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Mercator
projection 
...  \lambda_0
\\ y &=& \ln \left[ \tan \left( \frac {1} {4} \pi + \frac {1} {2} \phi \right) \right]
\\ \ & =& \frac {1} {2} \ln \left( \frac {1 + \sin \phi} {1  \sin ... 

