Using TOPEX altimeter data, a few new earth gravity models, geoid models and ocean tide models were generated, and these models were better than old models.

利用TOPEX资料可以得到新的地球引力场、海洋大地水准面和海潮模型。

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The first maps not only record the three components but also compare their signals to the best available gravity field models assembled from existing space- and ground-acquired data-sets.

BBC: Europe's Goce satellite probes Earth's gravity

The duo are actually building two different models: the simple, gravity-powered Glide and the motorized Flow.

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