Practical Methods for the Downward Continuation of Airborne Gravity Data in the Sea Area
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摘要: 针对航空重力测量向下延拓过程固有的不确定性根据海域重力场的变化特点和现有技术条件分别提出了利用卫星测高重力向上延拓和超高阶位模型EGM2008直接计算延拓改正数从而实现航空重力测量向下延拓归算的两种实用方法联合使用卫星测高海面船测和航空重力测量数据进行了实际数值计算和精度评估验证了新方法的有效性.
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关键词:
- 航空重力测量 /
- 向下延拓 /
- 不稳定性 /
- 卫星测高 /
- EGM2008位模型
Abstract: Two practical downward continuation methods are proposed for the sea surveying areas inaccordance with their gravit y characteristics and available information addressing the uncertainty of downward continuation for airborne gravit y data.In the first methodthe continuation corrections are calculated by using the upward continuation of satellite gravit y data and in the other by using EGM2008gravit y field model.A satellite gravit y data settwo sea-borne gravit y data setsand an airborne gravit y data set are used as a case stud y to test the efficienc y of these new methods.-
Keywords:
- airborne gravimetr y /
- downward continuation /
- unstability /
- satellite altimetr y /
- EGM2008
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