lssndrbarbieri@gmail.com Alessandro Barbieri charles@karney.com Charles Karney https://geographiclib.sourceforge.io/html https://sourceforge.net/p/geographiclib/bugs/ geographiclib Boost library is searched for in order to build the NearestNeighbor example Install the gravity models Install the geoid datasets Install the magnetic field models http://earth-info.nga.mil/GandG/wgs84/gravitymod/wgs84_180/wgs84_180.html 30' grid http://earth-info.nga.mil/GandG/wgs84/gravitymod/wgs84_180/wgs84_180.html 15' grid http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm96/egm96.html 15' grid http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm96/egm96.html 5' grid http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008 5' grid http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008 2.5' grid http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008 1' grid the Earth Gravity Model 1984, which includes terms up to degree 180 the Earth Gravity Model 1996, which includes terms up to degree 360 the Earth Gravity Model 2008, which includes terms up to degree 2190 the WGS84 Reference Ellipsoid. This is just reproduces the normal gravitational field for the reference ellipsoid. This includes the zonal coefficients up to order 20. the World Magnetic Model 2010, which approximates the main magnetic field for the period 2010–2015. the World Magnetic Model 2020, which approximates the main magnetic field for the period 2020–2025. the World Magnetic Model 2015, which approximates the main magnetic field for the period 2015–2020. the International Geomagnetic Reference Field (11th generation), which approximates the main magnetic field for the period 1900–2015. the International Geomagnetic Reference Field (12th generation), which approximates the main magnetic field for the period 1900–2020. the Enhanced Magnetic Model 2010, which approximates the main and crustal magnetic fields for the period 2010–2015. the Enhanced Magnetic Model 2015, which approximates the main and crustal magnetic fields for the period 2000–2020. the Enhanced Magnetic Model 2017, which approximates the main and crustal magnetic fields for the period 2000–2022. floating point arbitrary precision floating point 53-bit precision floating point 113-bit precision floating point 64-bit precision floating point 24-bit precision 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.