Abstract: The UAV platform can only be equipped with non-metric digital camera that has large lens distortion,and can not be equipped with high precision GNSS/IMU system,while the UAV flight attitude is not stable,which has led to the low vertical accuracy of UAV aerial photography.To solve the above problems,this paper corrects image distortion through the experiment in GPS-supported aerial triangulation presents that camera calibration, and obtains the more accurate coordinates of the center of camera station by using differential GPS, and increases image overlap and improve the stability of the model by controling strips.The experimental results show that the camera calibration,differential GPS and control strip can not only improve the vertical accuracy of GPS-supported bundle adjustment,but also can effectively reduce the number of the ground control point.It has more reference value for belt topographic map.

Key words: unmanned aerial vehicle, low-altitude photogrammetry, non-metric digital camera, vertical accuracy