基于正射影像匹配的地形变化检测与更新算法

利用新时期的航空影像和旧时期的DEM,基于正射影像匹配的相关理论,提出了地形变化检测和数据更新的自动化算法,该算法能够利用两个时期的未变化信息进行控制,避免了传统的定向过程,极大减少了人工编辑,能够同时得到变化检测的结果、更新后的DEM和DOM。实验结果证明了该算法的实用性和高效性。

Approach for Terrain Change Detection and Updating Based on Orthoimage Matching

Based on theory relating to orthoimage matching,this paper presents a novel efficient and automatic approach for detecting terrain changes and updating old DEM simultaneously with up-to-date aerial imagery and outdated DEM.At first,orthoimage pair can be produced with provided aerial imagery pair,initial orientation elements and DEM by digital photogrammetry workstation.Through image matching on orthoimage pair,occurring parallax indicates change or error on the DEM surface.And the parallaxes are used for modifying the DEM and extracting changed area.Iterative procedure can make orientation elements and updated DEM more and more precise.Result of change detection,updated DEM and DOM can be achieved in the end.The approach can exploit unchanged information between two temporal data to control,avoid traditional orientation procedures,and reduce manual work greatly.Practicability and efficiency are verified by experiments.