering the entire earth (-85 to +85 latitude and -180 to +180 longitude) . At zoom level 1 there are 4 tiles (-85 to 0 and 0 to 85 in latitude and -180 to 0 and 0 to 180 in longitude). But at zomm level 2 the split becomes uneven ( -85 to -66, -66 to 0, 0 to 66, 66 to 85 in latitude and -180 to -90, -90 to 0, 0 to 90, 90 to 180 in longitude). So in longitude it still remains perfectly half splitting but in latitude it doesnt. Am i wrong? (13 Oct '13, 17:40) raveesh
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question asked: 13 Oct '13, 15:32

question was seen: 5,341 times

last updated: 14 Oct '13, 13:17