首页|Geoid interpolation in Gongzhuling City and the 1cm quasi geoid refinement
Geoid interpolation in Gongzhuling City and the 1cm quasi geoid refinement
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The refinement of the 1cm geoid holds significant importance in engineering applications,where the accuracy of the geoid is frequently constrained by its resolution.However,there has been limited exploration into the specific relationship between geoid resolution and accuracy.This article aims to address this gap by thoroughly examining said relationship.This study employs the CapRCR modification to calculate the geoid of Gongzhuling City.The findings indicate that the accuracy can be enhanced by 2%to 9%through encryption of the geoid resolution from 2.5′×2.5′ to 1.5′×1.5′.Furthermore,this improvement can be augmented by 15%to 21%through encryption of the gravity anomaly to the same resolution.The accuracy of the geoid exhibits a linear relationship with the resolution of gravity anomalies.The theoretical accuracy of the geoid,excluding integration errors,is determined to be 1.21 cm.In engineering applications,opting for a resolution of 30''×30''can result in the geoid containing only an integration error of 2 mm.However,to attain an accuracy of 1 cm,it becomes imperative to further mitigate data errors.Consequently,the final refined quasi-geoid accuracy is established at 0.56 mm.
geoidresolutionRCR techniqueinterpolation
WANG Yongchun、ZHONG Linshan、ZHAO Han、WU Qiong
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Tianjin Best Marine Geo-Technology Co.Ltd.,Tianjin 300457,China
School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China
College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China
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