Meteorological disasters/Rainfall/Slope disasters. Slope disasters/Landslides, debris flows.
Disaster name
June 29, 1999, One of the Frequent Debris Flow Disasters to Occur in the Northwest Area Around Hiroshima City
Author of WEB conversion
Higashi Toshio

Case Study

No. 19

1. Analysis objective

Sample some of the damage areas from the multiple debris flows that occurred simultaneously over a wide area.

2. Analysis procedure Analysis flow chart

1) Superimposed processing of disaster "before" and "after" data

2) Create synthesized image

3) Visually interpret image

3. Analysis results

We sampled the locations where ground cover conditions were changed by using two SPOT/PAN data observed before and after the debris flow disasters.

We were able to easily make visual interpretations using a composite image created by coloring the post-disaster data in red and the pre-disaster data in green, on which we superimposed newly-generated disaster areas in reddish-purple.

4. Results from using the analysis results

Creating drawings immediately after a disaster that show the locations of disaster areas stretching over large areas is extremely useful when drafting a disaster recovery measures plan.

Identifying the position of disaster areas in the mountains becomes easy by superimposing and displaying geographic information such as municipal districts, forest districts and river and stream channels.

Use by government administrators

5. Sources

Higashi T.: Selection and Use of Mountain Disaster Information From Satellite Data; An Example of Forest Disaster Satellite Data Analysis, Satellite Remote Sensing Promotion Committee, Forestry Industry WG: pp. 3-5, 2000