混合像元光谱特征影响因子分析

Study on the Main Influencing Factors of Mixed-Pixel Spectral Characteristics

高光谱遥感能够提高地物识别和分类,通过光谱比较和匹配达到分类识别目的。由于传感器空间分辨率以及地面复杂多样性的差异,混合像元在遥感图像中普遍存在。混合像元的分解问题是定量遥感应用中的一个突出问题,如何有效地解译混合像元是遥感应用的关键问题之一。研究了面积比始终为1∶1的两种材料形成的混合像元在不同入射天顶角和不同拓扑位置分布时的高光谱反射比曲线的特征与差异,为混合像元分类精度的提高提供科学依据。

Hyperspectral remote sensing can improve the identification and classification of surface features through the spectrum comparing and matching to achieve classification and recognition.Because of the spatial resolution of the sensor as well as the difference in complexity and diversity on the ground,mixed pixels in the image are prevalent in remote sensing.The problem of subpixel unmixing is a prominent issue in the quantitative application of remote sensing.How to effectively interpret the mixed-pixel is one of the key issues in the application of remote sensing.In the present paper,the hyperspectral reflectance characteristics of the mixed-pixels formed with two kinds of materials whose area ratios have always been 1∶1 were studied at different incident zenith angles and different topology location distribution,which provides a theoretical basis for the mixed pixel classification accuracy improvement.