Research On Error Analysis And Quality Control On Photogrammetry Based On DMC

The Digital Mapping Camera (DMC), emerged in the early twenty-first century, is an important milestone in the development of aerial photography cameras. Its characteristic feature, direct access to digital aerial imageries, broke the long time film monopoly on recording aerial imageries. The DMC pulls aerial photography technology out of the era of digital photogrammetry and into the era of full-digital photogrammetry. This advance will greatly promote innovative research and engineering applications in the area of aerial photogrammetry technology.Although, the DMC’s composition, imaging format, and image recording method are completely different from that of film aerial photography camera, its advantage is higher internal geometry stability than the film aerial photography camera. Thus, the aerial industry favored the launch of the DMC despite its differences, and so it has been widely used in actual projects since its introduction.In china, although the DMC device was introduced earlier than others in the area of aerial photography, some important issues remain to be resolved. For aerial imageries produced by film aerial photography cameraes, the related technical standards and specifications are fairly comprehensive, the engineering processes are mature, and quality control measures are very complete. However, they cannot be directly adopted in practical applications with DMC, especially concerning techniques and quality control. These limit the application and promotion of DMC system more widely.In order to establish appropriate measures of quality control, in relation to problems with DMC in practical applications, this paper conducted a comprehensive, in-depth research on DMC’s imaging characteristic, the existing sources of error, and techniques and quality requirements throughout the entire full-digital photogrammetry production processes.The major works and contributions of this thesis are as follows: 1) A detailed analysis was executed, including the DMC, its error characteristics and the calibration of imaging charge coupled device (CCD). The installation protocols and imaging principles of four panchromatic lenses, and the virtual image fusion principles are also be studied. A splicing error in the DMC virtual image is minned out by studying the imaging principle of DMC virtual images and analyzing its error characteristics. This splicing error is inversely proportional to the ratio of the elevation difference of the photography area to the flying height. Therefore, it will influence the height accuracy in stereo-measurement using DMC images. However, this error can be reduced by dividing a photography area into subareas and ensruing the height difference in any subarea to some degree.2) Based on the analysis of the techniques and quality requirements for aerial photography, the key factors of quality control of aerial photography are explored. Based on this research, this paper pinpoints that the aerial photography area topography is the key factor that influences the quality of aerial photography technical designs.3) Research results illustrate that the DMC virtual splice error and the quality of aerial photography technical design are both influenced by the topography of the aerial photography area. After detailed analysis of existing aerial photography technical design methodologies, and the characteristics of the assisted aerial photography technical design software, this paper pinpoints faults in existing aerial photography technical design methods. He proposes that the use of digital elevation model data in photography area subdivision and aerial photography technical design will reduce error and ensure quality. Based on this research, the paper designed and developed an aerial photography planning and management system using DEM. The system has many functional modules, including multi-year planning, one-year planning, area subdivision, area technical design, and quality auto-check for aerial photography products. The development of this system closes the software gap in China’s aerial photography technical design system. 4) Based on the full-digital photogrammetry technique workflow, the paper discusses the quality control methodology for aerial photography, assisting aerial photography and photo control surveying results. To ensure the accuracy of regional network triangulation with DMC images, a means is proposed, that is to optimize the layout of photo control points, thus reducing the control surveying workload and improving photogrammetry efficiency and quality.5) DMC aerial device are widely available, that represents a real change in aerial photogrammetry from digital photogrammetry to full-digital photogrammetry. This paper responds to this change and researchs into the factors that affect the level of operating efficiency through conducting a detailed comparative analysis of the DMC’s efficiency to RC30aerial device in three fields of aerial photography, photo control surveying and aerial triangulation. The theoretical foundation will be provided for further research on raising the production efficiency of aerial photogrammetry with this paper research result.