Formula for converting pixels to long lat points

[Todd Birkenholtz]

Formula for converting pixels to long lat points



After I create a static image using the EXTENT   -125.3556 10 -67 49.5 Mapserver creates a image that is 449x349 pixels



I would like to use a ismap to reference the x,y  points on my image and then pass that information to a second web app that will convert the pixel X,Y to  long, Lat  points.



I tried a couple of formulas I found in the list but I can not seam to get it to work.







Thanks for your help.



Todd Birkenholtz



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