[OpenMap Users] map exactly

Hi,
  I have a image and i added as a layer in Openmap. The layer i created
represents 1500 kms in width and 1500kms in height. I place this at certain
latitude and longitude. My Question is How to map it exactly?? I mean the
distance covered by layer on the map should be 1500 kms, How could this be
possible.
 The program output looks something like this,
 http://people.aero.und.edu/~kmyadam/naples.jpg
  kedar.

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