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Determination of High Precision Quasi-geoid in Boundary of Land and Sea

Sun Ren

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Abstract

In order to get the determination of quasi-geoid at the boundary of land and sea,Quasi-geoid heights derived from these geo-potential models EGM96,WDM94 and GFZ were compared with the help of the 43 GPS/leveling observations and 1 045 observed gravity anomalies respectively.The results showed EGM96 was a preferred geo-potential model for determining the high precision geoid of this area by using remove-restore approach.Since there was no GPS/leveling data on the sea,the approach of distance weighted average was better at interpolating gravimetric geoid with GPS/leveling by comparing with the polynomials.The accuracy of quasi-geoid is higher by 3cm in this area.

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What this paper is about

In order to get the determination of quasi-geoid at the boundary of land and sea,Quasi-geoid heights derived from these geo-potential models EGM96,WDM94 and GFZ were compared with the help of the 43 GPS/leveling observations and 1 045 observed gravity anomalies respectively.The results showed EGM96 was a preferred geo-potential model for determining the high precision geoid of this area by using remove-restore approach.Since there was no GPS/leveling data on the sea,the approach of distance weighted average was better at interpolating gravimetric geoid with GPS/leveling by comparing with the polynomials.The accuracy of quasi-geoid is higher by 3cm in this area.

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Available abstract

In order to get the determination of quasi-geoid at the boundary of land and sea,Quasi-geoid heights derived from these geo-potential models EGM96,WDM94 and GFZ were compared with the help of the 43 GPS/leveling observations and 1 045 observed gravity anomalies respectively.The results showed EGM96 was a preferred geo-potential model for determining the high precision geoid of this area by using remove-restore approach.Since there was no GPS/leveling data on the sea,the approach of distance weighted average was better at interpolating gravimetric geoid with GPS/leveling by comparing with the polynomials.The accuracy of quasi-geoid is higher by 3cm in this area.

Key concepts: Geoid, Undulation of the geoid, Geodesy, Global Positioning System, Geology, Boundary (topology), Remote sensing, Geography

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