کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
507605 | 865135 | 2012 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Software for generating gravity gradients using a geopotential model based on an irregular semivectorization algorithm Software for generating gravity gradients using a geopotential model based on an irregular semivectorization algorithm](/preview/png/507605.png)
The spherical harmonic synthesis of second-order derivatives of geopotential is a task of major concern when the spatial resolution of synthesis is high and/or a high-resolution Earth's gravity model is used. Here, a computational technique is presented for such a process. The irregular semivectorization is introduced as a vectorization technique in which one loop is excluded from matrix-vector products of mathematical models in order to speed up the computation and manage the computer memory. The proposed technique has the capability of considering heights of computation points on a regular grid. MATLAB-based software is developed, which can be used for generating gravity gradients on an ordinary personal computer. The numerical results show that irregular semivectorization significantly reduces the computation time to 1 h for synthesis of these data with global coverage and resolution of 5′×5′ on an elevation model. In addition, a numerical example is presented for testing satellite gravity gradiometry data of the recent European Space Agency satellite mission, the gravity field and steady-state ocean circulation explorer (GOCE), using an Earth's gravity model.
► The paper deals with a technique for vectorizing mathematical models for spherical harmonic synthesis on irregular surfaces.
► Software is presented based on the algorithm for synthesis of gravity gradients.
► The software is used to validate real satellite gradiometry data of GOCE.
Journal: Computers & Geosciences - Volume 39, February 2012, Pages 152–160