Publication: Inner and minimum constraint adjustment of marine gravity data
Loading...
Full text at PDC
Publication Date
2004
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Pergamon-Elsevier Science
Citations
Exportar
Abstract
A programme for marine gravity data validation and adjustment is presented-VALDAMA. The aim of the programme is to provide a complete user-friendly system for marine gravity data validation and adjustment that enables the user to define all intervening parameters. The programme is written in standard C and has the possibility of solving for three different types of adjustment: inner constraint, constraint and minimum constraint and allows the user to define the stochastic model. It also has the ability to detect and adjust individual sub-networks, which may occur in regional applications, where track network connectivity fails. VALDAMA uses a parameter file in which the validation parameters, adjustment method and stochastic model are defined. The programme calculates the main statistical parameters and presents the results in spreadsheet format compatible with most common computer office tools. A test case is presented for marine gravity data in the North-East Atlantic Ocean. The complete validation and adjustment of more than 190,000 gravity observations are presented and from an analysis of several adjustment possibilities, it was concluded that inner constraint adjustment may give unpredictable results for global gravity data and that minimum constraint would be the preferred solution.
Description
UCM subjects
Unesco subjects
Keywords
Citation
Adjaout, A., Sarrailh, M., 1997. A new gravity map, a new marine geoid around Japan and the detection of the Kuroshio current. Journal of Geodes 71, 725–735.
Andersen, O.B., Knudsen, P., 1998. Global marine gravity field from ERS-1 and Geosat geodetic mission altimetry. Journal of Geophysical Research 103 (C4), 8129–8137.
Barzaghi, R., Sansó, F., 1983. Sulla stima empirica della funzione di covarianza, Bollettino di Geodesia e Scienze Affini Anno XLII, No. 4, pp. 389–415.
Catalao , J., Sevilla, M.J., 1999. The effect of high precision bathymetric model on geoid computation. International Geoid Service, Bulletin No. 10, pp. 91–99.
Fernandes, M.J., Gidskehaug, A., Solheim, D., Mork, M., Jaccard, P., Catalao, J., 1998. Gravimetric and hydrographic campaign in Azores. In: Proceedings of the I Luso-Spanish Assembly in Geodesyand Geophysics, Almeria, Espanha, 9 a 13 Fevereiro, Universidade de Almería, Departamento de Física Aplicada, p. 113.
Hofmann-Wellenhof, B., 1982. Application of sparse matrix techniques to physical geodesy. Bollettino di Geodesia e Scienze Affini Anno XLI, No. 4, 334–347.
Lemoin, F.G., Smith, D.E., Kunz, L., Smith, R., Pavlis, E.C., Pavlis, N.K., Klosko, S.M., Chinn, D.S., Torrence, M.H., Williamson, R.G., Cox, C.M., Rachlin, K.E., Wang, Y.M.,Kenyon, S.C., Salman, R., Trimmer, R., Rapp, R.H., Nerem, R.S., 1997. The development of the NASA GSFC and NIMA Joint Geopotential Model. In: Segawa, J., Fujimoto, H., Okubo, S. (Eds.)., Proceedings of the International Symposium on Gravity, Geoid and Marine Geodesy, International Association of Geodesy Symposium, vol. 177. Springer, Berlin, pp. 461–469.
Moritz, H., 1980. Advanced Physical Geodesy. H. Wichmann Verlag, Karlsruhe 500pp.
Motao, H., 1995. Marine gravity surveying line system adjustment. Journal of Geodesy70, 158–165. NGDC, 1993. Workshop for marine geophysical data formats. Geophysical Documentation No. 10, National Geophysical Data Center, Boulder, CO, 23pp.
Sevilla, M.J., Catalao, J., 1993. Analysis and validation of BGI gravimetric data in the north-east Atlantic (Ac-ores–Portugal). In: Mare Nostrum, GEOMED Report No. 3, Ed. F. Sansó, Milano, pp. 126–138.
Timmen, L., Bastos, L., Forsberg, R., Gidskehaug, A., Meyer, U., 2002. Airborne gravityfield surveying for oceanography, geology and geodesy—experiences from AGMASCO. International Association of Geodesy Symposia, vol. 121, Springer, Berlin, Heidelberg, 2000, pp. 118–123.
Torge, W., 1989. Gravimetry. Walter de Gruyter, Berlin, 465pp.
Wenzel, H.G., 1992. Sea gravity data adjustment with program SEAGRA. Bureau Gravimetrique International-Bulletin D’Information 71, 59–70.
Wessel, P., Watts, A.B., 1988. On the accuracy of marine Gravity measurements. Journal of Geophysical Research 93 (B1), 393–413.