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Bi W.,Urumqi Jinwei Map character Information and Science and Technology Co. | Liu Y.,Institute of Geochemistry Chinese Academy of science
Wutan Huatan Jisuan Jishu | Year: 2014

In order to easily model topography in field work, on the basis of predecessors' achievements, the arbitrary quadrilateral element grid was used in the finite element method (FEM), and the electromagnetic field of models were designed to bilinear variation within each quadrilateral element in our numeric modeling. We deduced the specific formula to calculate the unit coefficient matrix by Gaussian numerical integral and the expression of the auxiliary field when using arbitrary quadratic element. Model calculation shows that the mean square error between the simulation results with the analytical solution is less than 1 percent, and the results of terrain model is consistent with the one of other scholar's. Through modeling of two ramp terrain modes with different pitch, comparing and analyzing the effect of the apparent resistivity and the phase. Due to the use of arbitrary quadrilateral element grid, the difficulty of programing was reduced, forward modeling can be more easily adapt to the topography variation. Source


Yuan X.-L.,Geophysical and Geochemical Party | Yuan X.-L.,Urumqi Jinwei Map character Information and Science and Technology Co. | Duan X.-L.,Geophysical and Geochemical Party | Duan X.-L.,Urumqi Jinwei Map character Information and Science and Technology Co. | And 2 more authors.
Wutan Huatan Jisuan Jishu | Year: 2013

In order to realize 3D visualize of the geophysical and geochemical data, we can make discrete data of geological survey to gridding data, then render the grid to screen with OpenGL. This paper describes how to use OpenGL to render and edit 3d scence, and introduces the methods of dealing with large gridding data. Source

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