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I have a map projection with a grid overlaid. Is there a way to determine the i,j values for a particular lat/long? The parameters I have been given for this projection are:

Global GEM on full-resolution 30 km Polar Stereographic grid specifications
ni 247
nj 200
resolution at 60° N 30 km
coordinate of first grid point 32.549° N
134.614° W
(i,j) coordinate of North Pole (88.0, 200.0)
grid orientation (with respect to j axis) -111

Would I be able to create an excel sheet that outputs i,j for an input of any lat/long?
So if my input lat/long happens to be in the center of grid point (1,1) the output would be i=1.5 j=1.5
I have attached the projection if anyone would like to take a look.
Thanks for any help!

Attached Thumbnails

  • high_res_glb_small_30km_big.png

Hans van der Maarel

Hans van der Maarel

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Is it me or are questions like this popping up an awful lot lately?
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