isGrafLab (Irregular Surface GRAvity Field LABoratory) is a modified version of GrafLab that allows accurate and fast computation of functionals of the geopotential on dense grids at irregular surfaces such as the Earth surface. isGrafLab employs the highly efficient lumped coefficients approach for the evaluations at regular surfaces (the sphere or the ellipsoid of revolution), and the Taylor series expansions to continue these functionals to the irregular surface. All the other options available in GrafLab, such as the employment of three different approaches to compute the fully normalized associated Legendre functions, the graphical user interface or the possibility to depict data on a map, are also available in the new software.

• source code (version 2.0.1)
• input and output data for the test computation
• user manual
• 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, http://dx.doi.org/10.1016/j.cageo.2014.02.005
• list of changes in isGrafLab (updated September 12, 2017)

If you wish to receive notifications of the latest releases of isGrafLab via email, please send an email to Blažej Bucha (the address can be found at the beginning of the source code) with the subject of the email: isGrafLab notifications – signing in. If you no longer wish to receive these emails, please send us an email with the subject: isGrafLab notifications – signing off.