1. 1) Ministry of Land, Infrastructure, Transport and Tourism : Overview of and response to the heavy rainfall in July 2020 (second report), http://www.qsr.mlit.go.jp/nobeoka/kasen/ryuikitisui/05%20shiryou1.pdf, 2020 (accessed 2021/03/22) (in Japanese).
2. 2) Ministry of Land, Infrastructure, Transport and Tourism : Hydrology and Water Quality Database, http://www1.river.go.jp, 2019 (accessed 2021/03/22) (in Japanese).
3. 3) Data Integration and Analysis System (DIAS) : http://www.diasjp.net/service/xrain/, 2020 (accessed 2021/03/22) (in Japanese).
4. 4) Geospatial Information Authority of Japan : Basic Geospatial Information, https://www.gsi.go.jp/kiban/index.html, 2020 (accessed 2021/03/22) (in Japanese).
5. 5) Japan Aerospace Exploration Agency (JAXA) : JAXA High Resolution Land-Use and Land-Cover Map, https://www.eorc.jaxa.jp/ALOS/jp/dataset/lulc_j.htm, 1997 (accessed 2021/03/22) (in Japanese).