The main gravity function, geograv::GeoGrav and the definition of the geograv::Coeff class is in include/geograv.hpp

include/EGM96.hpp has the coefficients for the 360x360 egm96 model.

teensy_test is an arduino sketch to run on the teensy.

gravmodelgen.py is a python script to convert text files with coefficients to the c++ header files with coefficients.

main.cpp is a test file for running on desktop.

Installation and Running Tests

First install geographiclib: On mac you can just

brew install geographiclib

Then run

/usr/local/sbin/geographiclib-get-gravity all

to install all of the gravity models.

To run the tests, First open terminal in the geograv directory, then run the following commands:

mkdir build

cd build

cmake ..

make

./TestGeoGrav

To generate new coefficient header files, use gravmodelgen.py, for example:

python gravmodelgen.py -f models/egm96 -n 360 -o include/EGM96.hpp -r 6378137.0 -u 0.3986004418e15

and

python gravmodelgen.py -f models/egm96 -n 20 -o include/EGM96_20.hpp -r 6378137.0 -u 0.3986004418e15