Study And Application Of Digital Close-range Photogrammetry Based On Ordinary Digital Image

The emergence of the ordinary digital images (which in this paper means the digital images acquired by common non-metric digital cameras), resolved the the problem of acquiring images quickly on the spot, and lowered the requirement for equipments and skills in photogrammetry, so that made photogrammetry a whole digital process. But all current ways to the measurement of ordinary images are based on DLT or Bundles theory, which both require a lot of control points distributing properly, and are inapplicable.In order to increase the adaptability and accuracy of digital close-range photogrammetry based on common digital cameras, researches and experiments have been done on these methods in this paper, as following:1. the measurement and alteration of ordinary digital camera. It includes the correction of lens distortion of digital cameras, the computing of camera interior orientation parameters and pictures' exterior orientation parameters, and the evaluation of it's capability;2. the space resection and evaluation of it's accuracy;3. Researches on the stereophotogrammetry of digital images , which include relative orientation, absolute orientation , image matching and the evaluation of their accuracies;4. the methods of digital projection based on DSM;Researches and experiments illustrated that the measurement and alteration of common digital camera is successful, Researches and improvements in basic algorithm Which is applicable to photogrammetry based on ordinary digital images is accurate and dependable, this photogrammetric techniques and methods based on ordinary digital images can be applied extensively in engineering which requests a moderate accuracy.Aimed at the actual application of the researches on photogrammetric techniques and methods based on ordinary digital images, this paper recounts the development of a Digital Image Geologic Logging Information System which has taken into consideration the requirement of the construction of hydroelectric project. It's principal content includes the following aspects:1. theories and methods of photogrammetric geologic logging with a accuracy control system;2. digital image processing and logging algorithm in digital photogrammetric geologic logging;3. the development of a digital image geologic logging information system;The Digital Image Geologic Logging Information System in this paper, which integrates digital c lose-range photogrammetry ,digital image processing and GIS, has been applied in some large constructions of hydroelectric project such as LongTan hydroelectric engineering. This system hopes to change traditional operation mode of geologic logging, and brings a new technique to replace the old ones in hydroelectric project.