Monday

April 21, 2014

April 21, 2014

Posted by **forest** on Sunday, October 16, 2011 at 11:32am.

x = R cos (phi) sin (lamda)

y = R sin (phi)

they are used in orthogonal projection of a spherical surface to a flat surface in the (x y) plane.

where (phi)=latitude

(lamda)=longitude

- Maths trigonometry -
**Steve**, Monday, October 17, 2011 at 10:53amwikipedia has a nice article explaining this projection. Your example uses an origin of (0,0) for the projection, reducing the complexity of the equations considerably.

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