The Fusion of Photogrammetric Image and Laser Scanning Data

초록

Airborne Laser Scanning which is being rapidly developed last few years provides us high density and accurate Digital Terrain Model and Digital Surface Model. But, planimetric accuracy of ALS is 2-5 times worase than height accuracy. This problem directly affects the quality of large scale orthoimage in urban areas because of the breaklines. So it is in great demand to develop new technology for generation of accurate DSM in urban area. This paper deals with the fusion of photogrammetric image and laser scanning data to improve ALS DSM. Using characteristic geomorphologic lines and points extracted from ALS DSM as priori approximation, we locate exact characteristic geomorphologic lines and points in the stereo images and refine ALS DSM.