Having taken the example page for Map Coordinates as a starting point -
http://code.google.com/apis/maps/documentation/javascript/examples/map-coordinates.html
... 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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