GRACE, twin satellites launched in March 2002, are making detailed measurements of Earth's gravity field which will lead to discoveries about gravity and Earth's natural systems. These discoveries could have far-reaching benefits to society and the world's population. The GGM02 model is based on the analysis of 363 days of GRACE in-flight data, spread between April 4, 2002 and Dec 31, 2003. As before, this model is available in two forms: GGM02S - complete to harmonic degree 160 - is derived purely from GRACE satellite data, and is unconstrained by any other information; and GGM02C - complete to degree 200 - is constrained with terrestrial gravity information. Tapley, B., J. Ries, S. Bettadpur, D. Chambers, M. Cheng, F. Condi, B. Gunter, Z. Kang, P.Nagel, R. Pastor, T. Pekker, S.Poole, F. Wang, 'GGM02 - An improved Earth gravity field model from GRACE', Journal of Geodesy (2005), DOI 10.1007/s00190-005-0480-z The original publication is available at www.springerlink.com

GRACE