Table 2 Thematic map data used for comparison with the terrain classification of the current study
Data no. | Range | Dataset, map | Creator/publisher | Subject | Map scale/resolution | Usage in this study |
|---|---|---|---|---|---|---|
1 | Nationwide | Seamless digital geological map of Japan (SDGM) | GSJ (ed.) (2015) GSJ (ed.) (2019) | Geology | 1:200,000 | Grouping decision, subdivision of the groups |
2 | Nationwide | Japan engineering geomorphologic classification map (JEGM) ver. 3 | Wakamatsu and Matsuoka (2013) | Landform | 250 m grid | Grouping decision, subdivision of the groups |
3 | Urban plains and their surroundings | GIS data of landform classification | GSI (maps are available on the GSI Maps (GSI 2020)) | Landform | Compilation of 1:25,000 Land Condition Map and Landform Classification Map for Flood Control | Comparison, subdivision of the groups |
4 | Nationwide | Landslide Distribution Maps | NIED (2015) | Major landslide (often deep-seated) | 1:50,000 | Grouping decision |
5 | 5 regions (total 98 km2)a | Inventory of landslides | Iwahashi et al. (2012) | Small or shallow landslides | Interpolated from 2 m LiDAR and 20–50 cm orthoimageries | Grouping decision |
6 | Iburi, Hokkaido (approximately 400 km2)b | Inventory of landslides | Yamagishi and Iwahashi (2020) | Shallow landslides | Interpolated from 1 and 2 m LiDAR and orthoimageries | Grouping decision |
7 | Western Japanc | Inventory of landslides | GSI (2016) GSI (2018) | Small or shallow landslides | Interpolated from aerial digital photographs | Grouping decision |
8 | Eastern Japand | Estimated inundation areas | GSI (2019) | Flood area | Estimated by aerial photographs and 5 m DEMs | Visual observation |