
 The two points can be anywhere near the SW and NE corners. For
 best accuracy, choose them close to the edges. The data should be
 in a single line format:
 
 nxSW,nySW,longSW,latSW,nxNE,nyNE,longNE,latNE

 Use -ve signs for W/S hemisphere long/lat data. You can use
 Windows 2000 paint program to read (nx,ny) pixel coordinates.
 (note: pixel (0,0) starts at topleft). long/lat data should be
 in degrees and can be found upto 6 decimal places using
 Google Earth or Whirlwind programs. 

 