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Large scale reference database [le référentiel à grande échelle français] / R. Rollins in GIM international, vol 20 n° 9 (September 2006)
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Titre : Large scale reference database [le référentiel à grande échelle français] Type de document : Article/Communication Auteurs : R. Rollins, Auteur Année de publication : 2006 Article en page(s) : pp 45 - 47 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] BD Adresse
[Termes IGN] BD ortho
[Termes IGN] BD Parcellaire
[Termes IGN] BD Topo
[Termes IGN] cadastre
[Termes IGN] coordonnées géographiques
[Termes IGN] Institut géographique national (France)
[Termes IGN] référentiel à grande échelleRésumé : (Auteur) All users of geo-information require large-scale maps accurate to the metre or even, in urban areas, the decimetre. This, along with anticipated new uses and needs, has driven development of France’s Large Scale Reference (RGE) database. The work has meant rectifying the coordinates of digital cadastral maps to fit existing orthophotos and topographic databases. Copyright GITC Numéro de notice : A2006-342 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28066
in GIM international > vol 20 n° 9 (September 2006) . - pp 45 - 47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 061-06091 SL Revue Centre de documentation Revues en salle Disponible What does height really mean? Part 3 height systems / Thomas H. Meyer in Surveying and land information science, vol 66 n° 2 (01/09/2006)
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Titre : What does height really mean? Part 3 height systems Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2006 Article en page(s) : pp 149 - 160 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] altitude dynamique
[Termes IGN] altitude normale
[Termes IGN] altitude orthométrique
[Termes IGN] cote géopotentielle
[Termes IGN] géoïde
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] North American Vertical Datum 1988Résumé : (Auteur) This is the third paper in a four-part series considering the fundamental question, “what does the word “height” really mean?” The first paper reviewed reference ellipsoids and mean sea level datums. The second paper reviewed the physics of heights culminating in a simple development of the geoid and explained why mean sea level stations are not all at the same orthometric height. This third paper develops the principle notions of height, namely measured, differentially deduced changes in elevation, orthometric heights, Helmert orthometric heights, normal orthometric heights, dynamic heights, and geopotential numbers. We conclude with a more in-depth discussion of current thoughts regarding the geoid. Copyright SaLIS Numéro de notice : A2006-471 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28195
in Surveying and land information science > vol 66 n° 2 (01/09/2006) . - pp 149 - 160[article]What does height really mean? Part 4 GPS heighting / Thomas H. Meyer in Surveying and land information science, vol 66 n° 3 (01/09/2006)
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Titre : What does height really mean? Part 4 GPS heighting Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2006 Article en page(s) : pp 165 - 183 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] ellipsoïde (géodésie)
[Termes IGN] géoïde altimétrique
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] nivellement par GPS
[Termes IGN] précision des donnéesRésumé : (Auteur) This is the final paper in a four-part series examining the fundamental question, “What does the word height really mean?” The creation of this series was motivated by the National Geodetic Survey’s (NGS) embarking on a height modernization program as a result of which NGS will publish measured ellipsoid heights and computed Helmert orthometric heights for vertical bench marks. Practicing surveyors will therefore encounter Helmert orthometric heights computed from Global Positioning System (GPS) ellipsoid heights and geoid heights determined from geoid models as their published vertical control coordinate, rather than adjusted orthometric heights determined by spirit leveling. It is our goal to explain the meanings of these terms in hopes of eliminating confusion and preventing mistakes that may arise over this change. The first paper in the series reviewed reference ellipsoids and mean sea level datums. The second paper reviewed the physics of heights culminating in a simple development of the geoid in order to explain why mean sea level stations are not all at the same orthometric height. The third paper introduced orthometric heights, geopotential numbers, dynamic heights, normal heights, and height systems. This fourth paper is composed of two sections. The first considers the stability of the geoid as a datum. The second is a review of current best practices for heights measured with the Global Positioning System (GPS), essentially taking the form of a commentary on NGS’ guidelines for high-accuracy ellipsoid and orthometric height determination using GPS. Copyright SaLIS Numéro de notice : A2006-582 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28305
in Surveying and land information science > vol 66 n° 3 (01/09/2006) . - pp 165 - 183[article]Voir aussiRéservation
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Code-barres Cote Support Localisation Section Disponibilité 121-06031 RAB Revue Centre de documentation En réserve L003 Disponible On linear transformations of spatial data using the structured total least norm principle / Yaron Felus in Cartography and Geographic Information Science, vol 33 n° 3 (July 2006)
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Titre : On linear transformations of spatial data using the structured total least norm principle Type de document : Article/Communication Auteurs : Yaron Felus, Auteur Année de publication : 2006 Article en page(s) : pp 195 - 205 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] coordonnées géographiques
[Termes IGN] erreur de mesure
[Termes IGN] itération
[Termes IGN] système de coordonnées
[Termes IGN] transformation de coordonnées
[Termes IGN] transformation linéaireRésumé : (Auteur) Coordinate transformation is the process of converting spatial data from a source coordinate to a target coordinate system. A set of control points, measured in the two coordinate systems, is used to estimate the transformation parameters. In general, more control points are measured, and the over-determined system is adjusted using the least squares method. However, the standard least squares method assumes that errors exist only in the measurements made at one coordinate system, or at the observation vector (y). This is not the case in many physical systems where errors exist in all the measurements made in both the source coordinate and the target coordinate systems. The Structured Total Least Norm (STLN) method is a relatively new mathematical concept developed to solve estimation problems of so-called Error-In-Variables (EIV) models. The method is specifically suitable for dealing with transformation problems, since it can handle the special structure of the data matrix (A). The STLN method is uniquely used to compute the parameters of common linear coordinate transformations (affine and similarity). A numerical example is presented to demonstrate the superiority of this technique in terms of accuracy and to compare the standard LS method, the generalized LS algorithm, and the STLN approach. Copyright CaGISociety Numéro de notice : A2006-551 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1559/152304006779077273 En ligne : https://doi.org/10.1559/152304006779077273 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28274
in Cartography and Geographic Information Science > vol 33 n° 3 (July 2006) . - pp 195 - 205[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-06031 RAB Revue Centre de documentation En réserve L003 Disponible The use of second-generation wavelets to combine a gravimetric quasigeoid model with GPS-levelling data / A. Soltanpour in Journal of geodesy, vol 80 n° 2 (May 2006)
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Titre : The use of second-generation wavelets to combine a gravimetric quasigeoid model with GPS-levelling data Type de document : Article/Communication Auteurs : A. Soltanpour, Auteur ; H. Nahavandchi, Auteur ; Will E. Featherstone, Auteur Année de publication : 2006 Article en page(s) : pp 82 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Australie
[Termes IGN] collocation par moindres carrés
[Termes IGN] données altimétriques
[Termes IGN] fusion de données
[Termes IGN] géoïde gravimétrique
[Termes IGN] géoïde local
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] nivellement par GPS
[Termes IGN] Norvège
[Termes IGN] ondelette seconde génération
[Termes IGN] transformation en ondelettesRésumé : (Auteur) The merging of a gravimetric quasigeoid model with GPS-levelling data using second-generation wavelets is considered so as to provide better transformation of GPS ellipsoïdal heights to normal heights. Since GPS-levelling data are irregular in the space domain and the classical wavelet transform relies on Fourier theory, which is unable to deal with irregular data sets without prior gridding, the classical wavelet transform is not directly applicable to this problem. Instead, second-generation wavelets and their associated lifting scheme, which do not require regularly spaced data, are used to combine gravimetric quasigeoid models and GPS-levelling data over Norway and Australia, and the results are cross-validated. Cross-validation means that GPS-levelling points not used in the merging are used to assess the results, where one point is omitted from the merging and used to test the merged surface, which is repeated for all points in the dataset. The wavelet-based results are also compared to those from least squares collocation (LSC) merging. This comparison shows that the second-generation wavelet method can be used instead of LSC with similar results, but the assumption of stationarity for LSC is not required in the wavelet method. Specifically, it is not necessary to (some-what arbitrarily) remove trends from the data before applying the wavelet method, as is the case for LSC. It is also shown that the wavelet method is better at decreasing the maximum and minimum differences between the merged geoid and the cross-validating GPS-levelling data. Copyright Springer Numéro de notice : A2006-235 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0033-0 En ligne : https://doi.org/10.1007/s00190-006-0033-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27962
in Journal of geodesy > vol 80 n° 2 (May 2006) . - pp 82 - 93[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-06041 RAB Revue Centre de documentation En réserve L003 Disponible 266-06042 RAB Revue Centre de documentation En réserve L003 Disponible N48°26'58" : le plus long parallèle de France / K. Drame in XYZ, n° 106 (mars - mai 2006)PermalinkTeria et RGP, même combat / Anonyme in Géomatique expert, n° 49 (01/03/2006)PermalinkDes longitudes et des mers : science et progrès (3/3) / Frédéric Bretar in XYZ, n° 104 (septembre - novembre 2005)PermalinkToward an improved orthometric height system for Canada / R. Kingdon in Geomatica, vol 59 n° 3 (September 2005)PermalinkLa carte de Ptolémée / Gérard Chappart in Textes et documents pour la classe TDC, n° 896 ([15/05/2005])PermalinkDes longitudes et des mers : la genèse de la navigation (1/3) / Frédéric Bretar in XYZ, n° 102 (mars - mai 2005)PermalinkAnalyse des stochastischen Modells von GPS-Trägerphasenbeobachtungen / J. Howind (2005)PermalinkCartographie / Patrick Bouron (2005)PermalinkWhat does height really mean? Part 1: Introduction / Thomas H. Meyer in Surveying and land information science, vol 64 n° 4 (01/12/2004)PermalinkAccuracy of the coefficient expansion of the transverse Mercator projection / E. Enriquez in International journal of geographical information science IJGIS, vol 18 n° 6 (october 2004)Permalink