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From what I have read this takes some complicated Math that I am not good at. So, I am asking here.
Does anyone have experience converting a MKMapPoint or CLLocationCoordinate2D to a UTM value? I found this resource (http://www.uwgb.edu/dutchs/usefuldata/UTMFormulas.HTM) but the math is overwhelming.
You could use one lib to do that, or analyze the code of one lib to understand the algorithm and do it yourself.
This is a c++ lib that does the job: http://geographiclib.sourceforge.net/html/
http://geographiclib.sourceforge.net/html/classGeographicLib_1_1UTMUPS.html
I found this website (http://home.hiwaay.net/~taylorc/toolbox/geography/geoutm.html). If you look at the source code, the whole conversion is done using JavaScript, you can have a look at it and try to convert to Obj-c.