Provisional Inundation Depth Map in the Heavy Rain Event in July 2018 －Estimation of Inundation Area and Depth during Disaster Using Social Media and DEM－

Abstract

A heavy rain accompanied by a front hit western Japan in July 2018, flooded the Takahashi River system and the Hijikawa River, and brought an inundation disaster nearby. Geospatial Information Authority of Japan (GSI) created and released provisional inundation depth maps by deciphering and analyzing the inundation area and depth using social media, aerial photographs, and DEM.