Application of GMS-5 data in estimation of rainfall distribution

Abstract

The process of converting GMS-WEFAX imagery into binary data to calculate surface and cyclonic rain in and around Bangladesh was presented in this study. Satellite rainfall was calculated from GMS-5 data for the months of June-July 1996 using GMS Precipitation Index (GPI) and Convective Stratiform Technique (CST). The rainfall calculated by GPI and CST was calibrated with that of calculated by rain gauge. On an average for June-July 1996, daily rainfall calculated by rain gauge, CST and GPI was 14 mm, 14.5 mm and 27.5 mm respectively. The regression equation was obtained for both GPI and CST analyses to calculate surface rain from satellite data. The CST method was found better than the GPI method in calculating surface rain. Then cyclonic rain was obtained using CST method on the event of a Cyclone occurred 27-30 October 1999 over the Bay of Bengal.