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The Canadian Geodetic Vertical Datum of 2013 (CGVD2013) / Marc Véronneau in Geomatica [en ligne], vol 70 n° 1 (March 2016)  

Public [article]  inGeomatica [en ligne] > vol 70 n° 1 (March 2016) . - pp 9 - 19 Titre : The Canadian Geodetic Vertical Datum of 2013 (CGVD2013) Type de document : Article/Communication Auteurs : Marc Véronneau, Auteur ; Jianliang Huang, Auteur Année de publication : 2016 Article en page(s) : pp 9 - 19 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] Canada [Termes IGN] géoïde altimétrique [Termes IGN] géoïde gravimétrique [Termes IGN] géoïde local [Termes IGN] mise à jour [Termes IGN] nivellement [Termes IGN] positionnement par GNSS [Termes IGN] repère de nivellement [Termes IGN] système de référence géodésique [Termes IGN] système de référence local Résumé : (auteur) The Canadian Geodetic Vertical Datum of 2013 (CGVD2013) is the first major update to the vertical datum in Canada in almost 100 years. Canada is not only moving to a new vertical datum, but it is also using a modernized approach to realize it. The modernization of the height reference system is necessary to make it compatible with Global Navigation Satellite System (GNSS), which is commonly used for positioning by a growing number of users across Canada and the world. The geodetic levelling technique, which established a nation-wide network of benchmarks with known elevations, is replaced by a geoid model that describes the vertical datum with respect to an ellipsoid, which is the reference surface for GNSS positioning. Technically, height modernization replaces the need for the maintenance of benchmarks, as users can now install their own markers at more convenient locations using GNSS. The current geoid model for CGVD2013 is the Canadian Gravimetric Geoid 2013 (CGG2013. Numéro de notice : A2016-432 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.5623/cig2016-101 En ligne : https://doi.org/10.5623/cig2016-101 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81329 [article]

Canadian gravimetric geoid model 2010 / Jianliang Huang in Journal of geodesy, vol 87 n° 8 (August 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 8 (August 2013) . - pp 771 - 790 Titre : Canadian gravimetric geoid model 2010 Type de document : Article/Communication Auteurs : Jianliang Huang, Auteur ; Marc Véronneau, Auteur Année de publication : 2013 Article en page(s) : pp 771 - 790 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] Canada [Termes IGN] géoïde gravimétrique [Termes IGN] levé gravimétrique [Termes IGN] modèle de géopotentiel local Résumé : (Auteur) A new gravimetric geoid model, Canadian Gravimetric Geoid 2010 (CGG2010), has been developed to upgrade the previous geoid model CGG2005. CGG2010 represents the separation between the reference ellipsoid of GRS80 and the Earth’s equipotential surface of W0=62,636,855.69 m2s-2 . The Stokes–Helmert method has been re-formulated for the determination of CGG2010 by a new Stokes kernel modification. It reduces the effect of the systematic error in the Canadian terrestrial gravity data on the geoid to the level below 2 cm from about 20 cm using other existing modification techniques, and renders a smooth spectral combination of the satellite and terrestrial gravity data. The long wavelength components of CGG2010 include the GOCE contribution contained in a combined GRACE and GOCE geopotential model: GOCO01S, which ranges from -20.1 to 16.7 cm with an RMS of 2.9 cm. Improvement has been also achieved through the refinement of geoid modelling procedure and the use of new data. (1) The downward continuation effect has been accounted accurately ranging from -22.1 to 16.5 cm with an RMS of 0.9 cm. (2) The geoid residual from the Stokes integral is reduced to 4 cm in RMS by the use of an ultra-high degree spherical harmonic representation of global elevation model for deriving the reference Helmert field in conjunction with a derived global geopotential model. (3) The Canadian gravimetric geoid model is published for the first time with associated error estimates. In addition, CGG2010 includes the new marine gravity data, ArcGP gravity grids, and the new Canadian Digital Elevation Data (CDED) 1:50K. CGG2010 is compared to GPS-levelling data in Canada. The standard deviations are estimated to vary from 2 to 10 cm with the largest error in the mountainous areas of western Canada. We demonstrate its improvement over the previous models CGG2005 and EGM2008. Numéro de notice : A2013-482 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0645-0 Date de publication en ligne : 12/06/2013 En ligne : https://doi.org/10.1007/s00190-013-0645-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32620 [article]

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