| In this paper, a proposal is made to apply corrections to satellite rainfall data so that they can be used effectively. Rainfall is the basic information that is needed for flood forecasting, and in many developing countries, measurements are not often carried out in a systematic way. Satellite-based rainfall data has the advantage that they can be obtained world-wide in near real-time. Therefore, satellite-based rainfall information has the potential to be utilized for flood forecasting and warning in developing countries.The satellite-based rainfall product used in this study is GSMaP(JAXA). The characteristics of these products were studied in the Yoshino river basin in Japan. They were compared with the ground observed rainfall data, and it was found that the products underestimated the ground observed data. In this study, “the movement of rainfall area of satellite-based rainfall product” is studied and regarded as one of its characteristics. If the movement of rainfall area can be evaluated, it is possible to establish a correction method to reduce the error margin with ground observation data. “The movement of rainfall area of satellite-based rainfall product” is expressed from a time change in the mapping pattern of satellite-based rainfall product. As a result, the error margin rate has improved from 68% to 21%. The detailed results will be described in the full paper. |
