Comparison of TRMM satellite rainfall and APHRODITE for drought analysis in the Pemali-Comal River Basin

摘要

Drought analysis needs continuous long time-series of monthly rainfall. Standardized Precipitation Index (SPI) and Standardized Runoff Index (SRI) which determine meteorological and hydrological drought index respectively are computed with the input data from TRMM 3B42RT and APHRODITE. The results are compared to the ground station data, in order to determine which data has good performance to describe drought condition in Pemali-Comal river basin. The meteorological drought index computed from TRMM gives better result than APHRODITE for SPI of 3 to 12 months, except for SPI 1 month. Nevertheless, the hydrological drought index from TRMM generally has better result than APHRODITE.