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Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France / Stavros A. Melachroinos in Journal of geodesy, vol 82 n° 6 (June 2008)
[article]
Titre : Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France Type de document : Article/Communication Auteurs : Stavros A. Melachroinos, Auteur ; Richard Biancale, Auteur ; Muriel Llubes, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 357 - 371 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] baie
[Termes IGN] Bretagne
[Termes IGN] Cotentin
[Termes IGN] marée océanique
[Termes IGN] modèle physique
[Termes IGN] Mont-Saint-Michel
[Termes IGN] plateau continental
[Termes IGN] positionnement par GPS
[Termes IGN] série temporelle
[Termes IGN] surcharge océanique
[Termes IGN] trajet multipleRésumé : (Auteur) In this paper we examine OTL displacements detected by GPS stations of a dedicated campaign and validate ocean tide models. Our area of study is the continental shelf of Brittany and Cotentin in France. Brittany is one of the few places in the world where tides provoke loading displacements of ?10–12 cm vertically and a few cm horizontally. Ocean tide models suffer from important discrepancies in this region. Seven global and regional ocean tide models were tested: FES2004 corrected for K2, TPXO.7.0, TPXO.6.2, GOT00.2, CSR4.0, NAO.99b and the most recent regional grids of the North East Atlantic (NEA2004). These gridded amplitudes and phases of ocean tides were convolved in order to get the predicted OTL displacements using two different algorithms. Data over a period of 3.5 months of 8 GPS campaign stations located on the north coast of Brittany are used, in order to evaluate the geographical distribution of the OTL effect. We have modified and implemented new algorithms in our GPS software, GINS 7.1. GPS OTL constituents are estimated based on 1-day batch solutions. We compare the observed GPS OTL constituents of M2, S2, N2 and K1 waves with the selected ocean tide models on global and regional grids. Large phase-lag and amplitude discrepancies over 20° and 1.5 cm in the vertical direction in the semi-diurnal band of M2 between predictions and GPS/models are detected in the Bay of Mont St-Michel. From a least squares spectral analysis of the GPS time-series, significant harmonic peaks in the integer multiples of the orbital periods of the GPS satellites are observed, indicating the existence of multipath effects in the GPS OTL constituents. The GPS OTL observations agree best with FES2004, NEA2004, GOT00.2 and CSR4.0 tide models. Copyright Springer Numéro de notice : A2008-315 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0185-6 En ligne : https://doi.org/10.1007/s00190-007-0185-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29308
in Journal of geodesy > vol 82 n° 6 (June 2008) . - pp 357 - 371[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08051 SL Revue Centre de documentation Revues en salle Disponible GPS estimates of ocean tide loading in NW-France: Determination of ocean tide loading constituents and comparison with a recent ocean tide model / Mathilde Vergnolle in Geophysical journal international, vol 173 n° 2 (May 2008)
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Titre : GPS estimates of ocean tide loading in NW-France: Determination of ocean tide loading constituents and comparison with a recent ocean tide model Type de document : Article/Communication Auteurs : Mathilde Vergnolle, Auteur ; Marie-Noëlle Bouin , Auteur ; Laurent Morel, Auteur ; F. Masson, Auteur ; S. Durand, Auteur ; J. Nicolas, Auteur ; Stavros A. Melachroinos, Auteur Année de publication : 2008 Article en page(s) : pp 444 - 458 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] amplitude
[Termes IGN] analyse harmonique
[Termes IGN] effet de charge
[Termes IGN] France (administrative)
[Termes IGN] marée océanique
[Termes IGN] série temporelleRésumé : (auteur) Ocean loading effects cause 3-D displacements large enough to affect space geodesy measurements either at the subdiurnal periods or at longer time scales by the means of spurious signals. GPS measurements, in turn, could provide local improvements of the models in coastal areas if their ability to precisely monitor such rapid displacements is assessed. In this paper, we use 105 days of continuous GPS measurements collected in 2004 in the French Brittany and Cotentin region to investigate: (1) the precision achieved by the GPS analysis on measuring 3-D subdiurnal displacements and amplitude and phase of the tidal constituents, (2) the quality of the most recent ocean tide model FES2004 in such a complex coastal context. Indeed, in this area, tide amplitudes are among the largest in the world (up to 16 cm of loading displacements on the vertical component) and are believed to show strong shallow-water tides. From a state of the art GPS analysis using the scientific GAMIT software over 2-h sessions, we test two independent strategies for the realization of the reference frame. The position time series are then compared with the displacements predicted by the FES2004 model applied on an elastic Earth model. The two sets of results are consistent with each other at the same level of agreement than with the predicted displacements, namely 3-5 mm on the horizontal components, 10 mm on the vertical. This assesses the capability of this technique for measuring 3-D ocean tide loading deformation. We validate the FES2004 model in the Brittany area, even though it slightly (2-7 mm) underestimates the three components amplitudes. With a harmonic analysis of the observed position time series, we obtain nevertheless an agreement at a submillimetre level for the M2, N2, O1, Q1 tidal constituents and at a millimetre level for the K1 and S2 tidal constituents. Moreover, we can extract a significant M4 load signal at the 95 per cent confidence level from the GPS time series at the stations located in the Mont St Michel area. The detection of other shallow-water constituents would be helpful to understand the amplitude deficit between the FES2004 predicted and GPS observed displacements. Numéro de notice : A2008-616 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.2008.03734.x Date de publication en ligne : 01/05/2008 En ligne : https://doi.org/10.1111/j.1365-246X.2008.03734.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102899
in Geophysical journal international > vol 173 n° 2 (May 2008) . - pp 444 - 458[article]Terrestrial reference frame implementation in global GPS analysis at TIGA ULR consortium / Guy Wöppelmann in Physics and chemistry of the Earth (A/B/C), vol 33 n° 3-4 ([01/05/2008])
[article]
Titre : Terrestrial reference frame implementation in global GPS analysis at TIGA ULR consortium Type de document : Article/Communication Auteurs : Guy Wöppelmann , Auteur ; Marie-Noëlle Bouin , Auteur ; Zuheir Altamimi , Auteur Année de publication : 2008 Projets : TIGA / Article en page(s) : pp 217 - 224 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] données marégraphiques
[Termes IGN] repère de référence terrestre conventionnel
[Termes IGN] série temporelle
[Termes IGN] verticaleRésumé : (auteur) Monitoring vertical land motion at tide gauges is mandatory if absolute or climate related signals in mean sea level are to be derived from coastal tide gauge records. Different glacial isostatic adjustment models provide very different predictions at the required level of a few tenth of millimetres per year accuracy, while other processes that may affect the vertical stability of tide gauges are still more difficult to predict. An alternative approach is to measure the rates of vertical land motions at the tide gauges. Continuous GPS recordings are presently the most practical and accurate technical solution to address such an issue. The most adequate way to handle the GPS processing seems to be a global scale approach in consistency with the size of the issues: geocentric reference frame realization, long-term stability, global climate change. The laboratories CLDG (Centre Littoral De Géophysique) and LAREG (Laboratoire de Recherches en Géodésie) contribute to the Tide Gauge Benchmark Monitoring (TIGA) IGS pilot project since October 2002 by routinely processing a global set of about 140 GPS sites within the ULR analysis centre consortium. The set comprises about 122 TG-CGPS stations that are analysed using a free network approach. Time series of more than six years are now available. The accuracy of the vertical component is very sensitive to the reference frame definition and realization. We therefore performed some tests in order to quantify the impact of various analysis options on the stability of our realization. We compared the stability of our global solutions with respect to ITRF2000 solution and to its IGS realization called IGS00, while changing the number of reference stations and their geometry. The results indicate that the more reference stations are used the better the alignment to ITRF is performed. A large global distribution of the reference frame stations seems to mitigate individual station problems. The reference frame implementation is achieved within several millimetres accuracy on a weekly basis. The tests indicate that the choice of IGS00 or ITRF2000 datum was not a relevant issue to perform the alignment to ITRF at this level of accuracy. Numéro de notice : A2008-639 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.pce.2006.11.001 Date de publication en ligne : 04/05/2007 En ligne : https://doi.org/10.1016/j.pce.2006.11.001 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103447
in Physics and chemistry of the Earth (A/B/C) > vol 33 n° 3-4 [01/05/2008] . - pp 217 - 224[article]The early explanatory power of NDVI in crop yield modelling / L. Wall in International Journal of Remote Sensing IJRS, vol 29 n° 7 (April 2008)
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Titre : The early explanatory power of NDVI in crop yield modelling Type de document : Article/Communication Auteurs : L. Wall, Auteur ; D. Larocque, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 2211 - 2225 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse comparative
[Termes IGN] analyse diachronique
[Termes IGN] blé (céréale)
[Termes IGN] Canada
[Termes IGN] image NOAA-AVHRR
[Termes IGN] indice d'humidité
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] prévision
[Termes IGN] rendement agricole
[Termes IGN] série temporelleRésumé : (Auteur) The objective of this paper is to study, on a weekly basis, the explanatory power of one satellite-based measurement, the Normalized Difference Vegetation Index (NDVI), for wheat yield modelling in 40 census agricultural regions (CAR) in the Canadian Prairies during the whole growing season using 16 years of NOAA AVHRR satellite data (between 1987 and 2002). We also explore the relative value of NDVI compared with a land-based measurement, the Cumulative Moisture Index (CMI). By developing a series of weekly wheat yield models over the course of the growing season, we are able to determine the accuracy of different models. Our findings indicate that NDVI possesses explanatory power 4 weeks earlier in the season than CMI. Copyright Taylor & Francis Numéro de notice : A2008-099 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160701395252 En ligne : https://doi.org/10.1080/01431160701395252 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29094
in International Journal of Remote Sensing IJRS > vol 29 n° 7 (April 2008) . - pp 2211 - 2225[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 080-08051 RAB Revue Centre de documentation En réserve L003 Disponible Fast error analysis of continuous GPS observations / M. Bos in Journal of geodesy, vol 82 n° 3 (March 2008)
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Titre : Fast error analysis of continuous GPS observations Type de document : Article/Communication Auteurs : M. Bos, Auteur ; R. Fernandes, Auteur ; S. Williams, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 157 - 166 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] bruit blanc
[Termes IGN] classification par maximum de vraisemblance
[Termes IGN] données GPS
[Termes IGN] incertitude des données
[Termes IGN] série temporelleRésumé : (Auteur) It has been generally accepted that the noise in continuous GPS observations can be well described by a power-law plus white noise model. Using maximum likelihood estimation (MLE) the numerical values of the noise model can be estimated. Current methods require calculating the data covariance matrix and inverting it, which is a significant computational burden. Analysing 10 years of daily GPS solutions of a single station can take around 2 h on a regular computer such as a PC with an AMD AthlonTM 64 X2 dual core processor. When one analyses large networks with hundreds of stations or when one analyses hourly instead of daily solutions, the long computation times becomes a problem. In case the signal only contains power-law noise, the MLE computations can be simplified to a O(N log N) process where N is the number of observations. For the general case of power-law plus white noise, we present a modification of the MLE equations that allows us to reduce the number of computations within the algorithm from a cubic to a quadratic function of the number of observations when there are no data gaps. For time-series of three and eight years, this means in practise a reduction factor of around 35 and 84 in computation time without loss of accuracy. In addition, this modification removes the implicit assumption that there is no environment noise before the first observation. Finally, we present an analytical expression for the uncertainty of the estimated trend if the data only contains power-law noise. Copyright Springer Numéro de notice : A2008-167 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0165-x En ligne : https://doi.org/10.1007/s00190-007-0165-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29162
in Journal of geodesy > vol 82 n° 3 (March 2008) . - pp 157 - 166[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08031 RAB Revue Centre de documentation En réserve L003 Disponible 266-08032 RAB Revue Centre de documentation En réserve L003 Disponible Techniques for computing fitness of use (FoU) for time series datasets with applications in the geospatial domain / L. Fu in Geoinformatica, vol 12 n° 1 (March - May 2008)PermalinkAnalyse des séries temporelles de positions des stations de géodésie spatiale : application au repère international de référence terrestre (ITRF) / Xavier Collilieux (2008)PermalinkAnomalous harmonics in the spectra of GPS position estimates / Jim Ray in GPS solutions, vol 12 n° 1 (January 20008)PermalinkPermalinkPermalinkMutual validation of satellite-geodetic techniques and its impact on GNSS orbit modeling / Claudia Flohrer (2008)PermalinkProceedings of the 15th international workshop on laser ranging, Canberra, Australia, 15 - 20 October 2006 / J. Luck (2008)PermalinkPermalinkRule-based classification of multi-temporal satellite imagery for habitat and agricultural land cover mapping / Robert Lucas in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 3 (August 2007)PermalinkDORIS satellite phase center determination and consequences on the derived scale of the Terrestrial Reference Frame / Pascal Willis in Advances in space research, vol 39 n° 10 (May 2007)PermalinkChamp de vitesses de l'ITRF, propriétés cinématiques de la croute terrestre et condition de non rotation globale / Juliette Legrand (2007)PermalinkPermalinkPseudo-stochastic orbit modeling of low earth satellites using the Global Positioning System / Adrian Jäggi (2007)PermalinkDORIS contribution to ITRF2005 / Zuheir Altamimi in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkError analysis of weekly station coordinates in the DORIS network / Simon D.P. Williams in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkEstimating the noise in space-geodetic positioning: the case of DORIS / Karine Le Bail in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkA novel method for mapping land cover changes: Incorporating time and space with geostatistics / A. Boucher in IEEE Transactions on geoscience and remote sensing, vol 44 n° 11 Tome 2 (November 2006)PermalinkPlate kinematic of Nubia-Somalia using combined DORIS and GPS solution / Jean-Mathieu Nocquet in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkSpectral normalisation and fusion of optical sensors for the retrieval of BRDF and albedo: application to vegetation, MODIS, and MERIS data sets / O. Samain in IEEE Transactions on geoscience and remote sensing, vol 44 n° 11 Tome 1 (November 2006)PermalinkSeaWIFS discrimination of harmful algal bloom evolution / P.I. Miller in International Journal of Remote Sensing IJRS, vol 27 n° 11 (June 2006)PermalinkRepères de référence terrestres, rotation de la terre et télémétrie laser sur satellites / David Coulot in Géomatique expert, n° 50 (01/05/2006)PermalinkEffet de moyenne par moindres carrés, application à l'analyse des séries temporelles laser / David Coulot in Bulletin d'information scientifique et technique de l'IGN, n° 75 (mars 2006)PermalinkÉvaluation de la qualité des séries temporelles de mesures en géodesie spatiale / Karine Le Bail in Bulletin d'information scientifique et technique de l'IGN, n° 75 (mars 2006)PermalinkError-sensitive historical GIS: Identifying areal interpolation errors in time-series data / I.N. Gregory in International journal of geographical information science IJGIS, vol 20 n° 2 (february 2006)PermalinkEinführung in die Spektral- und Zeitreihenanalyse mit Beispielen aus der Geodäsie / A. Teusch (2006)PermalinkPermalinkSystèmes de référence terrestres / Zuheir Altamimi (2006)PermalinkIs there utility in rigorous combinations of VLBI and GPS Earth orientation parameters? / Jim Ray in Journal of geodesy, vol 79 n° 9 (December 2005)PermalinkEvaluation of co-location ties relating the VLBI and GPS reference frames / Jim Ray in Journal of geodesy, vol 79 n° 4-5 (July 2005)PermalinkDoris satellite antenna maps derived from long-term residuals time series / Pascal Willis in Advances in space research, vol 36 n° 3 (March 2005)PermalinkLong-term stability of the terrestrial reference frame / Zuheir Altamimi in Advances in space research, vol 36 n° 3 (March 2005)PermalinkAnalyse des stochastischen Modells von GPS-Trägerphasenbeobachtungen / J. Howind (2005)PermalinkEstimation des paramètres de transformation entre différentes versions de l'ITRF / P. Nouaille-Degorce (2005)PermalinkPermalinkIntegrating land-cover data with different ontologies: identifying change from inconsistency / A. Comber in International journal of geographical information science IJGIS, vol 18 n° 7 (november 2004)PermalinkAssessing the effects of human-induced land degradation in the former homelands of northern South Africa with a 1 km AVHRR NDVI time-series / K.J. Wessels in Remote sensing of environment, vol 91 n° 1 (15/05/2004)PermalinkPermalinkPermalinkCombinaison de séries temporelles des positions des stations et des paramètres de rotation de la Terre / Zuheir Altamimi in Bulletin d'information scientifique et technique de l'IGN, n° 74 (mars 2003)PermalinkPermalinkPermalinkLes statistiques en géographie / Pierre Dumolard (2003)PermalinkCurrent strain regime in the Western Alps from continuous Global Positioning System measurements, 1996–2001 / Eric Calais in Geology, vol 30 n° 7 (July 2002)PermalinkWorkshop 12 Knowledge discovery from temporal and spatial data / Christophe Dousson (2002)PermalinkTowards an Integrated Global Geodetic Observing System (IGGOS). Quality analysis of some IGS weekly combined solutions with respect to ITRF / Zuheir Altamimi (01/03/2001)Permalink