STUDY ON KEY TECHNOLOGIES OF VEHICLE-BORNE MOBILE MAPPING SYSTEM INTEGRATED WITH GPS / INS / CCD CAMERAS

Direct positioning and data acquisition system, composed of global positioning system (GPS), inertial navigation system (INS), laser ranging technique and digital photogrammetry, is a fast data acquiring technique developed in the field of surveying and mapping in recent years. Focusing on data acquisition based on vehicle-borne mobile mapping system integrated with GPS/INS/CCD cameras, this paper studies such key technologies as system calibration and stereo image matching. Through the system calibration, the paper gives direct positioning equation of vehicle-borne stereo photogrammetry system, which can work out 3D geospatial coordinates of pixel directly. Through stereo image matching, conjugate points in stereo image can be automatically found. Furthermore, the paper develops 3D data acquisition system based on vehicle-borne stereo images, and gives experimental results by taking real geospatial coordinates collection of ground objects as examples. The experimental results show that vehicle-borne mobile mapping system can play an important role in acquisition, processing and model construction of city 3D spatial information efficiently, quickly and accurately.

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