| 光谱学与光谱分析 |
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| Sandmeier Model Based Topographic Correction to Lunar Spectral Profiler (SP) Data from KAGUYA Satellite |
| CHEN Sheng-bo, WANG Jing-ran, GUO Peng-ju, WANG Ming-chang |
| College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China |
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Abstract The Moon may be considered as the frontier base for the deep space exploration. The spectral analysis is one of the key techniques to determine the lunar surface rock and mineral compositions. But the lunar topographic relief is more remarkable than that of the Earth. It is necessary to conduct the topographic correction for lunar spectral data before they are used to retrieve the compositions. In the present paper, a lunar Sandmeier model was proposed by considering the radiance effect from the macro and ambient topographic relief. And the reflectance correction model was also reduced based on the Sandmeier model. The Spectral Profile (SP) data from KAGUYA satellite in the Sinus Iridum quadrangle was taken as an example. And the digital elevation data from Lunar Orbiter Laser Altimeter are used to calculate the slope, aspect, incidence and emergence angles, and terrain-viewing factor for the topographic correction. Thus, the lunar surface reflectance from the SP data was corrected by the proposed model after the direct component of irradiance on a horizontal surface was derived. As a result, the high spectral reflectance facing the sun is decreased and low spectral reflectance back to the sun is compensated. The statistical histogram of reflectance-corrected pixel numbers presents Gaussian distribution. Therefore, the model is robust to correct lunar topographic effect and estimate lunar surface reflectance.
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Received: 2013-08-23
Accepted: 2013-12-22
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Corresponding Authors:
CHEN Sheng-bo
E-mail: chensb@jlu.edu.cn
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