isGrafLab (Irregular Surface GRAvity Field LABoratory) is a modified version of GrafLab to perform accurate and fast computation of functionals of the geopotential at dense grids residing on irregular surfaces such as the Earth's surface. It employs the lumped coefficients approach for surface spherical harmonic synthesis of gravity field quantities and their vertical derivatives at regular surfaces (sphere or ellipsoid of revolution), and then it continues the quantities to the irregular surface using the Talor series.
If you want just a brief introduction to isGrafLab, see docs/user-manual.md.
Detailed isGrafLab cookbook is available at https://github.com/blazej-bucha/graflab-cookbook.
The equations implemented in isGrafLab can be found in the documentation of
GrafLab (see the docs folder
therein).
Contributions of any kind are welcome!
Feel free to contact the author, Blazej Bucha, at blazej.bucha@stuba.sk.
If you use isGrafLab in your work, please consider citing our paper on isGrafLab.
- Bucha, B., Janák, J., 2014. A MATLAB-based graphical user interface program for computing functionals of the geopotential up to ultra-high degrees and orders: Efficient computation at irregular surfaces. Computers & Geosciences 66, 219-227, https://doi.org/10.1016/j.cageo.2014.02.005
-
CHarm: C library for spherical harmonic transforms up to high degrees (tens of thousands and beyond). Supports OpenMP parallelization for shared memory architectures and vectorized CPU instructions (AVX, AVX2, AVX-512).
-
GrafLab (GRAvity Field LABoratory): GrafLab (GRAvity Field LABoratory) is a MATLAB-based routine to compute functionals of the geopotential up to high degrees (tens of thousands and beyond).
isGrafLab is an old project that breaks almost all of the best practices in terms of coding and documenting standards. Nonetheless, the package seems to work correctly, it has been thoroughly tested and the computation speed is reasonable (as far as it is possible in MATLAB). Hoping it might still be useful to others, isGrafLab remains being publicly available.