PURPOSES : The aim of this study is to develop a road fog information system based on the geostationary meteorological satellite (GK2A) for road weather services on highways. METHODS : Three threshold values sensitive to fog intensity in the GK2A fog algorithm were optimized using multi-class receiver operating characteristic analysis to produce road fog information depending on day and night. The developed a GK2A road fog algorithm that can detect three levels of road fog based on the visibility distance criteria (1km, 500m, and 200m). Furthermore, the GK2A road fog product was not only substituted with visibility objective analysis data in unknown and cloud-covered areas of satellite data, but also integrated with visibility distance data obtained from visibility gauges and CCTV image analysis to improve the accuracy of road fog information. RESULTS : The developed road fog algorithm based on meteorological satellite data provides real-time road fog information categorized into three levels (attention, caution, and danger) based on the visibility distance, with a spatial resolution of 1km × 1km and temporal resolution of 5 minutes. The road fog algorithm successfully detected road fog in five out of seven fog-related traffic accidents reported by Korean media outlets from 2020 to 2022, resulting in a detection success rate of 71.4%. The Korea Meteorological Administration is currently in the process of installing additional visibility gauges on 26 highways until 2025, and the next high-resolution meteorological satellite (GK5) is planned to be launched in 2031. We look forward to significantly improving the accuracy of the road fog hazard information service in the near future. CONCLUSIONS : The road fog information test service was initiated on the middle inner highway on July 27, 2023, and this service is accessible to all T-map and Kakao-map users through car navigation systems free of charge. After 2025, all drivers on the 26 Korean highways will have access to real-time road fog information services through their navigation systems.

1. 서론
    1.1. 논문개요
2. 연구배경 및 목적
    2.1. 연구배경
    2.2. 연구목적
3. 방법론
    3.1. 천리안위성 2A호 도로 안개 알고리즘 개발
    3.2. 다양한 안개 자료의 합성
4. 연구결과
    4.1. 천리안위성 2A호 도로 안개 산출물 정량평가
    4.2. 안개 자료의 특성과 최종 도로 가시거리 위험정보의 제공
5. 결론
REFERENCES

• 임한철(기상청 국가기상위성센터 위성기획과 연구사) | Lim Hancheol Corresponding author
• 김현수(기상청 국가기상위성센터 위성기획과 연구원) | Kim HyeonSu
• 이명희(기상청 국가기상위성센터 위성기획과 과장) | Lee Myoung-Hee