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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