Geographic Information Analysis Research Div.

Topics

• Presented at the 2025 session of the United Nations Group of Experts on Geographical Names(28 April to 2 May @UN, NY)
  • Akira SASAGAWA:Introduction to Standardization of Kanji in relation to the Notation of Geographical Names.
• Presented at the IAG Webinar East & Southeast Asia 2025(7 March@Online)(Invited)
  • Junko IWAHASHI:Statistical analysis of depth to bedrock and terrain attributes using DEMs in Japan.
• Presented at the 14th Joint Meeting of the UJNR Panel on Earthquake Research(25-27 September 2024@Odawara, Japan).
  • Akira SASAGAWA:Trial of automatic change detection method using Haar Wavelet among two Sentinel-2 images for the 2024 Noto Peninsula earthquake.
  • Ryo ENDO, Junko IWAHASHI and Kazuki YOSHIDA: Seismic Ground Disaster Assessment System (SGDAS) and its estimation results for the 2024 Noto Earthquake.
• Presented at the 8th International Conference on Earthquake Geotechnical Engineering(7-10 May 2024@Osaka, Japan).
  • Junko IWAHASHI, Ryo ENDO, Takayuki NAKANO:Seismic Ground Disaster Assessment System (SGDAS) of GSI and its scope.
• 2nd International Conference on Construction Resources for Environmentally Sustainable Technologies (20-22 November 2023@Fukuoka, Japan).
  • Ryo ENDO, Junko IWAHSHI: Estimation of effect of antecedent rainfall on coseismic landslides

• 2023 session of the United Nations Group of Experts on Geographical Names (1-5 May 2023@United Nations in NY).
  • Akira Sasagawa:Standardization of Geographical Names in Japan.
  • Akira Sasagawa:International Symposium on the Standardization of Geographical Names - Introducing the Efforts and Contributions by UNGEGN and Japan.

Data Download

• Topographic maps of the moon
• Image Enhancement Program for Advanced Land Observing Satellite (ALOS)
• Automated terrain classification map using SRTM30
• Automated terrain classification map using MERIT DEM(280m)
• Workshop with Minecraft
• Classification of Topography using 30 m DEM of Japan
• GIS dataset for global terrain classification using MERIT DEM(90m)
• Depth to bedrock in Japan with terrain attributes

Researchers (FY 2025)

• SASAGAWA, Akira : Head of Division
• IWAHASHI, Junko : Chief Researcher
• YOSHIDA, Kazuki : Researcher
• ENDO,Ryo: Researcher

Research Projects (FY 2025)

• Research on Improvement of Estimation Accuracy of "Seismic Ground Disaster Assessment System (SGDAS)" (FY2021-2025)
• Research on methods for generating and using historical topographic data (FY2023-2025)

Paper in English

• Junko IWAHASHI: Depth to bedrock in Japan: insights from borehole data and terrain analysis using digital elevation models. Prog Earth Planet Sci 12, 23. DOI: 10.1186/s40645-025-00698-3

• Kazuki YOSHIDA, Mamoru KOARAI: A simple method to automatically remove artificial terrain from airborne LiDAR DTMs in plain areas. Geomorphology 465, 109388. DOI:10.1016/j.geomorph.2024.109388
• Kazuki YOSHIDA, Ryo ENDO, Junko IWAHASHI, Akira SASAGAWA, Hiroshi YARAI: Aerial SfM–MVS Visualization of Surface Deformation along Folds during the 2024 Noto Peninsula Earthquake (Mw7.5). Remote Sensing 16(15), 2813. DOI:10.3390/rs16152813
• Junko IWAHASHI, Ryo ENDO:Seismic Ground Disaster Assessment System (SGDAS) of GSI Japan and its scope. 8th International Conference on Earthquake Geotechnical Engineering, Japanese Geotechnical Society Special Publication, 10(60), 2361-2366. DOI:10.3208/jgssp.v10.P2-02
• Ryo ENDO, Junko IWAHASHI:Estimation of Effect of Antecedent Rainfall on Coseismic Landslides. In: Hazarika, H., Haigh, S.K., Chaudhary, B., Murai, M., Manandhar, S. (eds) Natural Geo-Disasters and Resiliency. IC-CREST 2023. Lecture Notes in Civil Engineering, vol 445. Springer, Singapore. DOI:10.1007/978-981-99-9223-2_26
• Naoyuki YAMASHITA, Yasuhiro OHNUKI, Junko IWAHASHI, Akihiro IMAYA:National-scale mapping of soil-thickness probability in hilly and mountainous areas of Japan using legacy and modern soil survey. Geoderma, 446, 116896. DOI:10.1016/j.geoderma.2024.116896
• Ryo ENDO, Junko IWAHASHI:Analysis of the spatial distribution of landslides triggered by the 1923 Great Kanto Earthquake, Japan. Proceedings of the Japan Academy, Series B 100, 123-139.

• Iwahashi J, Yamazaki D (2022): Global polygons for terrain classification divided into uniform slopes and basins. Progress in Earth and Planetary Science, 9, 33. [full text]

• Yamashita N, Ishizuka S, Hashimoto S, Ugawa S, Nanko K, Osone Y, Iwahashi J, et al. (2022): National-scale 3D mapping of soil organic carbon in a Japanese forest considering microtopography and tephra deposition. Geoderma, 406, 115534. [full text]

• Iwahashi J., Yamazaki D., Nakano T., Endo R.(2021):Classification of topography for ground vulnerability assessment of alluvial plains and mountains of Japan using 30 m DEM. Prog Earth Planet Sci 8, 3 [full text]