光谱学与光谱分析 |
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Influence of Surface Roughness on Degree of Polarization of Biotite Plagioclase Gneiss Varying with Viewing Angle |
XIANG Yun1,2,YAN Lei1*,ZHAO Yun-sheng3,GOU Zhi-yang1,CHEN Wei1 |
1. Beijing Key Lab of Spatial Information Integration & Its Applications, Peking University, Beijing 100871, China 2. Hebei Meteorological Institute & Hebei Key Lab of Meteorology and Eco-environment, Shijiazhuang 050021, China 3. College of Urban and Environmental Science, Northeast Normal University, Changchun 130024, China |
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Abstract Polarized reflectance is influenced by such factors as its physical and chemical properties, the viewing geometry composed of light incident zenith, viewing zenith and viewing azimuth relative to light incidence, surface roughness and texture, surface density, detection wavelengths, polarization phase angle and so on. In the present paper, the influence of surface roughness on the degree of polarization (DOP) of biotite plagioclase gneiss varying with viewing angle was inquired and analyzed quantitatively. The polarized spectra were measured by ASD FS3 spectrometer on the goniometer located in Northeast Normal University. When the incident zenith angle was fixed at 50°, it was showed that on the rock surfaces with different roughness, in the specular reflection direction, the DOP spectrum within 350~2 500 nm increased to the highest value first, and then began to decline varying with viewing zenith angle from 0° to 80°. The characterized band (520±10) nm was picked out for further analysis. The correlation analysis between the peak DOP value of zenith and surface roughness showed that they are in a power function relationship, with the regression equation: y=0.604x-0.297, R2=0.985 4. The correlation model of the angle where the peak is in and the surface roughness is y=3.419 4x+51.584, y<90°, R2=0.817 7. With the detecting azimuth farther away from 180° azimuth where the maximum DOP exists, the DOP lowers gradually and tends to 0. In the detection azimuth 180°, the correlation analysis between the peak values of DOP on the (520±10) nm band for five rocks and their surface roughness indicates a power function, with the regression equation being y=0.582 2x-0.333, R2=0.984 3. F tests of the above regression models indicate that the peak value and its corresponding viewing angle correlate much with surface roughness. The study provides a theoretical base for polarization remote sensing, and impels the rock and city architecture discrimination and minerals mapping.
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Received: 2010-11-14
Accepted: 2011-05-08
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Corresponding Authors:
YAN Lei
E-mail: lyan@pku.edu.cn
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