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Wave measurements with a modified HydroBall buoy using different GNSS processing strategies / Benoit Crépeau Gendron in Geomatica, vol 73 n° 1 (March 2019)  

Public [article]  inGeomatica > vol 73 n° 1 (March 2019) . - pp 1 - 14. Titre : Wave measurements with a modified HydroBall buoy using different GNSS processing strategies Type de document : Article/Communication Auteurs : Benoit Crépeau Gendron, Auteur ; Mohamed Ali Chouaer, Auteur ; Rock Santerre, Auteur ; Mathieu Rondeau, Auteur ; Nicolas Seube, Auteur Année de publication : 2019 Article en page(s) : pp 1 - 14. Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] analyse comparative [Termes IGN] bouée dérivante [Termes IGN] mesure de précision [Termes IGN] positionnement cinématique [Termes IGN] positionnement ponctuel précis [Termes IGN] positionnement relatif temporel [Termes IGN] traitement de données GNSS [Termes IGN] vague Résumé : (auteur) One of the CIDCO’s (The Interdisciplinary Center for the Development of Ocean Mapping) HydroBall® GNSS buoys has been specifically adapted to evaluate its potential for wave measurement at centimeter accuracy level. Multiple GNSS processing strategies were tested, namely PPK (Post-Processed Kinematic), PPP (Precise Point Positioning), and TRP (Time Relative Positioning). Experiments were carried out in a hydraulic flume where waves of different amplitudes and periods were generated in a controlled environment. The wave heights obtained by the various GNSS solutions were compared with ultrasonic gauge measurements placed along the flume. The best results were obtained with the PPK and TRP solutions with root mean squared (RMS) values of 2 cm (on average). The main advantages of the TRP solution are that it does not require any reference station nearby (contrary to PPK) or precise ephemerides (required by PPP). A sinusoidal regression comparison of the wave height time series allowed determination of the wave period and amplitude with mean errors of 0.06 s and 0.8 cm, respectively. Numéro de notice : A2019-543 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1139/geomat-2018-0021 Date de publication en ligne : 15/04/2019 En ligne : https://doi.org/10.1139/geomat-2018-0021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94184 [article]

Comparison of grid averaged altimeter and buoy significant wave heights in the Northern Indian Ocean / L. Sabique in Marine geodesy, vol 36 n° 1 (January - March 2013)  

Public [article]  inMarine geodesy > vol 36 n° 1 (January - March 2013) . - pp 72 - 85 Titre : Comparison of grid averaged altimeter and buoy significant wave heights in the Northern Indian Ocean Type de document : Article/Communication Auteurs : L. Sabique, Auteur ; T. Balakrishnan Nair, Auteur ; K. Srinivas, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 72 - 85 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] altimétrie satellitaire par radar [Termes IGN] analyse diachronique [Termes IGN] AVISO [Termes IGN] bouée [Termes IGN] bouée dérivante [Termes IGN] cyclone [Termes IGN] hauteurs de mer [Termes IGN] Indien (océan) [Termes IGN] série temporelle [Termes IGN] vague Résumé : (Auteur) A quantitative comparison of the collocated inter-annual significant wave height (SWH) data collected between 2006 and 2009 from buoys and altimeters at nine buoy locations (total n = 2241) in the Northern Indian Ocean is attempted for assessing the validity of daily averaged gridded altimeter significant wave height (ASWH) provided by AVISO for operational use. ASWH is underestimated by 0.20 m, the root-mean-square error (RMSE) is less than 0.30 m, the Scatter Index is less than 20%, and the correlation coefficient is greater than 0.90. Further, at three locations, the examination of the above statistics showed that the bias and RMSE is high during the southwest monsoon season compared with the Northeast monsoon. Scatter Index showed only slight variation (14–18%) for different ranges of SWH. The response of the daily average gridded ASWH data during extreme conditions (cyclones) in the vicinity of the buoy locations is poor at all compared buoy locations. The gridded ASWH from different satellite missions provided by AVISO can be used for basin scale validation experiments of the wave model and for climatological studies in the Indian Ocean, except during cyclone conditions. Numéro de notice : A2013-246 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2012.743493 Date de publication en ligne : 13/03/2013 En ligne : https://doi.org/10.1080/01490419.2012.743493 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32384 [article]

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