Landsat影像地形校正方法的适用性分析

Analysis on the applicability of the topographic correction models for Landsat images

比较了Cosine校正模型、C校正模型、SCS+C校正模型和Minnaert校正模型在我国复杂地形区域进行遥感影像地形校正的效果.以江西、陕西、云南、大兴安岭东北为研究区域,共96景Landsat影像,基本涵盖了我国典型的山区地貌.每景影像每一波段(1,2,3,4,5,7)的最适宜地形校正方法通过光照系数(太阳入射角余弦值)与像元值的相关性系数平方得出.对于整个研究区域,最佳的地形校正方法的选择基于最适宜方法所占比例和Wilcoxon符号秩检验的显著性分析.实验结果表明C校正模型在我国适用性最为广泛,其次是SCS+C校正模型,这为大范围研究区域地形校正方法选择提供了较好的借鉴.

In this study, the effect of the four topographic correction models （i. e. cosine correction model, C correction model, SCS＋C correction model and Minnaert correction model） for the topographic correction in the regions with rugged terrain in China were compared. 96 Landsat scenes of the study areas including Jiangxi, Shanxi and Yunnan provinces, and the northeast Greater Khingan Mountains cover the most typical moun tainous areas of China . The most suitable topographic correction method for each Land- sat scene in each band （1, 2, 3, 4, 5, 7） was selected according to the square of the cor- relation coefficient between cosine values of solar incidence angles and DN values of the band. As to the whole study region, the best topographic correction method was deter- mined by the proportion of the most suitable method among the 96 scenes as well as the significant analysis of Wilcoxon Signed Rank Test . The result shows that C correction model is the most widely suitable topographic correction model for China and with SCS＋C correction model as the second suitable model. The result provides reference for the selection of topographic correction methods in other large areas.