Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda
Tropical Storm Imelda struck the southeast coastal regions of Texas from 17–19 September, 2019, and delivered precipitation above 500 mm over about 6000 km<sup>2</sup>. The performance of the three IMERG (Early-, Late-, and Final-run) GPM satellite-based precipitation products was evalua...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/12/6/687 |
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| author | Salman Sakib Dawit Ghebreyesus Hatim O. Sharif |
| author_facet | Salman Sakib Dawit Ghebreyesus Hatim O. Sharif |
| author_sort | Salman Sakib |
| collection | DOAJ |
| description | Tropical Storm Imelda struck the southeast coastal regions of Texas from 17–19 September, 2019, and delivered precipitation above 500 mm over about 6000 km<sup>2</sup>. The performance of the three IMERG (Early-, Late-, and Final-run) GPM satellite-based precipitation products was evaluated against Stage-IV radar precipitation estimates. Basic and probabilistic statistical metrics, such as CC, RSME, RBIAS, POD, FAR, CSI, and PSS were employed to assess the performance of the IMERG products. The products captured the event adequately, with a fairly high POD value of 0.9. The best product (Early-run) showed an average correlation coefficient of 0.60. The algorithm used to produce the Final-run improved the quality of the data by removing systematic errors that occurred in the near-real-time products. Less than 5 mm RMSE error was experienced in over three-quarters (ranging from 73% to 76%) of the area by all three IMERG products in estimating the Tropical Storm Imelda. The Early-run product showed a much better RBIAS relatively to the Final-run product. The overall performance was poor, as areas with an acceptable range of RBIAS (i.e., between −10% and 10%) in all the three IMERG products were only 16% to 17% of the total area. Overall, the Early-run product was found to be better than Late- and Final-run. |
| first_indexed | 2024-03-10T10:58:33Z |
| format | Article |
| id | doaj.art-6b404cdd3b9f42178f9a09b4a396d53a |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T10:58:33Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-6b404cdd3b9f42178f9a09b4a396d53a2023-11-21T21:41:36ZengMDPI AGAtmosphere2073-44332021-05-0112668710.3390/atmos12060687Performance Evaluation of IMERG GPM Products during Tropical Storm ImeldaSalman Sakib0Dawit Ghebreyesus1Hatim O. Sharif2Department of Civil & Environmental Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USADepartment of Civil & Environmental Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USADepartment of Civil & Environmental Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USATropical Storm Imelda struck the southeast coastal regions of Texas from 17–19 September, 2019, and delivered precipitation above 500 mm over about 6000 km<sup>2</sup>. The performance of the three IMERG (Early-, Late-, and Final-run) GPM satellite-based precipitation products was evaluated against Stage-IV radar precipitation estimates. Basic and probabilistic statistical metrics, such as CC, RSME, RBIAS, POD, FAR, CSI, and PSS were employed to assess the performance of the IMERG products. The products captured the event adequately, with a fairly high POD value of 0.9. The best product (Early-run) showed an average correlation coefficient of 0.60. The algorithm used to produce the Final-run improved the quality of the data by removing systematic errors that occurred in the near-real-time products. Less than 5 mm RMSE error was experienced in over three-quarters (ranging from 73% to 76%) of the area by all three IMERG products in estimating the Tropical Storm Imelda. The Early-run product showed a much better RBIAS relatively to the Final-run product. The overall performance was poor, as areas with an acceptable range of RBIAS (i.e., between −10% and 10%) in all the three IMERG products were only 16% to 17% of the total area. Overall, the Early-run product was found to be better than Late- and Final-run.https://www.mdpi.com/2073-4433/12/6/687satellite dataGPMIMERGradarImeldarainfall estimates |
| spellingShingle | Salman Sakib Dawit Ghebreyesus Hatim O. Sharif Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda Atmosphere satellite data GPM IMERG radar Imelda rainfall estimates |
| title | Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda |
| title_full | Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda |
| title_fullStr | Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda |
| title_full_unstemmed | Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda |
| title_short | Performance Evaluation of IMERG GPM Products during Tropical Storm Imelda |
| title_sort | performance evaluation of imerg gpm products during tropical storm imelda |
| topic | satellite data GPM IMERG radar Imelda rainfall estimates |
| url | https://www.mdpi.com/2073-4433/12/6/687 |
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