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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Autores principales:	Cristina Deidda, Carlo De Michele, Ali Nadir Arslan, Silvano Pecora, Nicolas Taburet
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	water level Copernicus altimeter comparison in situ data accuracy Science Q
Acceso en línea:	https://doaj.org/article/9f3388be1eb94d17b7b05eb96ff53159
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spelling	oai:doaj.org-article:9f3388be1eb94d17b7b05eb96ff531592021-11-11T18:57:41ZAccuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections10.3390/rs132144562072-4292https://doaj.org/article/9f3388be1eb94d17b7b05eb96ff531592021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4456https://doaj.org/toc/2072-4292Information 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.Cristina DeiddaCarlo De MicheleAli Nadir ArslanSilvano PecoraNicolas TaburetMDPI AGarticlewater levelCopernicusaltimetercomparisonin situ dataaccuracyScienceQENRemote Sensing, Vol 13, Iss 4456, p 4456 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	water level Copernicus altimeter comparison in situ data accuracy Science Q
spellingShingle	water level Copernicus altimeter comparison in situ data accuracy Science Q 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
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.
format	article
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
title	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_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_sort	accuracy of copernicus altimeter water level data in italian rivers accounting for narrow river sections
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9f3388be1eb94d17b7b05eb96ff53159
work_keys_str_mv	AT cristinadeidda accuracyofcopernicusaltimeterwaterleveldatainitalianriversaccountingfornarrowriversections AT carlodemichele accuracyofcopernicusaltimeterwaterleveldatainitalianriversaccountingfornarrowriversections AT alinadirarslan accuracyofcopernicusaltimeterwaterleveldatainitalianriversaccountingfornarrowriversections AT silvanopecora accuracyofcopernicusaltimeterwaterleveldatainitalianriversaccountingfornarrowriversections AT nicolastaburet accuracyofcopernicusaltimeterwaterleveldatainitalianriversaccountingfornarrowriversections
_version_	1718431661899644928

Accuracy of Copernicus Altimeter Water Level Data in Italian Rivers Accounting for Narrow River Sections

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