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오연곤,배억안,최경아,이임평,Oh, Youngon,Bui, An Ngoc,Choi, Kyoungah,Lee, Impyeong 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
Accidents in which oil spills occur intermittently in the ocean due to ship collisions and sinkings. In order to prepare prompt countermeasures when such an accident occurs, it is necessary to accurately identify the current status of spilled oil. To this end, the Coast Guard patrols the target area with a fixed-wing airplane or helicopter and checks it with the naked eye or video, but it was difficult to determine the area contaminated by the spilled oil and its exact location on the map. Accordingly, this study develops a technology for direct ortho-rectification by automatically geo-referencing aerial images collected by the Coast Guard without individual ground reference points to identify the current status of spilled oil. First, meta information required for georeferencing is extracted from a visualized screen of sensor information such as video by optical character recognition (OCR). Based on the extracted information, the external orientation parameters of the image are determined. Images are individually orthorectified using the determined the external orientation parameters. The accuracy of individual orthoimages generated through this method was evaluated to be about tens of meters up to 100 m. The accuracy level was reasonably acceptable considering the inherent errors of the position and attitude sensors, the inaccuracies in the internal orientation parameters such as camera focal length, without using no ground control points. It is judged to be an appropriate level for identifying the current status of spilled oil contaminated areas in the sea. In the future, if real-time transmission of images captured during flight becomes possible, individual orthoimages can be generated in real time through the proposed individual orthorectification technology. Based on this, it can be effectively used to quickly identify the current status of spilled oil contamination and establish countermeasures.
전일서(Ilseo Jeon),함상우(Sangwoo Ham),오연곤(Youngon Oh),최경아(Kyoungah Choi),이임평(Impyeong Lee) 대한공간정보학회 2019 한국지형공간정보학회 학술대회 Vol.2019 No.11
드론에 활용할 수 있는 센서 기술이 발전해오고 있다. 이에 따라 이전에 낮은 해상도로 사용하기 어려웠던 열영상을 광학 영상과 함께 사용할 수 있는 카메라를 활용할 수 있게 되었다. 본 연구에서는 기존에 사용하던 광학영상의 직접 지오레퍼런싱을 열영상에 적용하였다. 열 영상의 직접지오레퍼런싱을 결정하는 관계 행렬과 번들조정으로 결정된 관계행렬을 비교하여 영상 좌표계의 X축 방향, Y축 방향으로의 오차의 차이를 수치로 확인하였다. X축 방향으로는 평균 약 15도, Y축 방향으로는 평균 약 14도 차이가, Z축 방향으로는 약 20도 차이가 나는 것을 확인하였다. 사용한 드론이 큰 기체의 고정익이기 때문에 허용 가능한 오차로 확인되었고, 열 영상의 직접 지오레퍼런싱한 모습을 확인하였다.