C library for Geodesics
2.1
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This is a C implementation of the geodesic algorithms from GeographicLib. This is a self-contained library (requiring only the standard C math library) which makes it easy to do geodesic computations for an ellipsoid of revolution in a C program. It is incorporated into PROJ and many people might prefer to use these routines via PROJ.
This an implementation in C of the geodesic algorithms described in
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