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APPENDIX A: North-East coordinates to Up-Left coordinates for Gnomonic Projection
l = z × m

e = p × m

∥l × e∥
l ⋅ e
tan  =
(2)
m
 ⋅  l × e   0 ⇒  = 2  − 
[
Then, the transformation is obtained by multiplying the north-east coordinates by the rotation matrix
cos   −sin 
.
sin 
cos 
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ICSOFT Programmer Manual Rev 3.6.4, February 2015
]