【摘要】 通过多时相DEM探测泥石流地区地表形变,必须建立DEM的统一坐标系,才能计算地表形变量。引入无控制三维表面匹配技术,提出分块区域匹配方法配准两期DEM。实例试验表明:分块区域匹配方法比现有的M—LZD算法更能适合泥石流灾害地区的DEM匹配,探测出的地表变化精度更高。更多还原

【Abstract】 The volume of terrain deformation caused by debris flow can be calculated by the multi-temporal DEM derived from aerial-photography only when they are in common coordinate.This paper introduces the technique of 3D surface matching without using control points.A new algorithm,Multiply Surface Patches Matching(MSPM),is proposed to match the two temporal DEMs.The experimental results on real data sets show that MSPM is more appropriate for DEM matching in debris-flow area and has higher accuracy than that of M-LZD algorithm.更多还原