I don't know the form and size of the snippet, I'm assuming it's rectangular because I don't see a reason for it not to be.. I think We're still having an issu

I don't know the form and size of the snippet, I'm assuming it's rectangular because I don't see a reason for it not to be.. I think We're still having an issue at the poles: If you take a rectangular snippet out of the image you've uploaded which its topmost edge coincides with the topmost part of the image, what can we expect the transformation to yield? They might be dealing with edge cases behind the scenes in some way. Mathematically speaking there can't be a way to fully invert a transformation from 3D to 2D, so I guess they settled for something that they can still work around. In any case even though I'd like to know the exact details, at this point my curiosity seems to be satiated. Thanks for the friendly conversation. :)