Large-scale Mapping And 3D Modeling Research Based On Aerial Photography Of Drones

With the continuous development of Surveying and mapping precision fast,traditional satellite remote sensing and aerospace photogrammetry by rail,weather and other reasons can not return to the cycle and real-time observation of earth,low current,so as the carrier of the small UAV low altitude aerial remote sensing system came into being.The system has the advantages of high reliability,high security,flexibility and low cost,especially in high resolution digital mapping of small scale and large scale mapping.Study on UAV low altitude aerial system data acquisition,data processing,large scale map and 3D visualization of UAV aerial technology is necessary,which is conducive to the overall development of traditional land surveying,digital city construction and geographical conditions monitoring,disaster emergency surveying and mapping of large scale terrain.In this paper,the research status of domestic and abroad is introduced.Based on the production process of the UAV's large scale mapping,this paper introduces the structure and related theoretical basis of aerial remote sensing system for low altitude UAV.In this paper,the evaluation system of UAV aerial photography quality is described,and the acquisition process,image preprocessing and matching are analyzed.Based on the specific project of 1:2000 in large scale topographic map production process as an example,focuses on the whole process of UAV aerial images from acquisition to topographic mapping and 3D Modeling Visualization,focuses on the effects of several factors and put forward the improvement methods of map accuracy.At the same time,the 3D modeling and visualization analysis based on the existing topographic maps are carried out.Relying on the national highway 219 line to Xichou Shimonoseki section of highway reconstruction project,the use of Inpho software,super VirtuoZo mapping system and ArcGIS software not in-depth study of the whole process analysis and visualization of large scale aerial measuring machine.Through the analysis of the precision and the large scale topographic map of aerial UAV image production to meet the mapping accuracy requirements,based on the enhancement from UAV hardware performance,equipped with differential equipment,integrated UAV mapping system and other aspects to improve the accuracy of map,and finally through the three dimensional modeling visualization analysis,realization of roaming and release the model of 3D scene.