Website Map - X/Y coordinate to Lat / Long algorithm required.

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Description

Experience Level: Intermediate
We need to overlay cities from a database onto a flash map, within a webpage, which uses its own X/Y coordinate system (with position 0,0 at an extremity).

We need to convert this to Lat / Long in order to be able to overlay the city locations.

Whilst it's flash and web technologies in a PHP / Ajax page, it's possible that just the logic or algorithm would be sufficient, so you may not necessarily need these skills.

As far as we can tell, the coordinates are uniform and consistent, but I can't guarantee this as we have no control over the map API.

The rest of the task (i.e. database / overlay etc) isn't a problem for us, just the X/Y to Lat/Long conversion.. a maths guru or logic bod required please!

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