[논문]항공사진과 CORONA 위성영상을 이용한 영동지역 해안선 변화 분석

안승효; 김기홍; 이한나

doi:10.7848/ksgpc.2022.40.3.187

항공사진과 CORONA 위성영상을 이용한 영동지역 해안선 변화 분석
Analysis of Coastline Changes in Yeongdong Region Using Aerial Photos and CORONA Satellite Images 원문보기

한국측량학회지 = Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, v.40 no.3, 2022년, pp.187 - 193

안승효 (Inter-Department Collabortory Program in Spatial Information Science, Gangneung-Wonju National University) , 김기홍 (Dept. of Civil Engineering, Gangneung-Wonju National University) , 이한나 (Inter-Department Collabortory Program in Spatial Information Science, Gangneung-Wonju National University)

초록
AI-Helper

강원 영동지방에서 연안은 문화적, 사회적, 경제적으로 중요한 자원이다. 그러나 강원도 해안은 다른 지역과 비교하여 매우 심각한 침식을 겪고 있으며, 이로 인한 피해가 점차 증가할 것으로 우려된다. 본 연구에서는 강원도 양양 남대천 하구 주변과 강릉 옥계 해변의 장기간에 걸친 해안선 변화를 추적하고 분석하였다. 시계열 영상자료를 구축하기 위해 해방 직후부터 최근까지의 항공사진을 주로 이용하였으며, 1960년대부터 70년대 초까지 운용된 CORONA 위성영상을 수집하여 함께 활용하였다. 51cm 해상도 정사영상과 2m 해상도 수치고도모형(DEM)을 이용하여 기준점을 설정하고 항공사진과 위성영상을 기하보정하였다. 이들 영상에 Canny 경계검출 연산자를 적용하여 해안선을 추출하고 벡터화하였다. 해안선을 해방 직후부터 시간 순서대로 중첩하여 분석한 결과, 인공 구조물 주변과 인근 해변에서 발생한 침식과 퇴적을 관찰할 수 있었으며, 구조물 건설 시점을 전후한 주변 해안선 변화도 관찰할 수 있었다. 다만 본 연구에서는 해안선의 계절적 변화와 조석, 그리고 양빈사업을 비롯한 각종 해안침식 방지사업에 따른 영향은 고려되지 않았다. 해안침식은 지리적 요인에 크게 영향을 받기 때문에 지역마다 원인과 해결방안이 다르며, 따라서 지자체별로 지속적인 연구와 데이터 축적이 필요하다.

Abstract ▼ AI-Helper

In the Yeongdong region of Gangwon-do, coastal areas are important resources in terms of cultural, social and economic aspects. However, the coast of Gangwon-do is experiencing severe erosion, and it is concerned that its adverse effects will gradually increase. In this study, coastline changes of Yangyang and Gangneung in Gangwon-do were tracked and analyzed over a long period of time. In order to build time series image data, aerial photos from the 1940s to the present were mainly used, and data from CORONA satellite, which operated from the 1960s to the early 1970s, were collected and used together. Using 51cm resolution ortho image and 2m resolution Digital Elevation Model(DEM) as reference, ground control points were selected to perform geometric correction on the aerial photos and CORONA images. Subsequently, Canny edge detector applied to these images to extract the coastlines. As a result of analyzing the extracted and vectorized coastlines by overlaying them in chronological order, erosion and deposition occurring around the artificial structures and on the nearby beaches were observed. In this study, the effect of seasonal variation, tide, and various coastal management including the beach filling were not considered. Because coastal erosion is greatly affected by geographic factors, each local government must find its own solution. Continuous research and local data accumulation are required.

주제어

표/그림 (12)

그림 Fig. 1. Flowchart
그림 Fig. 2. Yangyang and Gangneung aerial photos (1940's-1950's)
그림 Fig. 3. Gangneung aerial photos (1980-2005)
그림 Fig. 4. Ground control points on the CORONA image (Okgye, Gangneung)
그림 Fig. 5. CORONA mosaic image
그림 Fig. 6. Time series image (Okgye, Gangneung)
표 Table 1. CORONA KH-4B specifications
표 Table 2. CORONA image metadata
그림 Fig. 7. Edge detection result
그림 Fig. 8. Time series coastlines (Okgye, Gangneung)
그림 Fig. 9. Changes in coastline (Okgye, Gangneung)
그림 Fig. 10. Changes in coastline (Namdaecheon estuary, Yangyang)

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