GeographicLib is a small set of C++ classes for converting between geographic, UTM, UPS, MGRS, and geocentric coordinates, for gravity (e.g., EGM2008), geoid, and geomagnetic field (e.g., WMM2010) calculations, and for solving geodesic problems. For documentation, visit

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MIT License

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User Reviews

  • Very fast and very accurate. Don't reinvent the wheel! Use this!

  • It has some useful for me, thanks!

  • Hi Visit the blog "Zona OpenGTS" (www) Thanks !!!

  • GeographicLib is a great library. I use it in FFGo to solve the geodetic inverse and direct problems, as well as to get magnetic declination data, and it works great! Having a ready-to-use algorithm that is more robust than the Vincenty algorithm for the geodetic inverse problem (and also more accurate, as I understood it) it invaluable. Thank you so much, Mr. Karney! (for info, I use the Python 3 implementation for geodetic calculations and call MagneticField as an external program to get magnetic declination data)

  • Powerful, super easy thanks to a great documentation. Thank you!

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Additional Project Details

Intended Audience

Science/Research, Advanced End Users, Developers

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Programming Language

Fortran, MATLAB, Python, C++, C, JavaScript