For building resilience against water-related disasters



Global Flood Alert System (GFAS)II version 2.1 was released in June 2017 by IDI-Japan.
GFASII provides precipitation data observed by satellites using Global Grid (with latitude and longitude of 0.1 degree width which is approximately 11 km in equatorial regions. GFASII conducts risk assessment by occurrence probability (return period) in each grid and updates the data hourly to show a global risk map of possible rain-related disasters about 1 hour behind time.

GFASII uses the satellite data from Japan Aerospace Exploration Agency (JAXA).

GFAS For PCs and Smartphones

GFASII is available both for pcs and smartphones. Please click the GFASII banners in the right.


If you have any questions, please send an e-mail to the following address:

Infrastructure Development Institute(IDI-Japan)