CART2GEOD Convert cartesian coordinates to geodesic coord.

   PT2 = cart2geod(PT1, CURVE)
   PT1 is the point to transform, in Cartesian coordinates (same system
   used for the curve).
   CURVE is a N-by-2 array which represents coordinates of curve vertices.

   The function first compute the projection of PT1 on the curve. Then,
   the first geodesic coordinate is the length of the curve to the
   projected point, and the second geodesic coordinate is the 
   distance between PT1 and it projection.


   TODO : add processing of points not projected on the curve.
   -> use the closest end 

   See also
   polylines2d, geod2cart, curveLength

Package: matgeom