Accuracy analysis and evaluation of GPM and TRMM satellite daily precipitation data in Gansu Province

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Through the evaluation of the IMERG_Late run from the GPM satellite and the TMPA_3B42RT from the TRMM satellite at 22 stations in Gansu Province, it has been determined that the IMERG_Late run of the GPM satellite exhibits a higher level of consistency with measured precipitation data compared to the TMPA_3B42RT of the TRMM satellite, along with superior deviation performance. The IMERG_Late run demonstrates noticeable spatial variances and increasing trends in correlation coefficients, whereas the correlation coefficient of TMPA_3B42RT is relatively less pronounced. The agreement between the two satellite precipitation products remains steady across seasons and precipitation levels, with root mean square errors generally lower in the northwest region compared to the southeast. Furthermore, the Probability of Detection (POD) and Critical Success Index (CSI) of the IMERG_Late run generally surpass those of TMPA_3B42RT, with slightly lower POD values. Particularly under varying precipitation intensities, the IMERG_Late run outperforms TMPA_3B42RT significantly, especially within the 1~10mm/d range. Despite the occurrence of notable false alarms at specific stations for both products, these instances are predominantly concentrated in the northwest of the study area. In conclusion, the daily precipitation product of the IMERG_Late run demonstrates advantages in terms of accuracy and applicability when compared to TMPA_3B42RT.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.