نوع مقاله : مقاله علمی پژوهشی
نویسندگان
1 دانشجوی دکتری آب و هواشناسی، گروه جغرافیای طبیعی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 استاد آب و هواشناسی، گروه جغرافیای طبیعی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران
3 استاد ژئومورفولوژی، گروه جغرافیای طبیعی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Precipitation is one of the most complex and critical elements of Earth's atmosphere. Its temporal and spatial variations can control the environmental characteristics of any geographical region. Consequently, many climatologists regard precipitation as the most important atmospheric phenomenon and one of the principal climatic elements. Continuous advancement in remote sensing technology has led to the development of numerous satellite precipitation products aimed at providing continuous global precipitation data at various temporal and spatial scales, and the expansion of satellites and satellite precipitation algorithms has provided new potential for precipitation estimation. However, the use of these satellite data requires comprehensive evaluation of their accuracy and efficiency. Therefore, the objective of this study is to examine and evaluate the accuracy of PERSIANN-CDR and CHIRPS satellite precipitation data at the daily scale in the western half of Iran. To this end, PERSIANN-CDR and CHIRPS satellite precipitation data and daily precipitation data from 24 synoptic stations during the statistical period (2001-2023) were utilized. To assess the accuracy of PERSIANN-CDR and CHIRPS satellite precipitation data, statistical indices including CC, RMSE, MAE, and PBias, as well as three categorical indices POD, FAR, and CSI were employed. The results indicated that absolute preference cannot be established for either of these two satellite datasets. Overall, the results obtained from the mean values of CC, MAE, PBias, and FAR indices suggest the relative superiority of CHIRPS over PERSIANN-CDR. In contrast, PERSIANN-CDR precipitation data demonstrate superiority in RMSE, POD, and CSI indices. Therefore, the selection of the desired satellite data should be based on the index of interest. Finally, the average results of the evaluation indices indicate the relative superiority of CHIRPS over PERSIANN-CDR.
کلیدواژهها [English]