RT journal article
T1 Validation of Sentinel-3A SRAL Coastal Sea Level Data at High Posting Rate: 80 Hz
A1 Aldarias Martos, Ana Isabel
A1 Gómez Enri, Jesús
A1 Laiz Alonso, Irene María
A1 Tejedor Álvarez, María Begoña
A1 Vignudelli, Stefano
A1 Cipollini, P
A2 Física Aplicada
K1 Coastal altimetry
K1 high data rate
K1 synthetic aperture radar (SAR) data
K1 oceans and water
AB Altimetry data of two and a half years(June 2016–November 2018) of Sentinel-3A SRAL (S3A-SRAL)were validated at the sampling frequency of 80 Hz. The datawere obtained from the European Space Agency (ESA) GridProcessing On Demand (GPOD) service over three coastal sitesin Spain: Huelva (HU) (Gulf of Cádiz), Barcelona (BA) (WesternMediterranean Sea), and Bilbao (BI) (Bay of Biscay). Two trackswere selected in each site: one ascending and one descending.Data were validated using in situ tide gauge (TG) data providedby the Spanish Puertos del Estado. The altimetry sea levelanomaly time series were obtained using the corrections availablein GPOD with the exception of the sea state bias (SSB) correction,not available at 80 Hz. Hence, the SSB was approximatedto 5% of the significant wave height (SWH). The validationwas performed using two statistical parameters, the Pearsoncorrelation coefficient (r) and the root mean square error (rmse).In the 5–20-km segment with respect to the coastline, the resultswere 6–8 cm (rmse) and 0.7–0.8 (r) for all the tracks. The 0–5-kmsegment was also analyzed in detail to study the land effect onthe altimetry data quality. The results showed that the trackorientation, the angle of intersection with the coast, and theland topography concur to determine the nearest distance tothe coast at which the data retain a similar level of accuracythan in the 5–20-km segment. This “distance of good quality” toshore reaches a minimum of 3 km for the tracks at HU and thedescending track at BA.
PB IEEE
SN 0196-2892
YR 2020
FD 2020
LK http://hdl.handle.net/10498/37947
UL http://hdl.handle.net/10498/37947
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 21-sep-2026