Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections
Information about water level is essential for hydrological monitoring and flood/drought risk assessment. In a large part of Italian river network, in situ instruments for measuring water level are rare or lacking. Here we consider the satellite measurements of water level retrieved by Copernicus al...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/13/21/4456 |
| _version_ | 1797511869456449536 |
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| author | Cristina Deidda Carlo De Michele Ali Nadir Arslan Silvano Pecora Nicolas Taburet |
| author_facet | Cristina Deidda Carlo De Michele Ali Nadir Arslan Silvano Pecora Nicolas Taburet |
| author_sort | Cristina Deidda |
| collection | DOAJ |
| description | Information about water level is essential for hydrological monitoring and flood/drought risk assessment. In a large part of Italian river network, in situ instruments for measuring water level are rare or lacking. Here we consider the satellite measurements of water level retrieved by Copernicus altimetric missions (Sentinel 3A, Sentinel 3B, Jason 2/3), and compare these with in situ data, from 19 gauging stations in Italy with a river section in the range of [50, 555] m. The results highlight the potentiality of altimetric satellite measurements for water level retrieval in a case study of Italian rivers. By comparing synchronous satellite and in situ water level difference (i.e., difference between two successive measurements in time of satellite data compared to the difference of two successive measurements in time of in situ data), we found a median value of Pearson correlation of 0.79 and 0.37 m of RMSE. Then, from water level differences, we extracted the satellite water level values with two different procedures: (1) assuming as the initial water level of the satellite measurements the first joint measurement (satellite–in situ data) and (2) calibrating the initial water level, minimizing the mean absolute error metric. The results show the feasibility of using satellite data for water level retrieval in an operative and automatic perspective. |
| first_indexed | 2024-03-10T05:53:06Z |
| format | Article |
| id | doaj.art-9f3388be1eb94d17b7b05eb96ff53159 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T05:53:06Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-9f3388be1eb94d17b7b05eb96ff531592023-11-22T21:33:45ZengMDPI AGRemote Sensing2072-42922021-11-011321445610.3390/rs13214456Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River SectionsCristina Deidda0Carlo De Michele1Ali Nadir Arslan2Silvano Pecora3Nicolas Taburet4Department of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milano, ItalyDepartment of Civil and Environmental Engineering, Politecnico di Milano, 20133 Milano, ItalyFinnish Meteorological Institute, 00560 Helsinki, FinlandAutorità di Bacino del Fiume Po, 43121 Parma, ItalyCollect Localisation Satellites, 31520 Ramonville Saint-Agne, FranceInformation about water level is essential for hydrological monitoring and flood/drought risk assessment. In a large part of Italian river network, in situ instruments for measuring water level are rare or lacking. Here we consider the satellite measurements of water level retrieved by Copernicus altimetric missions (Sentinel 3A, Sentinel 3B, Jason 2/3), and compare these with in situ data, from 19 gauging stations in Italy with a river section in the range of [50, 555] m. The results highlight the potentiality of altimetric satellite measurements for water level retrieval in a case study of Italian rivers. By comparing synchronous satellite and in situ water level difference (i.e., difference between two successive measurements in time of satellite data compared to the difference of two successive measurements in time of in situ data), we found a median value of Pearson correlation of 0.79 and 0.37 m of RMSE. Then, from water level differences, we extracted the satellite water level values with two different procedures: (1) assuming as the initial water level of the satellite measurements the first joint measurement (satellite–in situ data) and (2) calibrating the initial water level, minimizing the mean absolute error metric. The results show the feasibility of using satellite data for water level retrieval in an operative and automatic perspective.https://www.mdpi.com/2072-4292/13/21/4456water levelCopernicusaltimetercomparisonin situ dataaccuracy |
| spellingShingle | Cristina Deidda Carlo De Michele Ali Nadir Arslan Silvano Pecora Nicolas Taburet Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections Remote Sensing water level Copernicus altimeter comparison in situ data accuracy |
| title | Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections |
| title_full | Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections |
| title_fullStr | Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections |
| title_full_unstemmed | Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections |
| title_short | Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections |
| title_sort | accuracy of copernicus altimeter water level data in italian rivers accounting for narrow river sections |
| topic | water level Copernicus altimeter comparison in situ data accuracy |
| url | https://www.mdpi.com/2072-4292/13/21/4456 |
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