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GIF Animation:

We offer hourly global rainfall maps in near real time (about four hours after observation) using the combined MW-IR algorithm with TRMM TMI, Aqua AMSR-E, GCOM-W1 AMSR2, DMSP SSM/I and SSMIS, NOAA-19 AMSU, MetOp-A AMSU and GEO IR data. Background cloud images are globally merged IR data produced by NOAA Climate Prediction Center (CPC), using IR data observed by JMA's MTSAT satellite, NOAA's GOES satellites and EUMETSAT's Meteosat satellites.

User Registartion for Near-Real-Time Data

Near-real-time products and images will be removed when reanalysis version data is uploaded. Reanalysis version data (GSMaP_MVK Ver.5.222) is processed by the latest algorithm and uses all available satellite data. We release reanalysis data from Mar. 2000 to Nov. 2010 to registered users of near-real-time data.

  • User Registration

Joint research with other organizations

Currently, JAXA conducts joint researches with following organizations to develop and improve the GSMaP algorithms.

Validation of the GSMaP product at each region are included in intercomparison activities of satellite precipitation products, which is promoted by the International Precipitation Working Group (

What’s New

Your connection may fail briefly for maintenance during the following period.
Period: 08:00(JST), Sep. 28 to 18:00(JST)
Due to the network maintenance, our Web,FTP service will be temporarily unavailable during the following times.
Times: Sep. 3, 2013, 10:30, 14:30(JST)
Due to the network maintenance, your connection may be closed during the following period.
Period: Jul. 20-21, 2013.
Due to the network maintenance, your connection may be closed during the following period.
Period: Jul. 13-14, 2013.
We have completely renewed the WEB site "JAXA Global Rainfall Watch". In addition to the mode in which to display the global data up to now, also now available in overlay mode to display Google Map.
AMSR2/GCOM-W1 and DMSP-F18/SSMIS data have been introduced to GSMaP_NRT system since 00UTC 1 July 2013.
We made the GSMaP logo. It released on the GPM HP.


Rainfall rate (mm/hr)
Global (60N - 60S)
Grid resolution
0.1 degree lat/lon
Temporal resolution
1 hour

Instruction for Users

For more details about this web site and GSMaP, please read Users Guide.

  • Readme