Geoinformatics Unit

Preliminary Landslide Mapping Following the Torrential Rain in Western Japan on July 6, 2018

July 19, 2018

On July 6, 2018, severe damage and causalities occurred due to the torrential rain in western Japan. The Geoinformatics Unit from RIKEN-AIP and the International Research Institute of Disaster Science (IRIDeS) conducted a preliminary damage mapping using satellite remote sensing imagery (ALOS-2) acquired from the affected areas. The ALOS-2 data used in this analysis was provided by the large-scale disaster satellite image analysis support team of the National Aerospace Exploration Agency of Japan.

To detect the areas where landslides occurred, we carried out a change detection analysis using a pre-event SAR data acquired on May 19, 2015, and post-event SAR data obtained two days after the heavy rain, on July 8, 2018. The image below shows detected landslide (yellow segments) in the surrounding areas of Higashi-Hiroshima city.

More details:
Web mapping LINK
Analysis report LINK


Detected landslide (yellow segments) in Higashi-Hiroshima.