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首页> 外文会议>Proceedings of 4th international GOCE User workshop. >GLOBAL GRAVITY FIELD DETERMINATION BY COMBINING GOCE AND COMPLEMENTARY DATA
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GLOBAL GRAVITY FIELD DETERMINATION BY COMBINING GOCE AND COMPLEMENTARY DATA

机译：结合Goce和补充数据确定全球重力场

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摘要

GOCE gravity fields define a new standard concerningrnspectral resolution of satellite-only models, and providerna very high precision in the long- and medium wavelengthrnpart of the gravity field up to a spherical harmonicrndegree of about 250. Combining GOCE with GRACErndata, which gives in addition very accurate informationrnfor the long wavelength part, results in the current performancernstatus of satellite-only models. By addition of terrestrialrnand altimetry data the spectral expansion can bernenlarged even further, resulting in high-resolution gravityrnfield models. High-resolution global gravity field determinationrnbased on heterogeneous input data puts high demandsrnon computer resources, because full normal equationsrnsystems become very large, so that the assemblingrnand solution processes are challenging with respect tornmemory and computing time. Therefore parallel methodsrnhave to be applied. At IAPG computations combiningrnGOCE data with synthetic terrestrial data up to degree/rnorder 600 have been performed. They have shown,rnthat very large normal equation systems can be handled,rnconcerning the processing steps assembling, solving, inversionrnas well as error propagation. In this study realrnterrestrial data shall be added consistently to the satelliteonlyrnmodels. Here, further challenges like handling ofrninconsistent data sets and pre-processing of the terrestrialrngravity data occur. This contribution shall present ourrnfirst results of gravity field determination by using terrestrial,rnGOCE and GRACE data. The preparation and thernrelative weighting of the data sources shall be illustrated,rnanalyzed and discussed. The contribution of GOCE to therncombined model is explicitly visible.
机译：GOCE重力场定义了有关仅卫星模型的光谱分辨率的新标准，并且提供了重力场的长，中波长部分的非常高的精度，直到球谐度约为250。对于长波长部分的准确信息会导致仅卫星模型的当前性能状态。通过添加地面和测高仪数据，可以进一步扩大频谱扩展，从而生成高分辨率重力场模型。基于全输入数据的高分辨率全球重力场确定对计算机资源有很高的要求，因为完整的正规方程组变得非常大，因此组装和求解过程在内存和计算时间方面都具有挑战性。因此必须采用并行方法。在IAPG上，已经执行了将rnGOCE数据与合成陆地数据相结合（最高度/级别600）的操作。他们已经表明，关于组装，求解，反演以及误差传播的处理步骤，可以处理非常大的正则方程组。在这项研究中，应将地面数据一致地添加到仅卫星模型中。在这里，还会出现诸如处理不一致数据集和对地面重力数据进行预处理等其他挑战。该贡献将通过使用地面，GOCE和GRACE数据来介绍重力场确定的第一个结果。应当说明，分析和讨论数据源的准备和相对权重。 GOCE对组合模型的贡献是明确可见的。

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