Overview +
+ +We present FORTRAN and MATLAB software for fast and accurate evaluation of +the components of the geomagnetic field represented in high degree (above 720) solid spherical or ellipsoidal harmonics +at many scattered points in the space above the surface of the Earth. + +
The evaluated magnetic field components are: +
The standard algorithm for evaluation of the above magnetic field components is relatively slow due to the high degree of the EMM. +Our algorithm performs several hundred times faster than the standard algorithm and evaluate every quantity with a guaranteed accuracy of less than 1 nT. + +
The codes evaluate the magnetic field at millions of points given by their geodetic geographic coordinates: +latitude, longitude and the height above the Earth reference ellipsoid. +The height ranges from -0.417 km to 1,000 km. + +
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+ Resources
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This is the GitHub +repository of emmsynth_fast source code, including instructions for compiling +and installing it. +The FORTRAN version of the code is contained in the zip archive emmsynth_fast_f.zip (32MB), +while the MATLAB version of the code is contained in the zip archive emmsynth_fast_m.zip (32MB). + +
Every zip file contains the respective source codes, the model coefficients, test files with coordinates of randomly distributed points in space, +the code output for these points and a user manual file readme_emmsynth_fast.pdf. +These user manuals contain a detailed description of the software with instructions for its use and test statistics. + +
The homepage for emmsynth_fast project can be found at +http://imi.cas.sc.edu/sw-geomagnetic-fields/ +from the University of South Carolina website. + +
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