Disaster monitoring initiative in Japan by the earth observation of multi satellite-series constellation.

Our research institute has been promoting the national disaster monitoring and recovery support projects funded by Japanese government. Final goal of these projects is to establish the resilient social system in both before and after phase of national hazards. In this project, integrated system called "One stop system for disaster management" is under development, which enables us the optimum target observation and disaster situation assessment. With the rapid development of the small satellite industry, the use of remote sensing is dramatically changing in disaster monitoring. One of the key concepts is satellite constellation within or beyond single satellite series. Among this aspect, Japanese flagship satellite, ALOS-2 and -4, and small satellites from Japanese companies, are working together for effective observations under "One stop system". The effectiveness of this cooperative observation was evaluated in natural disasters caused by the Noto Peninsula earthquake (Jan. 2024), and other typical large-scale flooding in 2024. This paper summarizes the past research results and discusses future developments.