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首页> 外文会议>Proceedings of 4th international GOCE User workshop. >UPDATING EGM08 MEDITERRANEAN GEOID USING LOCAL GOCE DATA FROM THE SPACE-WISE SOLUTION
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UPDATING EGM08 MEDITERRANEAN GEOID USING LOCAL GOCE DATA FROM THE SPACE-WISE SOLUTION

机译：使用空间明智解决方案中的本地GOCE数据更新EGM08地中海大地水准面

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摘要

In the framework of the GOCE-Italy project a solutionrnto improve at local level a global model using therndelivered GOCE data has been studied and tested.rnThe combination is based on a collocation procedurernconsidering as observations the spherical harmonicrncoefficients with their predicted error variances and arnlocal grid of the second radial derivative of therngravitational potential; this grid is estimated from GOCErnobservations at satellite level by using the space-wisernapproach. The use of local data, instead of the availablernglobal grids, gives the possibility to consider thernfull error covariance matrix of the gridded data intornthe collocation combination; this covariance matrix isrncomputed by Montecarlo simulations.rnThe method has been applied for the update of thernMediterranean geoid computed from the EGM08 modelrnat a resolution of 5’×5’ in the area between 28°N - 46°Nrnand 10°E - 37°W. The geoid corrections have an rms ofrnless than 1 cm, that increases to some cm over specificrnareas (e.g. Alps, Aegean plate, Cyprus). Regarding therncorrections of the global model coefficients, they arernconcentrated in the degrees from 70 to 220.rnThese corrections are quite small, probably due tornthe very good quality of the EGM08 model in Europernand to the fact that only the first two months of GOCErndata have been used. A more significant impact isrnexpected when considering a longer data period andrnwhen the method is applied in areas where only poor orrninadequate ground gravity data are available.
机译：在意大利GOCE项目的框架内，研究和测试了使用提供的GOCE数据进行全局模型改进的解决方案。该组合是基于搭配过程的，其中考虑了球谐系数及其预测误差方差和arnlocal网格。引力势的第二个径向导数；该栅格是通过使用空间明智的方法从GOCErnobservations在卫星级别进行估算的。使用局部数据而不是可用的全局网格，可以考虑将网格数据的完全误差协方差矩阵考虑为搭配组合。该协方差矩阵是由Montecarlo仿真计算的。该方法已用于更新由EGM08模型计算出的地中海水准面，分辨率为5'×5'，位于28°N-46°Nrn和10°E-37°W之间。大地水准面校正的均方根值小于1厘米，在特定的区域（例如阿尔卑斯山，爱琴海板块，塞浦路斯）上增加到几厘米。关于全局模型系数的校正，它们的集中度在70到220之间。这些校正量很小，这可能是由于EGM08模型在欧洲的质量非常好，以及仅使用了GOCErndata的前两个月这一事实。 。当考虑到更长的数据周期时，以及当该方法仅适用于地面重力数据差或差的地区时，将会产生更大的影响。

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