For the building shadow in downtown area,it adopts the Shadow Automated Extraction Method of IKONOS Images Based on Image Fusion to extract and the Lamber model to rectify;

• 对城区建筑物阴影,采用基于影像融合的IKONOS影像阴影自动提取方法对阴影进行提取,再采用郎伯模型进行校正;