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Assessment of Gravity Field and Steady State Ocean Circulation Explorer (GOCE) geoid model using GPS levelling over Sabah and Sarawak

Othman, A. H. and Omar, K. M. and Din, A. H. M. and Som, Z. A. M. and Yahaya, N. A. Z. and Pa'Suya, M. F. (2016) Assessment of Gravity Field and Steady State Ocean Circulation Explorer (GOCE) geoid model using GPS levelling over Sabah and Sarawak. In: 8th IGRSM International Conference and Exhibition on Geospatial and Remote Sensing, IGRSM 2016, 13 April 2016 through 14 April 2016, Kuala Lumpur; Malaysia.

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Abstract

The GOCE satellite mission has significantly contributed to various applications such as solid earth physics, oceanography and geodesy. Some substantial applications of geodesy are to improve the gravity field knowledge and the precise geoid modelling towards realising global height unification. This paper aims to evaluate GOCE geoid model based on the recent GOCE Global Geopotential Model (GGM), as well as EGM2008, using GPS levelling data over East Malaysia, i.e. Sabah and Sarawak. The satellite GGMs selected in this study are the GOCE GGM models which include GOCE04S, TIM-R5 and SPW-R4, and the EGM2008 model. To assess these models, the geoid heights from these GGMs are compared to the local geometric geoid height. The GGM geoid heights was derived using EGMLAB1 software and the geometric geoid height was computed by available GPS levelling information obtained from the Department Survey and Mapping Malaysia. Generally, the GOCE models performed better than EGM2008 over East Malaysia and the best fit GOCE model for this region is the TIM-R5 model. The TIM-R5 GOCE model demonstrated the lowest R.M.S. of ± 16.5 cm over Sarawak, comparatively. For further improvement, this model should be combined with the local gravity data for optimum geoid modelling over East Malaysia.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:Geodesy, Global positioning system, Oceanography, Remote sensing
Subjects:G Geography. Anthropology. Recreation > G Geography (General) > G109.5 Global Positioning System
Divisions:Geoinformation and Real Estate
ID Code:73175
Deposited By: Muhammad Atiff Mahussain
Deposited On:22 Nov 2017 20:07
Last Modified:22 Nov 2017 20:07

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