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Analysis of Spectral Characteristics Based on Optical Remote Sensing and SAR Image Fusion 被引量:4
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作者 Weiguo LI Nan JIANG Guangxiu GE 《Agricultural Science & Technology》 CAS 2014年第11期2035-2038,2040,共5页
Because of cloudy and rainy weather in south China, optical remote sens-ing images often can't be obtained easily. With the regional trial results in Baoying, Jiangsu province, this paper explored the fusion model an... Because of cloudy and rainy weather in south China, optical remote sens-ing images often can't be obtained easily. With the regional trial results in Baoying, Jiangsu province, this paper explored the fusion model and effect of ENVISAT/SAR and HJ-1A satel ite multispectral remote sensing images. Based on the ARSIS strat-egy, using the wavelet transform and the Interaction between the Band Structure Model (IBSM), the research progressed the ENVISAT satel ite SAR and the HJ-1A satel ite CCD images wavelet decomposition, and low/high frequency coefficient re-construction, and obtained the fusion images through the inverse wavelet transform. In the light of low and high-frequency images have different characteristics in differ-ent areas, different fusion rules which can enhance the integration process of self-adaptive were taken, with comparisons with the PCA transformation, IHS transfor-mation and other traditional methods by subjective and the corresponding quantita-tive evaluation. Furthermore, the research extracted the bands and NDVI values around the fusion with GPS samples, analyzed and explained the fusion effect. The results showed that the spectral distortion of wavelet fusion, IHS transform, PCA transform images was 0.101 6, 0.326 1 and 1.277 2, respectively and entropy was 14.701 5, 11.899 3 and 13.229 3, respectively, the wavelet fusion is the highest. The method of wavelet maintained good spectral capability, and visual effects while improved the spatial resolution, the information interpretation effect was much better than other two methods. 展开更多
关键词 spectral characteristics Data fusion SAR Multi-spectral image Wavelet transform
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A Short Note on a Differential-Difference Gauge Transformation and a New Spectral Problem
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作者 陈奎 张大军 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第10期1-2,共2页
We show that a class of spectral problems are related to the spectral problem of the Volterra lattice through a gauge transformation. The transformation is given. We hope that our discussion can draw attention to the ... We show that a class of spectral problems are related to the spectral problem of the Volterra lattice through a gauge transformation. The transformation is given. We hope that our discussion can draw attention to the study of gauge transformation theory of differential-difference integrable systems. 展开更多
关键词 of or in WELL that is A Short Note on a Differential-Difference Gauge Transformation and a New spectral Problem been
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An Exact Propagator for Solving the Triatomic Reactive Schrodinger Equation
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作者 李学明 孙志刚 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2017年第6期761-770,I0003,共11页
The exact short time propagator, in a form similar to the Crank-Nicholson method but in the spirit of spectrally transformed Hamiltonian, was proposed to solve the triatomic reactive time-dependent schrodinger equatio... The exact short time propagator, in a form similar to the Crank-Nicholson method but in the spirit of spectrally transformed Hamiltonian, was proposed to solve the triatomic reactive time-dependent schrodinger equation. This new propagator is exact and unconditionally convergent for calculating reactive scattering processes with large time step sizes. In order to improve the computational efficiency, the spectral difference method was applied. This resulted the Hamiltonian with elements confined in a narrow diagonal band. In contrast to our previous theoretical work, the discrete variable representation was applied and resulted in full Hamiltonian matrix. As examples, the collision energy-dependent probability of the triatomic H+H2 and O+O2 reaction are calculated. The numerical results demonstrate that this new propagator is numerically accurate and capable of propagating the wave packet with large time steps. However, the efficiency and accuracy of this new propagator strongly depend on the mathematical method for solving the involved linear equations and the choice of preconditioner. 展开更多
关键词 Time-dependent wavepacket method spectral difference spectrally transformed Hamiltonian Exact short time propagator Reactive scattering
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Spectral method of analysis and optimal estimation in linear stochastic systems
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作者 K.A.Rybakov 《International Journal of Modeling, Simulation, and Scientific Computing》 EI 2020年第3期78-97,共20页
It is proposed to use the spectral form of mathematical description of control systems for modeling continuous-time Markov random processes described by linear stochastic differential equations with additive or multip... It is proposed to use the spectral form of mathematical description of control systems for modeling continuous-time Markov random processes described by linear stochastic differential equations with additive or multiplicative noise.The obtained results are applied to solve the output process analysis problem and the optimal estimation problem. 展开更多
关键词 ANALYSIS modeling ESTIMATION FILTERING SMOOTHING PREDICTION Markov process spectral method spectral transform stochastic differential equation
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A general n-th order spectral transform
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作者 Z. R. Bhatti (Department of Mathematics, Govt. Collage of Science Wahdat Road, Labors-54570, Pakistan) I. R. Durrani (Centre of Excellence in Soli. State Physics, University of the Punjab Labore-54590, Pakistan) S. Asghar (Department of Mathematics, Quaid 《Chinese Journal of Acoustics》 2001年第2期184-192,共9页
A general n-th order spectral transform and a technique for inverting this transform is described in this paper and the usefulness of the whole procedure is illustrated by the solution of a system of nonlinear Klein G... A general n-th order spectral transform and a technique for inverting this transform is described in this paper and the usefulness of the whole procedure is illustrated by the solution of a system of nonlinear Klein Gordon equations. 展开更多
关键词 A general n-th order spectral transform RE REAL
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