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The best reference for this is this page on the OSM Wiki. It has Pseudo code as well as code in various languages for converting from the XYZ tilenames, to the bounding box. The Pseudocode for this is as follows n = 2 ^ zoom lon_deg = xtile / n * 360.0 - 180.0 lat_rad = arctan(sinh(π * (1 - 2 * ytile / n))) lat_deg = lat_rad * 180.0 / π Note that this ...
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