Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern China
Satellite-based precipitation products (SBPPs) are essential for rainfall quantification in areas where ground-based observation is scarce. However, the accuracy of SBPPs is greatly influenced by complex topography. This study evaluates the performance of Integrated Multi-satellite Retrievals for GP...
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MDPI AG
2023-01-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/2/473 |
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| author | Xuan Tang Hongxia Li Guanghua Qin Yuanyuan Huang Yongliang Qi |
| author_facet | Xuan Tang Hongxia Li Guanghua Qin Yuanyuan Huang Yongliang Qi |
| author_sort | Xuan Tang |
| collection | DOAJ |
| description | Satellite-based precipitation products (SBPPs) are essential for rainfall quantification in areas where ground-based observation is scarce. However, the accuracy of SBPPs is greatly influenced by complex topography. This study evaluates the performance of Integrated Multi-satellite Retrievals for GPM (IMERG) and Global Satellite Mapping of Precipitation (GSMaP) in characterizing rainfall in a mountainous catchment of southwestern China, with an emphasis on the effect of three topographic variables (elevation, slope, aspect). The SBPPs are evaluated by comparing rain gauge observations at eight ground stations from May to October in 2014–2018. Results show that IMERG and GSMaP have good rainfall detection capability for the entire region, with POD = 0.75 and 0.93, respectively. In addition, IMERG overestimates rainfall (BIAS = −48.8%), while GSMaP is consistent with gauge rainfall (BIAS = −0.4%). Comprehensive analysis shows that IMERG and GSMaP are more impacted by elevation, and then slope, whereas aspect has little impact. The independent evaluations suggest that variability of elevation and slope negatively correlate with the accuracy of SBPPs. The accuracy of GSMaP presents weaker dependence on topography than that of IMERG in the study area. Our findings demonstrate the applicability of IMERG and GSMaP in mountainous catchments of Southwest China. We confirm that complex topography impacts the performance of SBPPs, especially for complex topography in mountainous areas. It is suggested that taking topographical factors into account is needed for hydrometeorological applications such as flood forecasting, and SBPP evaluations and retrieval technology require further improvement in the future for better applications. |
| first_indexed | 2024-03-09T11:19:54Z |
| format | Article |
| id | doaj.art-195f2a453110453d87e22fe4727e0403 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-09T11:19:54Z |
| publishDate | 2023-01-01 |
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| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-195f2a453110453d87e22fe4727e04032023-12-01T00:21:27ZengMDPI AGRemote Sensing2072-42922023-01-0115247310.3390/rs15020473Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern ChinaXuan Tang0Hongxia Li1Guanghua Qin2Yuanyuan Huang3Yongliang Qi4State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaSatellite-based precipitation products (SBPPs) are essential for rainfall quantification in areas where ground-based observation is scarce. However, the accuracy of SBPPs is greatly influenced by complex topography. This study evaluates the performance of Integrated Multi-satellite Retrievals for GPM (IMERG) and Global Satellite Mapping of Precipitation (GSMaP) in characterizing rainfall in a mountainous catchment of southwestern China, with an emphasis on the effect of three topographic variables (elevation, slope, aspect). The SBPPs are evaluated by comparing rain gauge observations at eight ground stations from May to October in 2014–2018. Results show that IMERG and GSMaP have good rainfall detection capability for the entire region, with POD = 0.75 and 0.93, respectively. In addition, IMERG overestimates rainfall (BIAS = −48.8%), while GSMaP is consistent with gauge rainfall (BIAS = −0.4%). Comprehensive analysis shows that IMERG and GSMaP are more impacted by elevation, and then slope, whereas aspect has little impact. The independent evaluations suggest that variability of elevation and slope negatively correlate with the accuracy of SBPPs. The accuracy of GSMaP presents weaker dependence on topography than that of IMERG in the study area. Our findings demonstrate the applicability of IMERG and GSMaP in mountainous catchments of Southwest China. We confirm that complex topography impacts the performance of SBPPs, especially for complex topography in mountainous areas. It is suggested that taking topographical factors into account is needed for hydrometeorological applications such as flood forecasting, and SBPP evaluations and retrieval technology require further improvement in the future for better applications.https://www.mdpi.com/2072-4292/15/2/473IMERGGSMaPtopography factorsmountainous regions |
| spellingShingle | Xuan Tang Hongxia Li Guanghua Qin Yuanyuan Huang Yongliang Qi Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern China Remote Sensing IMERG GSMaP topography factors mountainous regions |
| title | Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern China |
| title_full | Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern China |
| title_fullStr | Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern China |
| title_full_unstemmed | Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern China |
| title_short | Evaluation of Satellite-Based Precipitation Products over Complex Topography in Mountainous Southwestern China |
| title_sort | evaluation of satellite based precipitation products over complex topography in mountainous southwestern china |
| topic | IMERG GSMaP topography factors mountainous regions |
| url | https://www.mdpi.com/2072-4292/15/2/473 |
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