测绘通报 ›› 2025, Vol. 0 ›› Issue (7): 142-146.doi: 10.13474/j.cnki.11-2246.2025.0723

• 技术交流 • 上一篇    下一篇

加密重力测量对省级似大地水准面模型的影响分析

吴志文1, 耿晓燕2, 唐国礼1, 王亦欣1, 周卫1, 张思军1   

  1. 1. 湖南省第一测绘院, 湖南 长沙 410000;
    2. 自然资源部大地测量数据处理中心, 陕西 西安 710054
  • 收稿日期:2024-12-31 发布日期:2025-08-02
  • 通讯作者: 耿晓燕。E-mail:327078090@qq.com
  • 作者简介:吴志文(1974—),男,高级工程师,主要从事大地测量、工程测绘和测绘地理信息技术应用研究。E-mail:wwzzww2005@126.com
  • 基金资助:
    湖南省第一测绘院科研项目(KY202404;KY202405;KY202406)

Analysis of the influence of densified gravity survey on the provincial quasi-geoid model

WU Zhiwen1, GENG Xiaoyan2, TANG Guoli1, WANG Yixin1, ZHOU Wei1, ZHANG Sijun1   

  1. 1. The First Surveying and mapping Institute of Hunan Province, Changsha 410000, China;
    2. Geodetic Data Processing of Surveying and Mapping, Xi'an 710054, China
  • Received:2024-12-31 Published:2025-08-02

摘要: 重力数据是确定似大地水准面模型的基础数据,直接影响似大地水准面模型的高频成分。本文通过高程异常的变化量分析了重力数据对似大地水准面模型的影响。首先,利用参考重力场模型、重力数据、地形数据等,基于Molodensky原理确定试验区似大地水准面模型;然后,增加重力资料稀疏地区的重力数据,基于相同的策略计算似大地水准面模型;最后,分析重力数据变更区域似大地水准面模型的差异。结果表明,新增重力数据后,新的似大地水准面模型变化幅度为-3.7~4.0 cm,变化量绝对值大于1 cm的区域占整个精化区域的7.8%。此外,高程异常变化显著的地区主要位于复杂山区,进一步突显重力数据在地形复杂的重要性。

关键词: 湖南似大地水准面, 加密重力, Faye异常, 高程异常

Abstract: Gravity data is basic data to determine the quasi-geoid model,which directly affects the medium and short wave components of the quasi-geoid.In this paper,the influence of gravity data on the quasi-geoid is analyzed by the variation of height anomaly.Firstly,the reference gravity field model,gravity data and topographic data are used to determine the quasi-geoid model based on Molodensky principle.Secondly,the quasi-geoid is calculated based on the same strategy by adding the gravity data in the sparse area.Finally,the difference of the quasi-geoid model in the changing area of gravity data is analyzed.The result shows that the variation range of the new quasi-geoid model is -3.7~4.0 cm after the addition of gravity data,and the proportion of the region with the absolute value of change greater than 1 cm is 7.8%of the whole region.In addition,the area with significant height anomaly changes are mainly located in complex mountainous area,which further highlights the importance gravity data in area with complex topographical features.

Key words: Hunan quasi-geoid, densified gravity data, Faye anomaly, height anomaly

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