ABSTRACT

This study evaluates four satellite-based precipitation datasets with gauged rainfall observations at a daily and wet season time scales. Satellite Precipitation Estimators from Climate Hazards Group Infrared Precipitation Stations (CHIRPSv2), the Climate prediction center (CPC) morphing technique (CMORPH), the Integrated Multi-satellite Retrieval for GPM (IMERG-06) and Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks Cloud Classification System (PERSSIANN-CCS) were used. Categorical and continuous statistical techniques were applied to evaluate the detection and estimation ability of SPEs. Among the SPEs, CMORPH was superior, 0.90 and followed by IMERG-06, 0.82 in the Probability of detection (POD), Critical success index (CSI), 0.74 and 0.70 and Accuracy, 0.75 and 0.72 at wet season, respectively. The result of bias ratio showed underestimation for all SPEs at wet season and daily time scale. The comparison of SPEs in terms of RMSE indicated that IMERG-06 was better, 75.9 followed by CMORPH, 86.0. In terms of Relative bias (RBias), IMERG-06 was the second next to CHIRPSv2. On the other hand, IMERG-06 had better RMSE at JJAS and daily time scale. Overall, the findings of this evaluation study showed the capacity of IMERG-06 product could be reliable rainfall data sources for climate and hydrological analysis of central highlands of Abbay Basin.

摘要

本研究评估了四个基于卫星的降水数据集，并在每日和雨季时间尺度上测量了降雨量观测结果。气候灾害组织红外降水站卫星降水估算器 (CHIRPSv2)、气候预测中心 (CPC) 变形技术 (CMORPH)、GPM 综合多卫星检索 (IMERG-06) 以及使用人工神经网络的遥感信息降水估算使用网络云分类系统（PERSSIANN-CCS）。应用分类和连续统计技术来评估 SPE 的检测和估计能力。在 SPE 中，湿季的检测概率 (POD)、关键成功指数 (CSI)、准确度分别为 0.74 和 0.70，CMORPH 优于 0.90，其次是 IMERG-06，0.82，分别为 0.75 和 0.72。偏倚比的结果显示，在雨季和每日时间尺度上，所有 SPE 均被低估。SPE 的 RMSE 比较表明，IMERG-06 更好，为 75.9，其次是 CMORPH，86.0。就相对偏差 (RBias) 而言，IMERG-06 仅次于 CHIRPSv2。另一方面，IMERG-06 在 JJAS 和每日时间尺度上具有更好的 RMSE。总体而言，本次评估研究的结果表明，IMERG-06 产品的能力可以成为阿拜盆地中部高地气候和水文分析的可靠降雨数据源。IMERG-06 在 JJAS 和每日时间尺度上具有更好的 RMSE。总体而言，本次评估研究的结果表明，IMERG-06 产品的能力可以成为阿拜盆地中部高地气候和水文分析的可靠降雨数据源。IMERG-06 在 JJAS 和每日时间尺度上具有更好的 RMSE。总体而言，本次评估研究的结果表明，IMERG-06 产品的能力可以成为阿拜盆地中部高地气候和水文分析的可靠降雨数据源。