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이재기 ( Jae Kee Lee ) 충북대학교 건설기술연구소 2011 建設技術論文集 Vol.30 No.1
The spatial information is constructed by ``Si`` or ``Gun`` units. It cannot be periodically reconstructed or updated regularly because it requires much time and cost. The 3D spatial information can be updated using digital maps, which are updated every two years for metropolitan areas and every four years for the rest. The update of the 3D spatial information using digital maps is disadvantageous, because the changes that occur between the updates cannot be applied. Therefore, an on-demand update system is required, instead of the periodic bulk update system with two to four year intervals. This study proposed a method of acquiring aerial images of cities where geographic features, such as terrain and objects often change, by installing a camera in an UAV(Unmanned Aerial Vehicles); and a technique for constructing or frequently updating the 3D spatial information using the acquired aerial images. Thus, this study was conducted to reduce the cost and time for updating, minimize overlapping investments, and improve the quality and reliability of 3D spatial information.