Study on the Nonlinear Characteristics of the Mixed Pixel’s Reflectance in Hyperspectral Space
ZHU Feng1, GONG Hui-li1*, SUN Tian-lin2, ZHAO Yun-sheng2
1. College of Resources and Environment and Tourism, Capital Normal University, Beijing 100048, China 2. College of Urban and Environmental Science, Northeast Normal University, Changchun, 130024 China
Abstract：Under the experimental condition of the 50 degree incidence zenith angle and 45 degree detection azimuth, 24 groups of reflectance spectral of the mixed pixel of lotus and water body acquired using the reflex platform and FieldSpec 3 Hi-Res portable spectrum instrument. The hyperspectral space was built based on the reflectance character. The relationship between similarity and the index of lotus area ratio was analyzed using the linear, logarithm and quadratic curve fitting, and the goodness of fitting is 63.6%, 76.2% and 82.9% respectively. According to the real relationship of the mixed pixel spectral vector and the reference spectral, the best fitting model has nonlinear characteristics. The idea that the mixed pixel may have the critical value was proposed on the base of the analysis. The research result will help understand the mixed pixel further, and provide a new direction for unmixing the mixed pixel.
朱 锋1, 宫辉力1*，孙天琳2, 赵云升2 . 高光谱空间中混合象元非线性反射特征研究 [J]. 光谱学与光谱分析, 2013, 33(03): 737-740.
ZHU Feng1, GONG Hui-li1*, SUN Tian-lin2, ZHAO Yun-sheng2 . Study on the Nonlinear Characteristics of the Mixed Pixel’s Reflectance in Hyperspectral Space . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(03): 737-740.
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