The sample you mentioned has both from/to formula. On Mar 3, 9:10 am, sgiddings <mr.s.giddi...@gmail.com> wrote: > Having taken the example page for Map Coordinates as a starting point > -http://code.google.com/apis/maps/documentation/javascript/examples/ma... > > ... I tried to do a the conversion shown here in reverse. > Obviously, I have some problems. > > Here is my pseudo code - > 1. Convert pixels to world coordinates > x = pixel x / pow(2, zoom level) > y = pixel y / pow(2, zoom level) > > 2. Convert world coordinates to lat/lng > Lng = (x – pixel origin x) / Pixels per Longitude in degrees > Lat = rad2deg(2 * atan(exp(latRadians)) – pi / 2) > where latRadians = > (y – pixel orgin y) / Pixels per Longitude in radians > > Using the output values from the example page : > Pixel X : 67247 > Pixel Y : 97459 > Zoom Level : 10 > > I get the following results > Latitude : 97459 > Longitude : 67247 > > These are conversions I need to do on the server. > Can anyone help me correcting the formulas ? > > Simon
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