GeographicLib

GeographicLib is a small set of C++ classes for performing conversions between geographic, UTM, UPS, MGRS, geocentric, and local cartesian coordinates, for gravity (e.g., EGM2008), geoid height, and geomagnetic field (e.g., WMM2020) calculations, and for solving geodesic problems. It is a suitable replacement for the core functionality provided by geotrans. The library is licensed under the MIT License; see LICENSE.txt for the terms.

• New home page
• Main project page
• Library documentation
• git repository
• Download
• Implementations in other languages:
  • C (geodesic routines): documentation, also included with recent versions of PROJ and the R package, geosphere;
  • Fortran (geodesic routines): documentation;
  • Java (geodesic routines): Maven Central package, documentation;
  • JavaScript (geodesic routines): npm package, documentation;
  • Python (geodesic routines): PyPI package, documentation;
  • Matlab/Octave (geodesic and some other routines): Matlab Central package, documentation;
  • Mathematica (not part of GeographicLib): mathematica-geodesic by Kei Misawa;
  • R (not part of GeographicLib): geosphere by Robert J. Hijmans, documentation;
  • Rust (not part of GeographicLib): geographiclib-rs by Michael Kirk;
  • Cython (interface to GeographicLib): geographiclib-cython-bindings by Sergey Serebryakov;
  • JavaScript (interface to GeographicLib): opensphere-asm by William Wall.
• Test data for
  • the geodesic problem
  • the transverse Mercator projection
  • geoid heights
• Gridded geoid data; see here for documentation
• Earth gravity models; see here for documentation
• Geomagnetic models; see here for documentation
• Online calculations using GeographicLib utilities
  • geographic coordinate conversions between latitude/longitude, UTM or UPS, and MGRS
  • direct and inverse geodesic calculations
  • calculate the perimeter and area of geodesic polygons
  • various geodesic calculations using JavaScript
  • a tool for displaying geodesics on Google Maps
  • a graphical tool for geodesic calculations
  • rhumb line calculator
  • evaluate the geoid height for EGM84, EGM96, and EGM2008
• A geodesic bibliography. This lists many papers treating geodesics on an ellipsoid and includes links to online versions of the papers.
• Resource page for
  • C. F. F. Karney, Transverse Mercator with an accuracy of a few nanometers, J. Geodesy 85(8), 475–485 (Aug. 2011); preprint arXiv:1002.1417; addenda.
• Resource page for
  • C. F. F. Karney, Geodesics on an ellipsoid of revolution, arXiv:1102.1215 (Feb. 2011).
  • C. F. F. Karney, Algorithms for geodesics, J. Geodesy 87(1), 43–55 (Jan. 2013); DOI: 10.1007/s00190-012-0578-z; addenda.