Volume 28, Issue 1 (2024)
MJSP 2024, 28(1): 120-147 |
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Barkhordarifard Z, Shamsoddini A. The effect of ground elevation and temperature on the performance of satellite products of precipitation on a monthly scale in Iran. MJSP 2024; 28 (1) :120-147
URL: http://hsmsp.modares.ac.ir/article-21-75758-en.html
URL: http://hsmsp.modares.ac.ir/article-21-75758-en.html
1- Department of Remote Sensing & GIS, Faculty of Humanities, Tarbiat Modares University, Tehran, Iran
2- Department of Remote Sensing & GIS, Faculty of Humanities, Tarbiat Modares University, Tehran, Iran ,ali.shamsoddini@modares.ac.ir
2- Department of Remote Sensing & GIS, Faculty of Humanities, Tarbiat Modares University, Tehran, Iran ,
Abstract: (453 Views)
The estimation and measurement of precipitation in situ presents considerable challenges due to factors such as exorbitant costs, a scarcity of monitoring stations, point sampling limitations, and its lack of generalizability to broader surface areas. Consequently, it is imperative to evaluate the accuracy of satellite-derived precipitation products as viable alternatives to conventional field measurements. Given that precipitation is influenced by the climatic conditions and physiographic characteristics inherent to specific regions, this study aims to not only validate and verify satellite precipitation products but also to examine the impact of temperature and elevation on the efficacy of MERRA, TRMM, and CHIRPS satellite precipitation products over a monthly scale from 2005 to 2019, utilizing data from 222 synoptic stations located throughout Iran. The findings indicated that the root mean square error for the TRMM, MERRA, and CHIRPS satellites was recorded at 23.8 mm, 30.6 mm, and 35 mm respectively, suggesting a superior performance of the TRMM satellite in comparison to the other two products. Moreover, the results demonstrated that the TRMM satellite consistently outperformed the other two satellites across all temperature and elevation classifications. At elevations below 500 m and above 1500 m, as well as at temperatures less than 18 °C, MERRA exhibited superior performance relative to CHIRPS, offering more accurate estimations of actual precipitation. Overall, the results indicate that TRMM satellite products may serve as a reliable substitute for observational data, as this satellite not only demonstrates commendable performance in the assessment of satellite products but also excels across varying elevation and temperature conditions.
Article Type: Original Research |
Subject:
techniques if spatial / locational data processing in environmental planning
Received: 2024/06/22 | Accepted: 2024/10/2 | Published: 2024/03/20
Received: 2024/06/22 | Accepted: 2024/10/2 | Published: 2024/03/20
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