Software for generating gravity gradients using a geopotential model based on an irregular semivectorization algorithm
2012 (English)In: Computers & Geosciences, ISSN 0098-3004, E-ISSN 1873-7803, Vol. 39, 152-160 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
The Netherlands: Elsevier, 2012. Vol. 39, 152-160 p.
Computer Science, Interdisciplinary Applications; Geosciences, Multidisciplinary
Research subject SRA - E-Science (SeRC); SRA - E-Science (SeRC)
IdentifiersURN: urn:nbn:se:kth:diva-61338DOI: 10.1016/j.cageo.2011.06.003ISI: 000300751400016ScopusID: 2-s2.0-84855560548OAI: oai:DiVA.org:kth-61338DiVA: diva2:478929
FunderSwedish e‐Science Research Center
QC 201201302012-01-172012-01-172012-04-11Bibliographically approved