Abstract The goal of this study is to examine the capability of the TRMM 3B42 product to detect spatial and temporal patterns in extreme precipitation events over southwestern Iran during the period of 1998–2016. A ground-based gridded precipitation dataset was created using a dense network of surface observations for the evaluation process. Various extreme precipitation indices in the three categories of fixed threshold indices, grid-related threshold indices, and non-threshold indices were examined and compared with the ground-based gridded precipitation dataset. The findings suggest that the TRMM 3B42 product is able to capture the spatial and temporal behavior of many extreme indices especially for fixed and non-threshold indices. In terms of the spatial error metrics, the satellite product has better performance over mid-elevated areas in the south and southeastern parts of the study region.

中文翻译：

---

对用于伊朗西南部极端降水分析的 TRMM 3B42 产品的评估

摘要 本研究的目的是检验 TRMM 3B42 产品在 1998-2016 年期间检测伊朗西南部极端降水事件时空模式的能力。使用密集的地表观测网络为评估过程创建了一个基于地面的网格降水数据集。研究了固定阈值指数、网格相关阈值指数和非阈值指数三类中的各种极端降水指数，并与地基网格降水数据集进行了比较。研究结果表明，TRMM 3B42 产品能够捕捉许多极端指数的空间和时间行为，尤其是对于固定和非阈值指数。在空间误差度量方面，