Sweet! I am a geographer / GIS guy too!

I can't help you with your problem, though We don't use stereographic stuff here at the geological surcvey.

Who do you work for? Is it one of those NGA-type places?

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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k