Geodesics on an ellipsoid of revolution by Charles Karney

Solutions of the direct and inverse geodesic problems (area, distance, earth)

defaultellipsoid

ecc2flat(e)

flat2ecc(f)

Geodesic projections for an ellipsoid by Charles Karney

Four map projections based on geodesics (map projections, geodesics, azimuthal equidistant)

cassini_fwd(lat0, lon0, lat, lon, ellipsoid)

cassini_inv(lat0, lon0, x, y, ellipsoid)

eqdazim_fwd(lat0, lon0, lat, lon, ellipsoid)