Welcome to the GAMIT and GLOBK home page at the Department of Earth, Atmospheric and Planetary Sciences, MIT.
The current release is 10.71 (9 March 2020).
GAMIT, GLOBK and TRACK form a comprehensive suite of programs for analyzing GNSS measurements primarily to study crustal deformation. The software has been developed by MIT, Scripps Institution of Oceanography and Harvard University with support from the National Science Foundation.
The software may be obtained without written agreement or royalty fee by universities and government agencies for non-commercial education and research purposes. To obtain the download password and be added to the mailing list for future updates, please submit an application for a license here and send an e-mail to Dr. and Dr. . You must include in the e-mail the full name, address, and telephone and fax numbers of your institution. If you are a student, you must also include the name and email of your advisor or other permanent staff member who will receive the announcements and be responsible for the terms of the license.
For any commercial purposes, please visit the MIT Technology Licensing Office web page for GAMIT for information on applying for a commercial license. Please also send an e-mail to Dr. and Dr. , as described above, to be added to the mailing list.
Please cite the latest Introduction to GAMIT/GLOBK for the GAMIT/GLOBK package:
Herring, T. A., R. W. King, M. A. Floyd and S. C. McClusky (2018). Introduction to GAMIT/GLOBK, Release 10.7. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 54 pp. https://geoweb.mit.edu/gg/
GAMIT ("GNSS at MIT") is collection of programs to process phase data to estimate three-dimensional relative positions of ground stations and satellite orbits, atmospheric zenith delays, and Earth orientation parameters. The software is designed to run under any UNIX operating system.
Please cite the latest GAMIT Reference Manual for GAMIT:
Herring, T. A., R. W. King, M. A. Floyd and S. C. McClusky (2018). GAMIT Reference Manual, Release 10.7. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 168 pp. https://geoweb.mit.edu/gg/
GLOBK ("Global Kalman filter") is a Kalman filter whose primary purpose is to combine various geodetic solutions such as GPS, VLBI, and SLR experiments. It accepts as data, or "quasi-observations", the estimates and covariance matricies for station coordinates, Earth orientation parameters, orbital parameters, and source positions generated from the analysis of the primary observations. The input solutions are generally performed with loose a priori uncertainties assigned to all global parameters, so that constraints can be uniformly applied in the combined solution.
Please cite the latest GLOBK Reference Manual for GLOBK:
Herring, T. A., M. A. Floyd, R. W. King and S. C. McClusky (2015). GLOBK Reference Manual, Release 10.6. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 91 pp. https://geoweb.mit.edu/gg/
The most recent "GAMIT/GLOBK In A Day" workshop for beginners and full workshop for intermediate to advanced users, for which the presentations are available under the "Workshops" menu, were hosted by EarthScope in March 2023 and July 2024, respectively.