| Summary: | MTSAT-1R navigation and calibration status has been studied by reviewing three and a half months HRIT imagery data from 28 June 2005. Infrared HRIT image location has been diagnosed by landmark matching evaluation. The latest evaluation shows that the image location error is within a pixel by standard deviation. The observed images have been compared to GOES-9 simultaneous observations to evaluate the calibration of the MTSAT-1R infrared channels. The result shows that MTSAT-1R IR1, IR2, and IR3 are well calibrated and no particular systematic error is found. The calibration of the MTSAT-1R visible channel has been also studied. It is possible that the trend monitor of the MTSAT-1R visible channel may indicate a sign of a slow transient change in the range of albedo larger than 0.11 until August 2005. From September, the trend of MTSAT-1R cooresponds to that of GOES-9, and no clear change is recognized. MSC started on 14 July to generate hourly AMVs for the NWP use and the satellite cloud information chart over the southern hemisphere for the aviation service. The NOAA data processing is switched from NOAA-16 to NOAA-18 in September. Clear sky radiance data and Antarctic NOAA HRPT data are being developed in MSC. 1
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