New Technology for a New Century
International Conference 
FIG Working Week 2001, Seoul, Korea 611 May 2001

Abstracts

A HYBRID METHOD TO DETERMINE THE HONG KONG GEOID

CHEN Yong-qi and YANG Zhan-ji, Hong Kong, China

Key words: geoid, GPS/leveling, gravity, integration.


Abstract

Integration of all the information/data available must be performed to obtain a precise geoid. A hybrid approach of so-called sequential processing is proposed in this study, which involves two steps. The first step is to construct a gravimetric geoid using the well-developed remove-restore technique. It is then refined with GPS/leveling derived geoid heights and other information. Three methods to refine a gravimetric geoid are discussed: the least squares collocation, a multi-quadratic interpolation function, and the weighted average. The experiment with the Hong Kong geoid indicates the approach is simple and works well.


CONTACT

Prof. CHEN Yong-qi, Chair and YANG Zhan-ji
Department of Land Surveying and Geo-Informatics
The Hong Kong Polytechnic University
Hunghom
Kowloon
HONG KONG SAR, CHINA
Tel. + 852 2755 5966
Fax: + 852 2330 2994
E-mail: lsyqchen@polyu.edu.hk

23 March 2001


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