One technique for refining the global Earth gravity models

详细信息    查看全文

• 作者：V. N. Koneshov ; V. B. Nepoklonov ; O. V. Polovnev
• 关键词：gravity anomaly ; geoid height ; gravitational field of the Earth ; global model ; topography ; topographic correction
• 刊名：Izvestiya, Physics of the Solid Earth
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：53
• 期：1
• 页码：108-115
• 全文大小：
• 刊物主题：Geophysics/Geodesy;
• 出版者：Pleiades Publishing
• ISSN：1555-6506
• 卷排序：53

文摘

The results of the theoretical and experimental research on the technique for refining the global Earth geopotential models such as EGM2008 in the continental regions are presented. The discussed technique is based on the high-resolution satellite data for the Earth’s surface topography which enables the allowance for the fine structure of the Earth’s gravitational field without the additional gravimetry data. The experimental studies are conducted by the example of the new GGMplus global gravity model of the Earth with a resolution about 0.5 km, which is obtained by expanding the EGM2008 model to degree 2190 with the corrections for the topograohy calculated from the SRTM data. The GGMplus and EGM2008 models are compared with the regional geoid models in 21 regions of North America, Australia, Africa, and Europe. The obtained estimates largely support the possibility of refining the global geopotential models such as EGM2008 by the procedure implemented in GGMplus, particularly in the regions with relatively high elevation difference.