## 3 Methods
\begin{table}
\begin{tabular}{c c c c c} \hline
**Name** & **Source** & **Data Description** & **Time** & **Purpose** \\ \hline \multirow{4}{*}{AHI data} & Japan Aerospace Exploration Agency & \multirow{2}{*}{Remote sensing images} & \multirow{2}{*}{2015–2020} & Sea fog identification and calculating the frequency \\  & (accessed on 1 July 2021) & & & of monthly sea fog \\  & National Aeronautics and Space & \multirow{2}{*}{Classified data of clouds} & \multirow{2}{*}{2018} & \multirow{2}{*}{2018} & Sea fog samples and verifying the accuracy \\  & Administrist & & & \\ \multirow{4}{*}{CALIPSO-VFM} & ([[https://search.earthdata.nasa.gov/search](https://search.earthdata.nasa.gov/search)]([https://search.earthdata.nasa.gov/search](https://search.earthdata.nasa.gov/search)) & \multirow{2}{*}{2018} & \multirow{2}{*}{2018} & \multirow{2}{*}{2018} \\  & (accessed on 7 July 2021 ) & & product [27] & \\  & European Centre for Medium-Range & \multirow{2}{*}{10 m wind reanalysis data} & \multirow{2}{*}{2015–2020} & \multirow{2}{*}{Calculating the frequency \\ Wind} & Weather Forecasts & & & \\  & ([[https://www.ecmw.int/](https://www.ecmw.int/)]([https://www.ecmw.int/](https://www.ecmw.int/)) & \multirow{2}{*}{from ERA5 [28]} & \multirow{2}{*}{2015–2020} & \multirow{2}{*}{Calculating the frequency \\  & (accessed on 15 June 2021)) & & & of strong wind \\  & European Centre for Medium-Range & \multirow{2}{*}{Significant Wave Height} & \multirow{2}{*}{2015–2020} & \multirow{2}{*}{Calculating the frequency \\ Sea wave & ([[https://www.ecmw.int/](https://www.ecmw.int/)]([https://www.ecmw.int/](https://www.ecmw.int/)) & \multirow{2}{*}{ERA5 [28]} & \multirow{2}{*}{2015–2020} & \multirow{2}{*}{Calculating the frequency \\  & (accessed on 15 June 2021)) & & & of big waves \\  & National oceanic and atmospheric & \multirow{2}{*}{Analyses currents data} & \multirow{2}{*}{2016–2020} & \multirow{2}{*}{Calculating the frequency \\ Ocean currents & ([[https://www.ncei.noaa.gov/](https://www.ncei.noaa.gov/)]([https://www.ncei.noaa.gov/](https://www.ncei.noaa.gov/)) & \multirow{2}{*}{from HYCOM [29]} & \multirow{2}{*}{2016–2020} & \multirow{2}{*}{Calculating the frequency \\ Water depth & & & & \\  & (accessed on 16 June 2021)) & & Global terrain model from & of big currents \\  & & & & \\  & Martime Safety Administration of the & \multirow{2}{*}{Global terrain model from } & \multirow{2}{*}{2019} & \multirow{2}{*}{Obtaining water \\ Accident data & people’s Republic of China & \multirow{2}{*}{GEBCO [30]} & \multirow{2}{*}{2019} & \multirow{2}{*}{depth data} \\  & ([[https://www.msa.gov.cn/](https://www.msa.gov.cn/)]([https://www.msa.gov.cn/](https://www.msa.gov.cn/)) & \multirow{2}{*}{Accident data collected} & \multirow{2}{*}{2015–2020} & \multirow{2}{*}{Weighting factors and validating the risk model} \\  & (accessed on 1 March 2021)) & & & \\  & Martime Safety Administration of the & \multirow{2}{*}{Optically recommended} & \multirow{2}{*}{2019} & \multirow{2}{*}{Subdivision shipping  route} \\ Shipping routes & people’s Republic of China & \multirow{2}{*}{2019} & \multirow{2}{*}{Subdivision shipping  route} \\  & (accessed on 1 March 2021)) & & & \\ \hline \end{tabular}
\end{table} 
Table 1: Data information.