基于模拟数据分析地形校正模型效果及检验

对目前已有的多种地形校正模型(余弦校正模型、C校正模型、Minnaert模型、统计校正模型、SCS校正模型以及SCS C校正模型)的优缺点进行了详细的评价.分析了各种地形校正模型的起源和物理意义.采用数值模拟(Li-Strahler几何光学模型(GOMS))技术生成不同地形条件下的冠层反射率,并采用上述多种模型进行地形影响的消除,从理论上研究分析各种地形校正模型的特点.结果表明统计模型和C校正模型是这些地形校正模型中较好的模型方法.利用结果最优的模型方法对中国江西兴国县的地形进行校正试验,结果表明引入的C校正模型可以较优地进行地形影响的消除.

ASSESSMENT OF DIFFERENT TOPOGRAPHIC CORRECTION METHODS AND VALIDATION

Some typical topographic correction methods,such as band ratio model,Minnaert model,cosine model,SCS model,John model,statistic model and their C correction methods,are assessed in detail.First,the origin of all the topographic correction methods and their premise conditions are listed and analyzed.Geometric optical model system(GOMS) is used to create the canopy reflectance under different topographic conditions.And then all the topographic correction methods are used in the simulation and the topographic correction results are compared with the nadir reflectance in flat area.The assessment methods show that the statistic model and C correction model are the best method for diminishing or removing the effects of the topography.Finally,the performance of the best method is tested by Landsat TM data,in Xingguo testing area,Jiangxi province,China.The test result shows that the C correction method is the best method for diminishing and removing the effects of topography.