Simple Mapping functions.
Calculates the great circle azimuth from a point 1 to a point 2.
Calculates the distance (in degrees) between PT1 and PT2.
Compute the coordinates of the end-point of a displacement on a sphere.
Converts angles input in radians to the equivalent in degrees.
Converts angles input in degrees to the equivalent in radians.
Convert a distance along a great circle of the Earth from km to degrees.