| With the continuous maturity of digital photogrammetry technology,aerial photogrammetry technology has become an important method for mapping and mapping of basic scale topographic maps in China,and has been widely used.The indoor digital photogrammetry simulation system is a kind of simulated low-altitude photogrammetry system developed for the purpose of experimental research and teaching practice.It can solve the high cost of aerial photography,the flying site is easy to be restricted,and the safety factor is not high.It is difficult to coordinate the application of a series of difficult-to-actual problems in the airspace,and at the same time meet the teaching requirements of combining theory with practice.Based on the indoor digital photogrammetry simulation system,this paper designs the data acquisition process of the indoor digital photogrammetry simulation system based on the content of the aerial survey field work,summarizes the main process of the indoor digital photogrammetry simulation system to analyze the aerial triangulation and completes the production and quality inspection of digital products of research area.The main work of the thesis is as follows:(1)Introducing the composition of indoor digital photogrammetry simulation system;Based on the experimental system,the key steps such as route planning,digital image acquisition,and image control point joint measurement are designed and simulated in the field.The data acquisition process of the indoor digital photogrammetry simulation system is summarized.(2)Based on the indoor digital photogrammetry simulation system,the aerial triangulation is analyzed.It is verified by experiments that the initial external orientation elements of the image can effectively reduce the space processing time,increase the number of connection points and the accuracy of the regional free network adjustment image point.Analyze and compare the accuracy of checkpoints under different camera calibration methods,image control point layout,and image overlap scheme.The results show that the self-checking accuracy of the bundle adjustment method based on the indoor digital photogrammetry simulation system is better than that of the single LCD plane grid.The image control point layout method with four sides plus the center has the highest precision;increasing the image overlap degree can further improve the precision.(3)The production of related digital products was carried out based on the indoor digital photogrammetry simulation system.The digital elevation model DEM,the digital surface model DSM and the digital orthophoto map DOM were fabricated by two different algorithms.The production principle and process were compared and the DOM mapping accuracy and quality were analyzed.It provides a reference for practical production applications.The production process of the digital line drawing DLG is summarized.The quality and accuracy of the drawing are checked and evaluated.It is verified that the simulation of multi-lens tilt photography based on single-lens imaging system has certain feasibility at last. |
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