The relationship between satellite rainfall and the gauge rainfall

Abstract

The relationship between the rainfall obtained from weather satellite of the Tropical Rainfall Measuring Mission (TRMM) and the recorded rainfall from Thai Meteorology Department (TMD) was investigated. The 3 hourly rainfall data during 2009-2011 over the study area of the Nan River Basin were used in this study. The TRMM rainfall is higher than 3- hourly areal rainfall over the study area. More than 48% of 3-hourly rainfall pair occurrences are in the range of 0-5 mm. The obtained Probability of Detection (POD) score is more than 58%. The comparison of the TRMM rainfalls and the gauging rainfalls was undertaken using the linear regression technique. The comparison result was quite satisfactory with R2 of 0.557.