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Study on the selection of optimal global geopotential models for geoid determination in Kuwait
Survey Review ( IF 1.6 ) Pub Date : 2019-05-14 , DOI: 10.1080/00396265.2019.1611256
Mohamed El-Ashquer 1 , Hamad Al-Ajami 2, 3 , Ahmed Zaki 4 , Mostafa Rabah 2
Affiliation  

In this study, a thorough validation of the recently released Global Geopotential Models (GGMs) has been carried out by comparing all models with both the free-air (FA) gravity anomaly observations and GPS/Levelling data in Kuwait. First, the gravity functional in terms of FA gravity anomalies and geoid heights that derived from GGMs and compared with the ground-based data before applying the Spectral Enhancement Method (SEM). The findings indicate that the combined GGMs, generally, fit the ground data better than the satellite-only GGMs due to the existing spectral gaps. Second, the FA gravity anomalies and geoid heights, obtained from GGMs at maximum Spherical Harmonics (SH) degree/order (d/o) for the combined models and from spherical harmonics d/o ranging from 100 to their maximum d/o, with a step of 10 d/o for the satellite only GGMs, were compared with the corresponding ones from terrestrial data using the SEM. For the FA gravity signal, the EIGEN-6C4 manifested the best results of combined GGMs with differences characterised with a mean of 0.967 mGal and a Standard Deviation (STD) of 2.845 mGal, while TIM_R5 at SH (d/o) 200 showed the best results with a mean of satellite only GGMs with a mean if 1.008 mGal and a STD of 2.657 mGal. In the case of the evaluation of the geoidal height with GPS/levelling, XGM2016 manifested the best results of combined GGMs with differences characterised with a STD of 0.234 m. For the satellite only GGMs, the best results have been obtained from SPW_R5 at SH d/o 250 with a STD 0.207 m.



中文翻译:

科威特确定大地水准面的最佳全局地势模型的选择研究

在这项研究中,通过将所有模型与自由空气(FA)重力异常观测值和科威特的GPS /水准仪数据进行比较,对最近发布的全球地理潜力模型(GGM)进行了全面验证。首先,在应用光谱增强方法(SEM)之前,根据GGM导出的FA重力异常和大地水准面高度的重力函数与地面数据进行比较。研究结果表明,由于现有频谱差距,组合的GGM通常比仅使用卫星的GGM更适合地面数据。其次,FA重力异常和大地水准面高度,是从组合模型的最大球谐(SH)度/阶数(d / o)的GGM和从100到最大d / o的球谐d / o获得的,对于仅卫星GGM,步长为10 d / o,使用SEM将其与相应的地面数据进行比较。对于FA重力信号,EIGEN-6C4表现出组合GGM的最佳结果,其差异特征在于平均值为0.967 mGal,标准偏差(STD)为2.845 mGal,而SH(d / o)200处的TIM_R5表现最佳只有卫星GGM的平均值为1.008 mGal,STD为2.657 mGal。在用GPS /水准仪评估大地水准面高度的情况下,XGM2016表现出组合GGM的最佳结果,其特征在于STD为0.234 m。对于只有卫星的GGM,从SPW_R5在SH d / o 250处获得最佳结果,其STD为0.207 m。EIGEN-6C4表现出组合GGM的最佳结果,其差异的特征是平均值为0.967 mGal,标准偏差(STD)为2.845 mGal,而SH(d / o)200处的TIM_R5的最佳结果是卫星平均值只有GGM的平均值为1.008 mGal,STD为2.657 mGal。在用GPS /水准仪评估大地水准面高度的情况下,XGM2016表现出组合GGM的最佳结果,其特征在于STD为0.234 m。对于只有卫星的GGM,从SPW_R5在SH d / o 250处获得最佳结果,其STD为0.207 m。EIGEN-6C4表现出组合GGM的最佳结果,其差异的特征是平均值为0.967 mGal,标准偏差(STD)为2.845 mGal,而SH(d / o)200处的TIM_R5则以卫星平均值显示出最佳结果只有GGM的平均值为1.008 mGal,STD为2.657 mGal。在用GPS /水准仪评估大地水准面高度的情况下,XGM2016表现出组合GGM的最佳结果,其特征在于STD为0.234 m。对于只有卫星的GGM,从SPW_R5在SH d / o 250处获得最佳结果,其STD为0.207 m。在使用GPS /水准仪评估大地水准面高度的情况下,XGM2016表现出组合GGM的最佳结果,其特征在于STD为0.234 m。对于只有卫星的GGM,从SPW_R5在SH d / o 250处获得最佳结果,其STD为0.207 m。在用GPS /水准仪评估大地水准面高度的情况下,XGM2016表现出组合GGM的最佳结果,其特征在于STD为0.234 m。对于只有卫星的GGM,从SPW_R5在SH d / o 250处获得最佳结果,其STD为0.207 m。

更新日期:2019-05-14
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