This is a library to solve geodesic problems on an ellipsoid model of the earth.
The two tools ngsforward and ngsinverse are replacements for the tools FORWARD and INVERSE available from the NGS
Licensed under the MIT/X11 License; see LICENSE.txt.
The algorithms are documented in
- C. F. F. Karney, Algorithms for geodesics, J. Geodesy 87(1), 43–55 (2013); Addenda.
- Library documentation: https://geographiclib.sourceforge.io/Fortran/doc
- Change log: https://geographiclib.sourceforge.io/Fortran/doc/changes.html
- Git repository: https://github.com/geographiclib/geographiclib-fortran
Releases are tagged in git as, e.g.,
v1.52,v2.0, etc. - Source distribution: https://sourceforge.net/projects/geographiclib/files/distrib-Fortran
- This Fortran library has been incorporated with (some language modernization) into Jacob Williams' geodesic-fortran library.
- GeographicLib: https://geographiclib.sourceforge.io
- Author: Charles Karney, karney@alum.mit.edu