Research On The Automatic Layout Of Drone Image Control Points

Since the emergence of traditional aerial photography,UAV aerial photography technology is a new technology of digital aerial photogrammetry about surveying and mapping,which compared with the traditional aerial photogrammetry,it has characteristics of flexibility and is affected little by environmental weather with low cost.At present,digital orthophoto map(DOM)meet the requirements of 1:5000,1:2000 and 1:1000 scale precision by the usage of low altitude digital,and play a critical role in the land ownership rural project.POS system,also known as the IMU/DGPS system in sensor imaging process,is able to measure the position and attitude,exterior elements of image acquisition.However the UAV airframe is lighter and flight attitude is not stable enough,which lead that the POS data is not accurate enough.Therefore DOM products need a large number of photo control points to improve the accuracy of aerotriangulation with the usage of UAV.According to the different accuracy of the image,the image control points need to be arranged in the aerial images based on specification of the network type.A uniform and robust control network is the necessary condition to ensure the accuracy of aerotriangulation.In order to better play the role in rural land ownership project by using UAV image data,this paper has done the following aspects of research:(1)The error sources of UAV image data is analyzed,and the method is presented that use the software to correct the distortion of the image is studied;(2)Through research principle of the image control points layout requirements in deeply,this paper summed up defect and shortcoming of the traditional manual layout of control points.Integration improve the efficiency of image control points layout,which is a variety of layout scheme and the traditional operation method of layout mode on the control points;(3)Program of the C++language accomplish the improvement of the image control points layout mode based on the platform of Visual Studio2010,and the compared with the layout of the two measuring areas.The program mainly automatically design of networks and generating"map of control points distribution" with the help of POS auxiliary data according to control points density and adjacent to the route number in the interval.Based on the collinear equation,Each node of the control distribution network is matched to the position of the corresponding image points on the aerial images with the image control points of selectable range is generated.The utility model has the advantages of simple parameter setting,the normalized layout of the image control network type,efficient construction of mesh and matching.The utility model has high practical value.