Title: Spherical harmonic analysis and synthesis using FFT: Application to temporal gravity variation
Authors: Hwang, C
Kao, YC
土木工程學系
Department of Civil Engineering
Keywords: FFT;geoid;J(2);spherical harmonics;temporal gravity
Issue Date: 1-May-2006
Abstract: FFT and complex algebra-based methods or spherical harmonic analysis and synthesis are presented. Two computer programs in FORTRAN are developed based on the methods. Both general and special cases are discussed. Special cases involve the analyses of gravity changes of the hydrological origin and the atmospheric origin. Functionals of the Earth's gravity field such as gravity anomaly and geoidal height can also be computed via synthesis. Thermal-corrected sea level anomaly from TOPEX/Poseidon and atmospheric pressure from ECMWF are used to compute changes of geopotential coefficients due to oceanic and atmospheric mass redistributions. Interesting phenomena in the changes of geopotential coefficients have been identified. The two computer programs can facilitate analyses and syntheses of gravity products from satellite missions such as GRACE. (c) 2005 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.cageo.2005.07.006
http://hdl.handle.net/11536/12299
ISSN: 0098-3004
DOI: 10.1016/j.cageo.2005.07.006
Journal: COMPUTERS & GEOSCIENCES
Volume: 32
Issue: 4
Begin Page: 442
End Page: 451
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