Improvement of Downward Continuation Values of Airborne Gravity Data in Taiwan
Improvement of Downward Continuation Values of Airborne Gravity Data in Taiwan
复制标题
台湾机载重力数据向下延续值的改进
DOI：
10.3390/rs10121951
复制
发表时间：
2018
期刊：
影响因子：
5
通讯作者：
Strykowski Gabriel
中科院分区：
文献类型：
--
作者：
Zhao Qilong;Xu Xinyu;Forsberg Rene;Strykowski Gabriel
为了填补台湾山区重力资料的空白，进行了航空重力测量。然而，航空重力数据的向下延拓误差是一个主要问题，特别是在地形复杂的地区，如台湾。向下延延值与陆地重力差的均方根（RMS）约为20 mGal。为了改进向下延延的结果，本文研究了逆泊松积分、正则化结合的半参数方法和最小二乘配置方法。结果表明，SPR作为泊松逆积分的一个有价值的补充，是估计系统误差和抑制随机误差的有效方法。因此，将地形校正后的LSC方法应用于台湾地区实际航空重力资料的向下延拓。统计结果表明，下延延值与地面重力数据差值的均方根值减小到11.7 mGal，提高了40%。
An airborne gravity survey was carried out to fill gaps in the gravity data for the mountainous areas of Taiwan. However, the downward continuation error of airborne gravity data is a major issue, especially in regions with complex terrain, such as Taiwan. The root mean square (RMS) of the difference between the downward continuation values and land gravity was approximately 20 mGal. To improve the results of downward continuation we investigated the inverse Poisson’s integral, the semi-parametric method combined with regularization (SPR) and the least-squares collocation (LSC) in this paper. The numerically simulated experiments are conducted in the Tibetan Plateau, which is also a mountainous area. The results show that as a valuable supplement to the inverse Poisson’s integral, the SPR is a useful approach to estimate systematic errors and to suppress random errors. While the LSC approach generates the best results in the Tibetan Plateau in terms of the RMS of the downward continuation errors. Thus, the LSC approach with a terrain correction (TC) is applied to the downward continuation of real airborne gravity data in Taiwan. The statistical results show that the RMS of the differences between the downward continuation values and land gravity data reduced to 11.7 mGal, which shows that an improvement of 40% is obtained.