Height connection across sea by using satellite altimetry data sets, ellipsoidal heights, astrogeodetic deflections of the vertical, and an Earth Gravity Model

IF 2.8 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geodesy and Geodynamics Pub Date : 2023-07-01 DOI:10.1016/j.geog.2022.11.010
Jianbo Wang , Xinmin Qi , Kai Luo , Zhengyuan Li , Ruikang Zhou , Jinyun Guo
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引用次数: 3

Abstract

Islands and the mainland are separated by seas, and the distances between them might be so long that the height on the mainland cannot be exactly translated to the islands, resulting in different height systems on the mainland and the islands. In this study, we used astrogeodetic deflections of the vertical and ellipsoidal heights of points on the mainland and island near their coastlines to implement height connection across sea areas. First, the modeled gravity and modeled astrogeodetic vertical deflections of segmentation points along connecting routes over the sea between the mainland and the island were determined by Earth Gravity Model (EGM), and the ellipsoidal heights of segmentation points were determined by the satellite altimetry data sets. Second, we used a linear interpolation model to increase the precision of the vertical deflections of segmentation points. Third, we computed the geopotential difference of points between the mainland and the island using a method derived from geopotential theory and the astronomical leveling principle. Finally, we estimated the normal height of the point on the island using the geopotential-difference iterative computation approach. Using observed data of normal heights, ellipsoidal heights, and astrogeodetic vertical deflections referring to height sites in Qingdao, Shandong Province, we conducted a numerical experiment involving the normal height connection across sea regions. We determined the data of the ellipsoidal heights and gravity of segmentation points along the connecting route across the water in the numerical experiment using DTU10. The distance of the height connection across the sea was approximately 10.5 km. According to China's official leveling specifications, the experimental results met the criterion of third-class leveling precision.

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利用卫星测高数据集、椭球面高度、垂直方向的天文测量偏差和地球重力模型进行跨海高度连接
岛屿和大陆被海洋隔开,它们之间的距离可能很长,大陆上的高度不能准确地转换到岛屿上,导致大陆和岛屿的高度系统不同。在本研究中,我们利用大陆和岛屿上靠近海岸线的点的垂直高度和椭球面高度的天文大地测量挠度来实现跨海域的高度连接。首先,利用地球重力模型(Earth gravity Model, EGM)确定大陆与岛屿之间海上连接路线上切分点的模型重力和模型天文大地测量垂直挠度,并利用卫星测高数据集确定切分点的椭球高度。其次,我们使用线性插值模型来提高分割点垂直偏移的精度。第三,利用位势理论和天文水准原理推导出大陆与岛屿之间点的位势差。最后,利用位势差分迭代计算方法估计了岛上点的法向高度。利用山东省青岛市高程站点的法向高度、椭球高度和天文大地垂直位移观测资料,进行了跨海域法向高度联系的数值试验。在数值实验中,我们利用DTU10确定了跨水连接路线上分割点的椭球高度和重力数据。跨越海洋的高度连接距离约为10.5公里。根据中国官方水准规范,实验结果达到三级水准精度标准。
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来源期刊
Geodesy and Geodynamics
Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
4.40
自引率
4.20%
发文量
566
审稿时长
69 days
期刊介绍: Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.
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