Snow depth map

1. Explanation of Snow Depth Maps

In Japan, many organizations have been making systematic in situ observations of daily, fresh snow depth and overall snow depth throughout the country, for a long time. Along with the innovation of information and communication technology, near real-time data have been collected and used for various purposes, such as monitoring of weather and climate, water resource management, and road snow removal. These observational data have been obtained from approximately 2,200 stations and are available on their websites. The Research Institute for Natural Hazards and Disaster Recovery (NHDR) has developed the “Quasi-Real-Time Snow Depth Monitoring System” and started automatic collection of real-time snow depth data from all over Japan in December 2015. The latest information of snow depth maps using the observational data is provided in their website. Users can also access previous maps and check the daily changes by specifying a certain date.

Daily Snow:
The snow depth map shows the interpolated snow depth in a 1 × 1 km grid, based on in situ measurement, for hourly data. The snow depth map is calculated using 9am data and is generally updated at about 10am.

24-hour Change:
The 24-hour Change map shows the difference in snow depth between the current day and the previous day.

2. Explanatory Notes:

The latest information of the snow depth maps is generally published at about 10 am, but the map may still be corrected even after that time if there is a delay in the delivery of real-time observational data. We recommend regularly refreshing the page to keep it updated.

Since the majority of the stations that capture the data are located on the coast of the Japan Sea and at low or intermediate altitudes, the accuracy of the snow depth map decreases in areas with few monitoring station, such as the Pacific coastal area in the west of the Kanto region and mountainous areas altitudes above 1,000 m.

3. Contacts

1) Research Institute for Natural Hazards and Disaster Recovery, Niigata University
Ikarashi-Ninocho 8050, Nishi-ku, Niigata, Japan
E-mail: kawasima (at)

2) Graduate School of Engineering, Kyoto University
Kyoto daigaku-katsura, Nishikyo-ku, Kyoto, Japan
E-mail: iyotsuto (at)


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