Fig. 4

Landslides caused by the July 2017 Heavy Rain in Northern Kyushu (site F) as detected by the empirical approach (a) and the supervised classification using PolSAR, InSAR and DEM features (b–d), compared with the reference data by GSI (2017) (e). b Used the training data from the same site, c used the training data from the other site, d used only single-polarization (HH) data