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Abstract

This abstract presents a new technique for creating geoids of high resolution and precision. The first step is to find unique and stable models of the mass distribution in Earth’s core, mantle and crust. This is followed by computation of the gravity potential of the optimized models which are used to find the geoid’s surface. The created models consist of finite number of point-masses and the initial data are the absolute values of the gravity acceleration on Earth’s surface. The Gauss-Newton method combined with an additional regularization algorithm is used in order to fulfil the optimization. The approach is tested upon gravity data taken from the GRACE Gravity Model 02 (GGM02C) released October 29, 2004 and published to the public on http://www.csr.utexas.edu/grace/gravity/. Currently, the optimized models enclose 177 point-masses. This gave us the opportunity to compute the European geoid on a 0.5°x0.5° grid with 134 cm accuracy. It’s obvious that by a continuous increment of the number of point-masses the method will not only reach but overtake the current geoid heights accuracy on a relatively simple and economical way. The only obstacle for the method is the higher computational cost of the procedure.

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/content/papers/10.3997/2214-4609.20131728
2013-10-07
2021-10-16
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20131728
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