VALIDATION OF ESTIMATED TRMM RAINFALL DATA BY RAIN GAUGES IN IRAN

摘要

Estimation of rainfall by satellite technology is one of valuable data production. These data need to verify for more consistent with observed data. Tropical Rainfall Measuring Mission (TRMM) precipitation products have been extensively validated at ground sites around the world. Rain Gauge data from network of 3556 stations of I.R of Iran m eteorological organization (IRIMO) have been used to assess Tropical Rainfall Measuring Mission (TRMM) products for 2005. In this paper, scatter gram s, error reported between the Rain gauge analysis and 3b43 TRMM product from January to August and for the winter and spring seasons have been assessed in Iran. Errors statistics also have been calcula ted. This study dem onstrates that TRMM-m erged rainfall products show valuable agreement with gauge data over Iran on monthly-to-seasonal timescales. The root-mean-square error is about 0.9 mm day~(-1) at seasonal resolution and 1.2 mm day~(-1) at monthly resolution for merged TRMM data.