Abstract: In order to solve the deficiency and limit of using “4-point photogrammetric method” in 2D surveying of traffic accident scene, an improved 4-point surveying method was proposed, which was based on Small Unmanned Aircraft Vehicle (SUAV). First, the traffic accident scene images are capture by SUAV. Second, the captured images are transmitted back to the image pickup device immediately, and a pre-normalized approach for control point information processing is applied to reduce pathological situation of matrix calculation in the correction process. Then, the image correction algorithm is employed to rectify the perspective image to orthographic image. Finally, an image measuring module is used to measure, record and mark the information on the basis of the orthographic image. A control field test and an accident cased were used to validate the proposed method. Compared with the traditional manual surveying and photogrammetric method, the proposed method can not only improve the accuracy of accident scene surveying, but also expand the scope of the investigation, and constrain the impact of project angle on the accuracy of 4-point photogrammetric method.

Key words: engineering of communication and transportation system, traffic accident, photogrammetry, improved four-point method, small unmanned aircraft vehicles(SUAV)