GOCI로부터 해양 프론트를 추출하기 위한 형태학적 경사 기반 방법

Abstract

This study focused on extracting the fronts from ocean color data using the Geostationary Ocean Color Imager (GOCI), the world’s first geostationary ocean color sensor platform. GOCI can be a great solution to monitor subtle changes of the ocean condition because it observes an equivalent region (i.e. Northeast Asia) every hour eight times a day. The morphological gradient scheme that is a traditional edge detection algorithm is employed to successfully extract the ocean fronts. The ocean fronts derived from the total suspended sediment (TSS) data are used to confirm oceanic changes in the coastal region that has extremely high turbidities (e.g., west coasts of Korea). On the other hand, the ocean fronts derived from chlorophyll concentration (CHL) data are exploited to investigate oceanic changes in the offshore that has relatively low turbidities (e.g. East Sea of Korea). In the results deduced from the TSS fronts, statistics of semidiurnal changes for the tide in the coastal region were approximately measured, and we could find out that the extracted fronts are quite relevant to the topographical and physical characteristics of coastal region where tidal sand ridges are well evolved. In the results deduced from the CHL fronts for East Sea of Korea, dynamic variations (e.g. mushroom-shaped structures) and oceanic eddies (e.g. Ulleung Warm Eddies) were observed. ocean condition because it observes an equivalent region (i.e. Northeast Asia) every hour eight times a day. The morphological gradient scheme that is a traditional edge detection algorithm is employed to successfully extract the ocean fronts. The ocean fronts derived from the total suspended sediment (TSS) data are used to confirm oceanic changes in the coastal region that has extremely high turbidities (e.g., west coasts of Korea). On the other hand, the ocean fronts derived from chlorophyll concentration (CHL) data are exploited to investigate oceanic changes in the offshore that has relatively low turbidities (e.g. East Sea of Korea). In the results deduced from the TSS fronts, statistics of semidiurnal changes for the tide in the coastal region were approximately measured, and we could find out that the extracted fronts are quite relevant to the topographical and physical characteristics of coastal region where tidal sand ridges are well evolved. In the results deduced from the CHL fronts for East Sea of Korea, dynamic variations (e.g. mushroom-shaped structures) and oceanic eddies (e.g. Ulleung Warm Eddies) were observed.