Filters








134 Hits in 7.4 sec

SAR Mode Altimetry Observations of Internal Solitary Waves in the Tropical Ocean Part 1: Case Studies

Adriana Santos-Ferreira, José da Silva, Jorge Magalhaes
2018 Remote Sensing  
NASA) and OLCI (Ocean Land Colour Imager from ESA).  ...  Here we demonstrate that the synthetic aperture radar altimeter (SRAL) on board the Sentinel-3A can detect short-period ISWs.  ...  such as Jason-2/3, we expect the new SRAL operating on board Sentinel-3A and Sentinel-3B to perform better in the detection of ISWs.  ... 
doi:10.3390/rs10040644 fatcat:r476varvkfeqjds2mziq22eehi

Evolution of the Performances of Radar Altimetry Missions from ERS-2 to Sentinel-3A over the Inner Niger Delta

Cassandra Normandin, Frédéric Frappart, Adama Telly Diepkilé, Vincent Marieu, Eric Mougin, Fabien Blarel, Bertrand Lubac, Nadine Braquet, Abdramane Ba
2018 Remote Sensing  
, 31 for Sentinel-3A and 8, 8, 9 for Jason-1, Jason-2 and Jason-3 respectively.  ...  In this study, comparisons between altimetry-based water stages derived from acquisitions of Jason-1, Jason-2 and Jason-3, ERS-2, ENVISAT, SARAL and Sentinel-3A and in situ water levels from  ...  The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.  ... 
doi:10.3390/rs10060833 fatcat:64l457mcijapxdqkdytlycfzyq

Editorial: Application of Satellite Altimetry in Marine Geodesy and Geophysics

Jinyun Guo, Cheinway Hwang, Xiaoli Deng
2022 Frontiers in Earth Science  
With the development of the satellite altimetry technique, altimetry modes have been created for ocean and land observations, such as the traditional pulse-limited radar, the synthetic aperture radar (  ...  .), and precise orbit determination, The coastal waveforms may be seriously contaminated by the land and seabed.  ...  ACKNOWLEDGMENTS We thank the responsible editor for handling and editing all manuscripts.  ... 
doi:10.3389/feart.2022.910562 fatcat:4fkmv3horzhj3e23ahomxtme24

The Benefits of the Ka-Band as Evidenced from the SARAL/AltiKa Altimetric Mission: Quality Assessment and Unique Characteristics of AltiKa Data

Pascal Bonnefond, Jacques Verron, Jérémie Aublanc, K. Babu, Muriel Bergé-Nguyen, Mathilde Cancet, Aditya Chaudhary, Jean-François Crétaux, Frédéric Frappart, Bruce Haines, Olivier Laurain, Annabelle Ollivier (+5 others)
2018 Remote Sensing  
The mission ended its nominal phase after 3 years in orbit and began a new phase (drifting orbit) in July 2016.  ...  It shows that the AltiKa data have similar accuracy at the centimeter level in term of absolute water level whatever the method (from local to global) and the type of water surfaces (ocean and lakes).  ...  The altimetry data used in Section 3.4 were made available by "Centre de Topographie des Océans et de l'Hydrosphère" (CTOH)-https://ctoh.legos.obs-mip.fr/.  ... 
doi:10.3390/rs10010083 fatcat:lplo2fk7rjhd3leenpvgsqqsgu

Evaluation of the Performances of Radar and Lidar Altimetry Missions for Water Level Retrievals in Mountainous Environment: The Case of the Swiss Lakes

Frédéric Frappart, Fabien Blarel, Ibrahim Fayad, Muriel Bergé-Nguyen, Jean-François Crétaux, Song Shu, Joël Schregenberger, Nicolas Baghdadi
2021 Remote Sensing  
To do so, we evaluate the quality of water level retrievals from most radar altimetry missions launched after 1995 over eight lakes in Switzerland, using the recently developed ALtimetry Time Series software  ...  The combination of the Open Loop tracking mode with the Synthetic Aperture Radar acquisition mode on SENTINEL-3A and B missions outperforms the classical Low Resolution Mode of the other missions with  ...  , JASON-3, and SENTINEL-3A and B).  ... 
doi:10.3390/rs13112196 fatcat:icvt5ys2jbhjljb4ihalxvkwki

33 years of globally calibrated wave height and wind speed data based on altimeter observations

Agustinus Ribal, Ian R. Young
2019 Scientific Data  
-2, HY-2A, SARAL, JASON-3 and SENTINEL-3A.  ...  This dataset consists of 33 years (1985 to 2018), of global significant wave height and wind speed obtained from 13 altimeters, namely: GEOSAT, ERS-1, TOPEX, ERS-2, GFO, JASON-1, ENVISAT, JASON-2, CRYOSAT  ...  Acknowledgements The authors acknowledge ongoing support from the Australian Research Council through grants DP130100215 and DP160100738 and to Integrated Marine Observing System (IMOS) for directly funding  ... 
doi:10.1038/s41597-019-0083-9 pmid:31142742 pmcid:PMC6541622 fatcat:rltsq52sdfgn3gzx4t2wc427ca

The ESA Permanent Facility for Altimetry Calibration: Monitoring Performance of Radar Altimeters for Sentinel-3A, Sentinel-3B and Jason-3 Using Transponder and Sea-Surface Calibrations with FRM Standards

Stelios Mertikas, Achilleas Tripolitsiotis, Craig Donlon, Constantin Mavrocordatos, Pierre Féménias, Franck Borde, Xenophon Frantzis, Costas Kokolakis, Thierry Guinle, George Vergos, Ilias N. Tziavos, Robert Cullen
2020 Remote Sensing  
This work presents the latest calibration results for the Copernicus Sentinel-3A and -3B and the Jason-3 radar altimeters as determined by the Permanent Facility for Altimetry Calibration (PFAC) in west  ...  Biases for Sentinel-3A Passes No. 14, 278 and 335, Sentinel-3B Passes No. 14, 71 and 335, as well as for Jason-3 Passes No. 18 and No. 109 are given.  ...  Acknowledgments: We thank very much the three reviewers and the editor for their excellent and meticulous comments and observations made on this manuscript.  ... 
doi:10.3390/rs12162642 fatcat:sv5uytkopvfmzh6fvtonjcrgzu

Absolute Calibration or Validation of the Altimeters on the Sentinel-3A and the Jason-3 over Lake Issykkul (Kyrgyzstan)

Jean-François Crétaux, Muriel Bergé-Nguyen, Stephane Calmant, Nurzat Jamangulova, Rysbek Satylkanov, Florent Lyard, Felix Perosanz, Jacques Verron, Amanda Samine Montazem, Gianfranco Le Guilcher, Delphine Leroux, Joel Barrie (+2 others)
2018 Remote Sensing  
Jason-3 operates in a Low Resolution Mode (LRM), while the Sentinel-3A operates in Synthetic Aperture Radar (SAR) mode.  ...  In 2016 and 2017, three campaigns have been organized over this lake in order to estimate the absolute bias of the nadir altimeter onboard the Jason-3 and Sentinel-3A.  ...  Acknowledgments: The altimetry data are downloaded from the CTOH of Legos. We, thus, gratefully acknowledge the CNES and the CTOH.  ... 
doi:10.3390/rs10111679 fatcat:l42gqrmcjvh5hmshotrhalgusa

Automatic Detection of Inland Water Bodies along Altimetry Tracks for Estimating Surface Water Storage Variations in the Congo Basin

Frédéric Frappart, Pierre Zeiger, Julie Betbeder, Valéry Gond, Régis Bellot, Nicolas Baghdadi, Fabien Blarel, José Darrozes, Luc Bourrel, Frédérique Seyler
2021 Remote Sensing  
Good detection of water (open water, permanent and seasonal inundation) is above 0.9 using radar altimetry backscattering from ENVISAT and Jason-2.  ...  Estimating water levels over flooded area using radar altimetry observation is difficult.  ...  Previous studies analyzing radar altimetry backscattering coefficients over land surfaces showed that high values of backscattering are observed over rivers and floodplains and low values over vegetation  ... 
doi:10.3390/rs13193804 fatcat:gydd5nqt4vdsxe4dxc65dm6m2m

Improving the Estimation of Water Level over Freshwater Ice Cover using Altimetry Satellite Active and Passive Observations

Jawad Ziyad, Kalifa Goïta, Ramata Magagi, Fabien Blarel, Frédéric Frappart
2020 Remote Sensing  
To determine lake surface states, backscattering coefficient and peakiness at Ku-band derived from the radar altimeter waveform and brightness temperature at 18.7 and 37 GHz measured by the microwave radiometer  ...  Four Canadian lakes were selected to analyze active (waveform parameters) and passive (brightness temperature) microwave data acquired by the Jason-2 radar altimetry mission: Great Slave Lake, Lake Athabasca  ...  missions operating simultaneously, not only from the 10 (Topex/Poseidon, Jason-1/2/3), 27 (Sentinel-3A and B) and 35 (ERS-1/2, ENVISAT, SARAL) -day repeat orbits, but also from Cryosat-2, first mission  ... 
doi:10.3390/rs12060967 fatcat:bmikaxdogvcgzbuoagtrwiwqqq

River ice phenology and thickness from satellite altimetry: potential for ice bridge road operation and climate studies

Elena Zakharova, Svetlana Agafonova, Claude Duguay, Natalia Frolova, Alexei Kouraev
2021 The Cryosphere  
Using Ku-band backscatter measurements from the Jason-2 and Jason-3 satellite missions (2008–2019), we demonstrate the potential of radar altimetry for the retrieval of river ice phenology dates and ice  ...  The uncertainties in the retrieval of ice event timing were within the 10 d repeat cycle of Jason-2 and Jason-3 in 88 %–90 % of the cases analysed.  ...  This research was made possible with support from the RFBR (project no. 18-05-60021-Arctic), ESA EO Science for Society (LIAM project; contract no. 4000130930/20/I-DT) and ESA CCI Lakes+ (CCI+ Phase 1  ... 
doi:10.5194/tc-15-5387-2021 fatcat:elmodfpmprggtpqjnwjoffjday

Monitoring Lake Volume Variation from Space Using Satellite Observations—A Case Study in Thac Mo Reservoir (Vietnam)

Binh Pham-Duc, Frederic Frappart, Quan Tran-Anh, Son Tong Si, Hien Phan, Son Nguyen Quoc, Anh Pham Le, Bach Do Viet
2022 Remote Sensing  
between surface water level derived from Jason-3 altimetry data and from in situ measurement (R = 0.99; RMSE = 0.86 m).  ...  Variation of surface water volume is estimated based on variation of surface water extent, derived from Sentinel-1 observations, and variation of surface water level, derived from Jason-3 altimetry data  ...  for providing Jason-3 radar altimetry data.  ... 
doi:10.3390/rs14164023 fatcat:rap2zn3b6zbzlkmr233cl5s3km

Editorial for Special Issue "Advances in Satellite Altimetry and Its Application"

Denise Dettmering, Marcello Passaro, Alexander Braun
2019 Remote Sensing  
This special issue compiles studies from different disciplines presenting recent advances in the field of radar and laser altimetry including new and future altimetry missions and their applications.  ...  It comprises eight research papers as well as one review paper, and covers method development as well as applications, which target diverse Earth systems (oceans, coastal regions, sea-ice, inland) as well  ...  [8] assessed the performance for Sentinel-3 inland water level products. They focused on the minimization of the land contamination over small-to medium-sized water bodies (down to 130 m).  ... 
doi:10.3390/rs11242913 fatcat:ir2qdnmim5e6fc6s6cpjfyuqwu

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

Cristina Deidda, Carlo De Michele, Ali Nadir Arslan, Silvano Pecora, Nicolas Taburet
2021 Remote Sensing  
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  ...  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  ...  We thank the Associate Editor and the anonymous Reviewers for their positive and constructive comments, which helped to improve the presentation of our results.  ... 
doi:10.3390/rs13214456 fatcat:bfdnom7ndzfgbipfp2jttiltvi

Sentinel-3A SRAL Global Statistical Assessment and Cross-Calibration with Jason-3

Jungang Yang, Jie Zhang, Changying Wang
2019 Remote Sensing  
with the Jason-3 mission.  ...  The comparisons at the dual-crossovers show the consistency of the observation between Sentinel-3A SRAL and Jason-3, and indicate that the systemic bias of SSH is about 2.96 cm.  ...  Acknowledgments: The authors would like to thank the EUMETSAT for Sentinel-3A/3B data, the CNES AVISO for Jason-3 data.  ... 
doi:10.3390/rs11131573 fatcat:qvcz3tt6tffwxgonoykto6dfae
« Previous Showing results 1 — 15 out of 134 results