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首页> 外文期刊>International Journal of Geosciences >On the Accuracy Assessment of the Latest Releases of GOCE Satellite-Based Geopotential Models with EGM2008 and Terrestrial GPS/Levelling and Gravity Data over Egypt
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On the Accuracy Assessment of the Latest Releases of GOCE Satellite-Based Geopotential Models with EGM2008 and Terrestrial GPS/Levelling and Gravity Data over Egypt

机译：利用EGM2008和埃及地面GPS /水准和重力数据对最新发布的GOCE卫星地势模型进行精度评估

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The Global Geopotential Models (GGMs) of GOCE (Gravity Recovery and steady- state Ocean Circulation Explorer) differ globally as well as regionally in their accuracy and resolution based on the maximum degree and order (d/o) of the fully normalized spherical harmonic (SH) coefficients, which express each GGM. The main idea of this study is to compare the free-air gravity anomalies and quasi geoid heights determined from several recent GOCE-based GGMs with the corresponding ones from the Earth Gravitational Model 2008 (EGM2008) over Egypt on the one hand and with ground-based measurements on the other hand. The results regarding to the comparison of GOCE-based GGMs with terrestrial gravity and GPS/levelling data provide better improvement with respect to EGM2008. The 4th release GOCE-based GGM developed with the use of space-wise solution strategy (SPW_R4) approximates the gravity field well over the Egyptian region. The SPW_R4 model is accordingly suggested as a reference model for recovering the long wavelength (up to SH d/o 200) components of quasi geoid heights when modelling the gravimetric quasi-geoid over the Egypt. Finally, three types of transformation models: Four-, Five- and Seven-parameter transformations have been applied to reduce the data biases and to provide a better fitting of quasi geoid heights obtained from the studied GOCE-based GGMs to those from GPS/levelling data. These models reveal that the standard deviation of vertical datum over Egypt is at the level of about 32 cm.
机译：基于完全归一化的球谐函数的最大程度和阶数（d / o），GOCE（重力恢复和稳态海洋环流探测器）的全球地势模型（GGM）在全球和区域上的准确性和分辨率有所不同。 SH）系数，表示每个GGM。这项研究的主要思想是，一方面比较埃及最近几个基于GOCE的GGM确定的自由空气重力异常和准大地水准面高度，然后与埃及上方的地球引力模型2008（EGM2008）对应的重力异常和准大地水准面进行比较。另一方面，基于测量。有关将基于GOCE的GGM与地面重力和GPS /水准仪数据进行比较的结果，相对于EGM2008，可以提供更好的改进。使用太空解决方案策略（SPW_R4）开发的基于GOCE的第四版GGM可以很好地近似埃及地区的重力场。因此，建议使用SPW_R4模型作为参考模型，以便在对埃及的重力准类地线建模时恢复准大地水准面高度的长波长（最高SH d / o 200）分量。最后，已应用三种类型的转换模型：四参数，五参数和七参数转换，以减少数据偏差并更好地将基于研究的基于GOCE的GGM获得的准大地水准面高度与来自GPS /水准测量的准大地水准面拟合数据。这些模型表明，埃及上空基准面的标准偏差在32 cm左右。

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