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Global Flood Alert System II (GFAS‡U) ver.2.1 released
  July 6, 2017 / IFNet secretariat




IDI-Japan had been operating gGlobal Flood Alert System (GFAS)h on the website since April 2006 and started operations of GFAS‡U(ver.2.0) in June 2015 which additionally utilized GSMaP_NRT*, the precipitation obtained by analysis of observation data from multiple satellites.

GFAS‡U 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), conducts risk assessment by occurrence probability (return period) in each grid, and updates the data hourly in the map.

Japan Aerospace Exploration Agency (JAXA) started delivering GSMaP_NOW in 2015 which provides precipitation in almost real time. The new version of GFAS‡U(ver.2.1) utilizes the data of GSMaP_NOW and can show a global risk map of possible rain related disasters about 1 hour late.

The revised GFAS‡U(ver.2.1) is available in the following web sites since June 2017.

[for PCs] http://gfas.internationalfloodnetwork.org/n-gfas-web/pc/frmMain.aspx

[for Smartphones] http://gfas.internationalfloodnetwork.org/n-gfas-web/sp/frmMain.aspx

Major Improvements of GFAS‡U(ver.2.1)

✓Utilization of GSMaP_NOW

✓Updating probability of precipitation occurrence (probability distribution form):
For the precipitation in the past, data by the latest JAXA products, RNLver6 and MVKver6 are used as well as precipitation data of the recent 2 years and data of the past 16 years.

✓Extension of movie display time

✓Burmese now available:
You can choose from six languages; English, Spanish, German, Vietnamese, Burmese and Japanese.


GSMaP_NRT is the near real time version which provides global precipitation data about 4 hours late with high resolution (with temporal resolution; 1.hour and special resolution; latitude and longitude grid of 0.1 degree width)

GSMaP_NOW is the quasi-real time version of GSMaP_NRT which provides precipitation data within the observation range of Stationary Satellite HIMAWARI by predicting precipitation of 30 minutes later using cloud motion vector observed by HIMAWARI.


NOTE: In GFAS‡U, GSMaP_NRT shows data about 4 hours late, and GSMaP NOW shows about 1 hour late. GSMaP_NOW is higher in immediacy than GSMaP_NRT, however, tends to be lower in qualitative accuracy.

If you have any questions, please send an e-mail to the following e-mail address:
Infrastructure Development InstituteiIDI-Japanj
e-mail;info@internationalfloodnetwork.org



[Reference]
*GSMaP: http://sharaku.eorc.jaxa.jp/GSMaP/guide.html