Feng L.,Chinese Academy of Geological Sciences |
Jianpingb C.,The Land Resources Information Development and Research Key Laboratory of Beijing |
Miaob Y.,The Land Resources Information Development and Research Key Laboratory of Beijing |
Fuxiub G.,The Land Resources Information Development and Research Key Laboratory of Beijing |
And 3 more authors.
Computers and Geosciences | Year: 2013
The palaeocontinental reconstructions have been a hot issue in global tectonics and geodynamics research. In addition, the development of computers promises new methods and means for quantitative analysis of the palaeocontinental reconstructions. Therefore, the Palaeocontinental Reconstructions Simulation System (PRSS) was independently developed using a set of methods based on paleomagnetism, computer models of plate tectonics, motion characteristics on a spherical surface and relevant mathematical algorithms to analyse quantitatively and simulate dynamically plate motions during geologic history. Also, we concluded that the method of reconstructions, especially for small terranes from Mesozoic, could be summarized into four steps: (1) reconstruct the absolute positions at several different geological ages on the basis of paleomagnetic data which constrain palaeolatitude; (2) use a variety of information (e.g., palaeontology, lithofacies, paleoclimate etc.) to constrain palaeolongitude; (3) construct Euler poles to describe relative motion for each pair of continents; and (4) calculate Euler poles by concatenating Euler poles of relative motion to determine continents motion history. Practical application effect proves that this method and the software can accurately simulate and intuitively show the state and the trajectories of plate's motion at different stages in the geologic history, which provides a solid foundation for research on geologic history and geodynamics. The paper gives a detailed description of the functions and relevant algorithms of PRSS. © 2013.
Wang X.,China University of Geosciences |
Wang X.,The Land Resources Information Development and Research Key Laboratory of Beijing |
Chen J.-P.,China University of Geosciences |
Chen J.-P.,The Land Resources Information Development and Research Key Laboratory of Beijing |
And 6 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2012
Through analysis of solar azimuth of Chang'E-1 IIM data, the data of high-angle were chosen to do radiometric calibration. The method of neighbourhood averaging and neighbourhood weighted averaging were adopted to repaire original data which contains bad points and bands. Because of interference imaging spectrometer's inherent problem and CCD array gain distortion, the image displays discontinuity of transverse response. By using the method of subspace maximum eigenvalue to cablibrate image, the statistical result of processed images shows homogeneity on intensity of radiance. The empirical linear method was adopted to calibrate IIM data absolutely. Meanwhile, in order to correct bias coefficient of data which has been calibrated and de-noised, the method of wavelet transform was adopted to modificate data of radiometric calibration for the first time, the final available IIM 2C data were confirmed. Compared with the data which has been accredited, the analysis proposal of IIM 2C data was established. Then the first reflectivity image of the lunar nearside based on Chang'E-1 IIM 2C was accomplished.