GEO DATA

Euihyun Kim

2 Articles

Archive and distribution of VIIRS DNB data for the Northeast Asian Sea: Euihyun Kim, Joo-Hyung Ryu, Suk Yoon; GEO DATA. 2021;3(1):12-17. Published online March 31, 2021; DOI: https://doi.org/10.22761/DJ2021.3.1.002

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Night-time satellite data were first collected from the U.S. Air Force in 1972 for military purposes. Since then, it has been useful to understand the human activities in the fields of society, economy, culture, and science, etc. In the perspective of oceanography, the night-time satellite data has been used for monitoring purposes such as detecting night-time fishing boats. The Korea Ocean Satellite Center (KOSC) of the Korea Institute of Ocean Science & Technology (KIOST) has been directly receiving the Suomi National Polar-orbiting Partnership (S-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) Day & Night Band (DNB) data since June 2016. It has been archived and distributed for about four years. In addition, the KOSC operates its own ground system, which pre-processing the data including the radiance transformation, conversion of coordinate system, terrain correction, and calibration of lunar irradiation effect for quality improvement. Currently, the contributed data is preprocessed within about an hour after the receiving, so it is evaluated the high efficiency and usefulness in terms of time. This has confirmed the feasibility of real-time information acquisition through the research in the field of night-time monitoring/observation missions in the Northeast Asian Sea and onshore disaster/accident monitoring. The KOSC is making efforts to utilize the distributed data in various research such as maritime domain awareness. From the second half of this year, the NOAA-20 data will be directly received and distributed as an additional night-time satellite data. In the future, it is expected that the more diverse data will be distributed through the research utilization and supports.

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Monitoring Maritime Ship Characteristics Using Satellite Remote Sensing Data from Different Sensors
Won-Kyung Baek, Euihyun Kim, Ho-Kun Jeon, Kwang-Jae Lee, Sang-Wan Kim, Yoon-Kyung Lee, Joo-Hyung Ryu
Ocean Science Journal.2024;[Epub] CrossRef

Red tide dataset in the waters around the Korean Peninsula: Jisun Shin, Euihyun Kim, Keunyong Kim, Joo-Hyung Ryu; GEO DATA. 2019;1(1):13-24. Published online December 30, 2019; DOI: https://doi.org/10.22761/DJ2019.01.01.003

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Abstract PDF: Red tide blooms are increasing worldwide. Since 1995, Margalefidium polykrikoides blooms have occurred frequently in the waters around the Korean Peninsula. These blooms generally appear first on the South Sea of Korea in summer. When they occur on a large scale, they extend to the East Sea of Korea and the West Sea of Korea, causing great damage to fisheries and marine ecosystems. Harmless red tide can also adversely affect the environment of the waters by causing oxygen depletion in waters when occurring at high density. Currently, the National Institute of Fisheries Science (NIFS) is providing the daily red tide report based on M. polykrikoides red tide species. This report contains red tide species, location, and cell abundance information, but is limited to use as cell abundance data based on exact location. In addition, the waters around the Korean peninsula have different characteristics, so that the optical characteristics and seawater environment are different for each water. In the East Sea in Aug. 2013, the West Sea in Aug. 2016, the South Sea in Aug. 2018, and the South Sea in Aug. and Sep. 2019, during red tide season, dataset were obtained for red tide cell abundance, spectrum, chlorophyll concentration, and suspended particulate matter concentration. Noctiluca scintillans species were observed in the field survey conducted in 2016, and M. polykrikoides was mainly found in the other field surveys. Location-based red tide cell abundance data and seawater environment information obtained during red tide occurrence will be useful data for the construction of red tide warning system to reduce damage due to red tide blooms.

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