| Tunnel Engineering Geologic Logging technology applies digital close-range photogrammetry theory, digital image processing technology and GIS technology, and provides basis for analyzing geological conditions. Based on the former products of geologic technology, the settings of coordinate system, collection of real data, transformations between objects and its images, generation of demonstration and digital logging of image in geologic logging system is concerned. The methods of image processing is studied which based on tunnel objective control, and the methods of processing of logging data by stages. The main contents as followings:1 .Aiming at the specialty of Complex Tunnel Engineering Geologic Logging, the exterior orientation algorithms about various kinds of tunnel image are studied which base on the tunnel Digital Close-Range Photogrammetry Machine is developed, and the automatic correction of exterior orientation factors with different form and different obliquity is achieved.2.Concerned with complicated tunnel projection, settings of coordinate system transformations between objects and its images is studied in this paper, simultaneously, demonstration and measuring methods has been generated. It achieved the automatic correction, enhancement, inlaying and computer assistant digital logging of tunnel images that is based on different forms of all kinds of tunnels.3.Based on the methods of digging by stages and stratifications, the issue of automatic inlaying, data by stages and stratifications, and optimized management are improved. Owing to those underground buildings that are not fitted to use image logging based image space control, this research studied the methods of tunnel object space control, which achieved the function that digital logging by object space control.4.The methods of photogrammetry Logging records, the precision appraisal and the accuracy control are discussed,theoretical precision of various deviations and logging results are analyzed which have an impact on geologic logging, and precision evaluation of geologic logging is loading which based on general digital camera. Combined with experiment, the practical precision of geologic logging is verified.Researches and applications indicated that the key technology and system development of complicated tunnel geologic logging satisfy the needs of quick logging based complicated tunnel, and enhanced the applicability that image geologic logging technology applies in engineering geologic logging.
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