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Lowest astronomical tide in the North Sea derived from a vertically referenced shallow water model, and an assessment of its suggested sense of safety / D. Slobbe in Marine geodesy, vol 36 n° 1 (January - March 2013)
[article]
Titre : Lowest astronomical tide in the North Sea derived from a vertically referenced shallow water model, and an assessment of its suggested sense of safety Type de document : Article/Communication Auteurs : D. Slobbe, Auteur ; R. Klees, Auteur ; M. Verlaan, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 31 - 71 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Océanographie
[Termes IGN] géoïde local
[Termes IGN] geoïde marin
[Termes IGN] marée océanique
[Termes IGN] niveau de la mer
[Termes IGN] niveau moyen des mers
[Termes IGN] Nord, mer du
[Termes IGN] réductionRésumé : (Auteur) Water level reduction with global navigation satellite systems in bathymetric surveying requires knowledge of the ellipsoidal heights of lowest astronomical tide (LAT). The traditional approach uses tidal water levels of an ocean tide model, which are subtracted from mean sea level (MSL). This approach has two major drawbacks: the modeled water levels refer to an equipotential surface, which differs from MSL, and MSL may not be known close to the coast. Here, we propose to model LAT directly relative to an equipotential surface (geoid). This is conceptually consistent with the flow equations and allows the inclusion of temporal MSL variations into the LAT definition. Numerical experiments for the North Sea show that significant differences between the traditional and the pursued approach exist if average monthly variations in MSL are included. A validation of the modeled LAT using tide gauge records reveals systematic errors, which we attribute to both the model and the tidal analysis procedure. We also show that the probability that water levels drop below LAT is high, with maximum frequency of once per week in the eastern North Sea. Therefore, we propose to reconsider the deterministic concept of LAT by a probabilistic chart datum concept, and we quantified the differences between them. Numéro de notice : A2013-245 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=32383
in Marine geodesy > vol 36 n° 1 (January - March 2013) . - pp 31 - 71[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 230-2013011 RAB Revue Centre de documentation En réserve L003 Disponible The height datum problem and the role of satellite gravity models / A. Gatti in Journal of geodesy, vol 87 n° 1 (January 2013)
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Titre : The height datum problem and the role of satellite gravity models Type de document : Article/Communication Auteurs : A. Gatti, Auteur ; M. Reguzzoni, Auteur ; Giovanna Venuti, Auteur Année de publication : 2013 Article en page(s) : pp 15 - 22 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude normale
[Termes IGN] anomalie de pesanteur
[Termes IGN] données GOCE
[Termes IGN] données GRACE
[Termes IGN] Earth Gravity Model 2008
[Termes IGN] erreur en altitude
[Termes IGN] erreur systématique
[Termes IGN] géoïde altimétrique
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] modèle de géopotentiel
[Termes IGN] niveau moyen des mers
[Termes IGN] réseau de nivellement
[Termes IGN] système de référence altimétriqueRésumé : (Auteur) Regional height systems do not refer to a common equipotential surface, such as the geoid. They are usually referred to the mean sea level at a reference tide gauge. As mean sea level varies (by +1 to 2 m) from place to place and from continent to continent each tide gauge has an unknown bias with respect to a common reference surface, whose determination is what the height datum problem is concerned with. This paper deals with this problem, in connection to the availability of satellite gravity missions data. Since biased heights enter into the computation of terrestrial gravity anomalies, which in turn are used for geoid determination, the biases enter as secondary or indirect effect also in such a geoid model. In contrast to terrestrial gravity anomalies, gravity and geoid models derived from satellite gravity missions, and in particular GRACE and GOCE, do not suffer from those inconsistencies. Those models can be regarded as unbiased. After a review of the mathematical formulation of the problem, the paper examines two alternative approaches to its solution. The first one compares the gravity potential coefficients in the range of degrees from 100 to 200 of an unbiased gravity field from GOCE with those of the combined model EGM2008, that in this range is affected by the height biases. This first proposal yields a solution too inaccurate to be useful. The second approach compares height anomalies derived from GNSS ellipsoidal heights and biased normal heights, with anomalies derived from an anomalous potential which combines a satellite-only model up to degree 200 and a high-resolution global model above 200. The point is to show that in this last combination the indirect effects of the height biases are negligible. To this aim, an error budget analysis is performed. The biases of the high frequency part are proved to be irrelevant, so that an accuracy of 5 cm per individual GNSS station is found. This seems to be a promising practical method to solve the problem. Numéro de notice : A2013-070 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0574-3 Date de publication en ligne : 03/07/2012 En ligne : https://doi.org/10.1007/s00190-012-0574-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32208
in Journal of geodesy > vol 87 n° 1 (January 2013) . - pp 15 - 22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2013011 SL Revue Centre de documentation Revues en salle Disponible GIS-based modeling of sea level rise effect on coastal property management policies / C. A. Nettleman in SaLIS Surveying and land information science, vol 72 n° 4 (December 2012)
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Titre : GIS-based modeling of sea level rise effect on coastal property management policies Type de document : Article/Communication Auteurs : C. A. Nettleman, Auteur ; Thomas Ruppert, Auteur ; Amr Abd-Elrahman, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 173 - 187 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] modèle numérique de surface
[Termes IGN] montée du niveau de la mer
[Termes IGN] niveau moyen des mers
[Termes IGN] planification côtière
[Termes IGN] surveillance du littoral
[Termes IGN] système d'information géographiqueRésumé : (Auteur)Florida is threatened by sea level rise (SLR) because of its low elevation and populous coastlines. With only a 0.3 m future water level rise, most of Florida's natural beaches will disappear; with a 1.2 m rise, 2.4 million people will be displaced and 730,000 hectares of land lost. The only way to combat this threat is through coastal policy making. Currently, counties in Florida have no way to choose “good” policies due to the lack of needed information. Using high-resolution digital elevation models (DEM) derived from airborne light detection and ranging (LiDAR) measurements, parcel data, and beach transects from the Army Corps of Engineers, the effects of Sea Level Rise (SLR) on two study areas in Key West (Monroe County) and Pinellas County were analyzed in this study, under three policy scenarios: armoring prohibition, armoring, and relocation (rolling easements). To better address the SLR uncertainty, a range of SLR estimates from 0.15 m to 1.35 m, in 0.15 m increments, was used to simulate the three policy options. Each policy scenario was considered in view of selected primary criteria for each policy, obtained from literature and simulating them using ArcGIS. The results show that Key West would be rapidly inundated by rising waters, leaving little room for “relocation” but the mainland of Pinellas would be inundated much more slowly, allowing for progressive policy options to be implemented. Numéro de notice : A2014-393 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73865
in SaLIS Surveying and land information science > vol 72 n° 4 (December 2012) . - pp 173 - 187[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 121-2012041 RAB Revue Centre de documentation En réserve L003 Disponible Multi-model validation of currents in the Chesapeake Bay region in June 2010 / P. Chu in Marine geodesy, vol 35 n° 4 (October - December 2012)
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Titre : Multi-model validation of currents in the Chesapeake Bay region in June 2010 Type de document : Article/Communication Auteurs : P. Chu, Auteur ; G. Jacobs, Auteur ; K. Cambazoglu, Auteur ; R. Linzell, Auteur Année de publication : 2012 Article en page(s) : pp 399 - 428 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bathymétrie
[Termes IGN] bathymétrie acoustique
[Termes IGN] Chesapeake (baie de)
[Termes IGN] courant marin
[Termes IGN] Etats-Unis
[Termes IGN] image NOAA
[Termes IGN] littoral
[Termes IGN] marégraphe
[Termes IGN] modèle hydrographique
[Termes IGN] niveau de l'eau
[Termes IGN] niveau moyen des mersRésumé : (Auteur) In this paper, we discuss the validation of water level and current predictions from three coastal hydrodynamic models and document the resource and operational requirements for each modeling system. The ADvanced CIRCulation Model (ADCIRC), the Navy Coastal Ocean Model (NCOM), and Delft3D have been configured and validated for the Chesapeake Bay region during a Navy exercise. Water level predictions are compared with a NOAA/NOS water level gauge at the Chesapeake Bay Bridge Tunnel location while current predictions are validated with Acoustic Doppler Profiler (ADP) measurement records at three locations in the lower Chesapeake Bay. Statistical metrics such as correlation coefficient and root mean square error (RMSE) are computed. Both the vertically-integrated currents and currents at varying water depths are compared as well. The model-data comparisons for surface elevation indicate all three models agreed well with water level gauge data. The two-dimensional version of ADCIRC, ADCIRC2D, and NCOM yield better statistics, in terms of correlation and RMSE, than Delft3D. For vertically-integrated currents, ADCIRC2D has the smallest RMSE at Thimble Shoal and Naval Station locations while NCOM has the smallest RMSE at Cape Henry. For the horizontal currents over the water column, the fully three-dimensional, baroclinic ADCIRC model, ADCIRC3D, and NCOM both showed better agreement with the ADP measurements. Numéro de notice : A2012-668 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1080/01490419.2012.709477 Date de publication en ligne : 04/12/2012 En ligne : https://doi.org/10.1080/01490419.2012.709477 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32114
in Marine geodesy > vol 35 n° 4 (October - December 2012) . - pp 399 - 428[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 230-2012041 RAB Revue Centre de documentation En réserve L003 Disponible The spherical Slepian basis as a means to obtain spectral consistency between mean sea level and the geoid / D. Slobbe in Journal of geodesy, vol 86 n° 8 (August 2012)
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Titre : The spherical Slepian basis as a means to obtain spectral consistency between mean sea level and the geoid Type de document : Article/Communication Auteurs : D. Slobbe, Auteur ; F. Simons, Auteur ; R. Klees, Auteur Année de publication : 2012 Article en page(s) : pp 609 - 628 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] algorithme de Gram-Schmidt
[Termes IGN] cohérence (physique)
[Termes IGN] filtre passe-bas
[Termes IGN] fonction orthogonale
[Termes IGN] géoïde gravimétrique
[Termes IGN] niveau moyen des mersRésumé : (Auteur) The mean dynamic topography (MDT) can be computed as the difference between the mean sea level (MSL) and a gravimetric geoid. This requires that both data sets are spectrally consistent. In practice, it is quite common that the resolution of the geoid data is less than the resolution of the MSL data, hence, the latter need to be low-pass filtered before the MDT is computed. For this purpose conventional low-pass filters are inadequate, failing in coastal regions where they run into the undefined MSL signal on the continents. In this paper, we consider the use of a bandlimited, spatially concentrated Slepian basis to obtain a low-resolution approximation of the MSL signal. We compute Slepian functions for the oceans and parts of the oceans and compare the performance of calculating the MDT via this approach with other methods, in particular the iterative spherical harmonic approach in combination with Gaussian low-pass filtering, and various modifications. Based on the numerical experiments, we conclude that none of these methods provide a low-resolution MSL approximation at the sub-decimetre level. In particular, we show that Slepian functions are not appropriate basis functions for this problem, and a Slepian representation of the low-resolution MSL signal suffers from broadband leakage. We also show that a meaningful definition of a low-resolution MSL over incomplete spherical domains involves orthogonal basis functions with additional properties that Slepian functions do not possess. A low-resolution MSL signal, spectrally consistent with a given geoid model, is obtained by a suitable truncation of the expansions of the MSL signal in terms of these orthogonal basis functions. We compute one of these sets of orthogonal basis functions using the Gram–Schmidt orthogonalization for spherical harmonics. For the oceans, we could construct an orthogonal basis only for resolutions equivalent to a spherical harmonic degree 36. The computation of a basis with a higher resolution fails due to inherent instabilities. Regularization reduces the instabilities but destroys the orthogonality and, therefore, provides unrealistic low-resolution MSL approximations. More research is needed to solve the instability problem, perhaps by finding a different orthogonal basis that avoids it altogether. Numéro de notice : A2012-375 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0543-x Date de publication en ligne : 20/03/2012 En ligne : https://doi.org/10.1007/s00190-012-0543-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31821
in Journal of geodesy > vol 86 n° 8 (August 2012) . - pp 609 - 628[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2012081 RAB Revue Centre de documentation En réserve L003 Disponible Estimation of the zero-height geopotential level WoLVD in a local vertical datum from inversion of co-located GPS, leveling and geoid heights: a case study in the Hellenic islands / Christopher Kotsakis in Journal of geodesy, vol 86 n° 6 (June 2012)PermalinkEffect of climatic cycles in Pacific Ocean on mean sea level variations over the Southwest Pacific Ocean and Tasman Sea / Anthony Wiart (2012)PermalinkSingular spectrum analysis of global mean sea level variations / S. Khelifa in Bulletin des sciences géographiques, n° 26 (octobre 2011)PermalinkL'impact de l'élévation du niveau de la mer (2000-2010) sur le littoral libanais : une approche par télédétection et cartographie diachronique / M. El Hage in Revue Française de Photogrammétrie et de Télédétection, n° 194 (Mai 2011)PermalinkPosition: 20 kilometers, heavy construction: world's longest immersed tunnel, 40 meters underwater / A. Jensen in GPS world, vol 22 n° 5 (May 2011)PermalinkImportance du système de référence terrestre dans la mesure du niveau des mers / Xavier Collilieux in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkGlobal sea-level rise and its relation to the terrestrial reference frame / Xavier Collilieux in Journal of geodesy, vol 85 n° 1 (January 2011)PermalinkTowards development of a consistent orbit series for TOPEX, Jason-1, and Jason-2 / Franck G. Lemoine in Advances in space research, vol 46 n° 12 (15/12/2010)Permalinkvol 33 n° 4 - October - December 2010 - Tropical cyclones (Bulletin de Marine geodesy)PermalinkComprendre le niveau de la mer / M. Mayo in Géomètre, n° 2069 (avril 2010)PermalinkDétermination du niveau des mers par satellites / Ecole nationale des sciences géographiques in Géomatique expert, n° 73 (01/02/2010)PermalinkEstimation of crustal vertical movements with GPS in a geocentric frame, within the framework of the TIGA project / Alvaro Santamaria Gomez (2010)PermalinkIdentification and modelling of sea level change contributors on GRACE satellite gravity data and their applications to climate monitoring / Bert Wouters (2010)PermalinkMéthodologie GPS, mesure des déformations verticales et humidité atmosphérique / Marie-Noëlle Bouin (2010)PermalinkLe marégraphe de Marseille : patrimoine et modernité / Alain Coulomb in XYZ, n° 118 (mars - mai 2009)Permalinkvol 32 n° 2 - March - May 2009 - Storm surges around the globe: operational aspect (Bulletin de Marine geodesy) / R. LiPermalinkImpact du système de référence terrestre sur la montée du niveau moyen des mers par marégraphie / Xavier Collilieux (2009)PermalinkGeoid, sea level and vertical datum of the Arctic improved by ICESAT and GRACE / Henriette Skourup in Geomatica, vol 62 n° 2 (June 2008)PermalinkLarge-scale errors in ERS altimeter data / J.Y. Cherniawsky in Marine geodesy, vol 31 n° 1 (March - May 2008)PermalinkGOCE's measurements of the gravity field and beyond / R. Floberghaben in ESA bulletin, n° 133 (February 2008)Permalink