Himawari-8, -9/AHI VIS/NIR Ray-matching with VIIRS

Graph condition
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Monthly statistics



Band1 (0.47 µm)
Band2 (0.51 µm)
Band3 (0.64 µm)
Band4 (0.86 µm)
Band5 (1.6 µm)
Band6 (2.3 µm)


Press the button to get the estimated calibration coefficients time series csv file (Please select VIIRS data before download).

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  • In the ray-matching technique, AHI (monitored data) and VIIRS (reference data) are displayed on Y- and X-axes, respectively, in regression. As these axes are opposite to those of the vicarious calibration approach, the increasing/decreasing trends seen with ray-matching are also opposite.
  • Daily trends determined from ray matching (indicated by the blue “x” marks in the time series) exhibit variability because the number of collocations varies considerably from day to day.
  • For the periods shown below, scatter plots are not shown and time-series graphs exhibit discontinuity. VIIRS data for this technique are downloaded from the NASA CLASS website daily, but data retrieval failure was also observed during these periods.
    * 9 Mar. - 4 Sep. 2017, 14 Sep. - 4 Oct. 2017, 12 Dec. 2017 - 9 Jan. 2018, 17 Jan. - 11 Feb. 2018
  • Himawari-9 results include data from in-orbit testing in Feb. 2017 and other non-operational observations (e.g., health-check operation) during the standby period.
  • For technical information on this calibration approach, see the Visible and Near-Infrared Calibration Guide for Ray-Matching.