Research On Quality Control Of UAV Low-altitude Aerial Photography Image DOM Generation Based On DPGrid

At low altitude,the collection of remote sensing images in a certain region can be completed quickly by UAV.At the same time,conducived to the rapid development of high-resolution surveying and mapping.Encouraging and supporting the development of drones and photogrammetry software is conducive to promoting the development of the surveying and mapping industry,and at the same time,has a positive impact on the development of the national economy,geographic national surveys,digital city construction,and surveying and mapping.The DOM can not only be used as the background control information for map analysis,but also provide more reference information for other basic geographic information products.It has outstanding performance in urban and rural construction planning and disaster prevention and management.As the use of large-scale digital orthophoto products continues to expand,all sectors of society set a higher demand for digital orthophotos.The following is the main research content of this articleFirst of all,this article focuses on the unmanned aerial photography and DPGrid low-altitude aerial photography system.Specifically,the Dajiang Phantom 4 pro and DGI GO4,Umap flight control software and post-processing software of DPGrid system are further discussed.The second,analyzing the key technical points that affect the accuracy and quality of the product in each link of digital orthophotographic generation,from the common problems and countermeasures of aerial photography,the key points of air triple encryption to the common problems and countermeasures in DOM production.The third,the focus is on the selection of suitable editing parameters and filtering methods for different features,so that the problematic DEM point cloud generated by automatic dense matching in DEM production can be cut to the ground.made further analysis and research on the key technologies and points that affect the accuracy and quality of DOM products in each link to improve the quality of digital orthophotos.The last,taking an area in Zhenping County,Nanyang City,Henan Province as an example.The entire process from the acquisition of aerial photography images to theproduction of digital orthophotos has been studied.Key research and analysis of key links such as the layout plan of control points,air three encryption,etc.,and finally generate the area 1:1000 orthophoto map.Through orthophoto quality inspection,the accuracy and quality of products are analyzed.The production examples show that the quality of the orthophotos produced by the DPGrid system meets the requirements of relevant specifications,thus meet the urgent need for digital orthophotos from all sectors of society.