The regional geopotential model to degree and order 720 in China
- 414 Downloads
The spherical harmonic expansion is a powerful method to describe local and global gravity field in the frequency domain. In principle, the resolution and precision of gravity field expressed by the spherical harmonic model are proportional to the degree and order of model expressed, for example, to degree 720 that has a resolution about 28 km. For this reason a higher degree geopotential model is of the advantage for us. It is possible to develop the regional model to degree and order 720 although that seems more difficult for global model in terms of the resolution and precision of gravity data over global area. On the basis of the tailored method, we have developed the regional higher resolution geopotential model IGG97LB to degree and order 720 suitable to the mainland of China. The gravity anomalies computed from the new model can achieve the mean square error of ±8.8 meal. The geoid undulations from model have a mean square error ±0.67 m compared with height anomalies derived from GPS and levelling in the research area. The mean square errors of gravity anomalies and geoid undulations are the same as that computed from reference model EGM96 in global area without China. A clear linear relation between gravity anomalies and geoid undulations on short wavelength parts both computed from the new model has been found in the research area.
KeywordsRegional geopotential model
Unable to display preview. Download preview PDF.
- Basic T. 1989. Untersuchun en zur re ’onalen Geoidbestimmun mit ‘dm’ Genaui keit Dr.-Ing. Dissertation Wissenscha fiche Arbeiten der Vermessungswesen der Universitaete Hannover, Nr.157, Hannover.Google Scholar
- Gleason D.M. 1988. Comparing ellipsoidal corrections to the transformation between the geopotential’s spherical and ellipsoidal spectrums. Manusc.Geod, 3, pp.14–129.Google Scholar
- Hsu H.T. and Y.Lu 1995. The regional geopotential model in China Bolletino di Geodesia e scienze Affini, N.2, pp.61-175.Google Scholar
- Lemoine F.G. D.E.Smith L.Kunz R.Smith E.C.Pavlis N.K.Pavlis S.M.Klosko D.S.Chinn M.H.Torrence R.G.Williamson C.M.Cox K.E.Rachlin Y.M.Wan S.C.KenYon, R.Salman, R.Trimmer R.H.RPP and R.S.Neren 1996. The development of the NASA GSFC and NIMA joint geopotential model International Symposium Gravity, Geoid and Marine Geodesy, International Association o Geodesy Symposia, Tokyo, Japan, September 30–October 5 vol. l 17> Pp. 461–469.Google Scholar
- Lu Yang and F.Z.Jian 1997. High-resolution gravity model and interior tectonic and dynamic feature in northern China Proceedings, IUGG IAG International Symposium on Current Crustal Movement and Hazard Reduction in east Asia and Southeast Asia Wuhan November 18-25 PP.396–404.Google Scholar
- RaPP> R. and J.Cruz 1986. Spherical harmonic expansions of the Earths gravitational potential to degree 360 using 30’ mean anomalies. The Ohio State University, Department o Geodetic Science and Surveying Columbus/Ohio, Report no.376.Google Scholar
- Rapp, R. and J. Cruz, (1986). Spherical harmonic expansions of the Earth’s gravitational potential to degree 360 using 30’ mean anomalies. The Ohio State University, Department of Geodetic Science and Surveying, Columbus/Ohio, Report no.376.Google Scholar
- Rapp, R. and N.K.Pavlis 1990. The development and analysis of geopotential coefficient models to spherical harmonic degree 360. Journal of Geophysical Research 95 bl3 PP.21885–21911.Google Scholar
- Rapp, R. Y.Wang and N.K.Pavlis 1991. The Ohio State 1991 geopotential and sea surface topography harmonic coefficient models. The Ohio State University, Department o Geodetic Science and Surveying, Columbus/Ohio, Report no. 410.Google Scholar
- Wenzel G., (1998). Ultra high degree geopotential model GPM3E97A to degree and order 1800 tailored to Europe, Proceedings of the 2nd Continental Workshop on the Geoid in Europe,Budapest/Hungary, March 10–14, PP.77–80.Google Scholar