Surveying and land information science / American association for geodetic surveying . vol 64 n° 4Paru le : 01/12/2004 ISBN/ISSN/EAN : 1538-1242 |
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Ajouter le résultat dans votre panierWhat does height really mean? Part 1: Introduction / Thomas H. Meyer in Surveying and land information science, vol 64 n° 4 (01/12/2004)
[article]
Titre : What does height really mean? Part 1: Introduction Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2004 Article en page(s) : pp 223 - 233 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altitude orthométrique
[Termes IGN] ellipsoïde de référence
[Termes IGN] gravimétrie
[Termes IGN] hauteur ellipsoïdale
[Termes IGN] niveau moyen des mers
[Termes IGN] nivellement
[Termes IGN] point d'appui
[Termes IGN] réseau géodésique
[Termes IGN] terminologieRésumé : (Auteur) This is the first paper in a four-part series considering the fundamental question, "What does the word height really mean ? " National Geodetic Survey (NGS) is embarking on a height modernization program in which, in the future, it will not necessary for NGS to create new or maintain old orthometric height benchmarks. In their stead, NGS will publish measured ellipsoid heights and computed Helmert orthometric heihgts for survey markers. Consequently, practicing surveyors will soon be confronted with coping with these changes and differences between these types of height. Indeed, although "height" is commonly used word, an exact definition of it can be difficult to find. These article will explore the various meanings of height as used in surveying and geodesy and present a precise definition that is based on the physic of gravitational potential, along current best practices for using survey-grade GPS equipement for height measurement. Our goal is to review these basic concepts so that surveyors can avoid potential pitfalls that may be created by the new NGS height control era. The first paper reviews reference ellipsoids and mean sea level datums. The second paper reviews the physics of heights culminating in a simple development of the geoid and explains why mean sea level station are not all the same orthometric height. The third paper introduces geopotential numbers and dynamic heights, explains the correction needed to account for the non-parallelism of equipotential surfaces, and discusses how these correction were used in NAVD 88. The fouth paper presents a review of current best practices for heights measured with GPS. Numéro de notice : A2004-610 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27126
in Surveying and land information science > vol 64 n° 4 (01/12/2004) . - pp 223 - 233[article]Voir aussiRéservation
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Code-barres Cote Support Localisation Section Disponibilité 121-04041 SL Revue Centre de documentation Revues en salle Disponible Digital bathymetric models from rational profiles / R.M. Marin in Surveying and land information science, vol 64 n° 4 (01/12/2004)
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Titre : Digital bathymetric models from rational profiles Type de document : Article/Communication Auteurs : R.M. Marin, Auteur ; T.E. Martin, Auteur Année de publication : 2004 Article en page(s) : pp 235 - 242 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Nivellement
[Termes IGN] classification barycentrique
[Termes IGN] distance euclidienne
[Termes IGN] image acoustique
[Termes IGN] jeu de données
[Termes IGN] modèle logique de données
[Termes IGN] modèle numérique bathymétrique
[Termes IGN] profil bathymétrique
[Termes IGN] sonar
[Termes IGN] triangulation de DelaunayRésumé : (Auteur) This paper presents a complete methodology for the reconstruction of a digital bathymetric model from a set of scattered data. Given a set of N scattered data representing the most significant points of a bathymetric surface that have been sampled in situ over a certain area or domain, the algorithms construct a triangulation of the domain using a minimal Euclidean distance criteria with the vertices of the triangulation and interpolated suface based on profiles obtained from the original scattered dataset. This bathymetric surface is obtained applying our methodology called "rational profiles" due to every profile being obtained from a grid which has been defined with a step as a relation of two integer numbers. The main contribution of this paper lies in two fields : the triangulation method and rational profile interpolation. We show an efficient algorithm based on a modified Delaunay triangulation called "Minimum Total Distance" (MTD), applicable locally or globally. We have also developed a new set of algorithms to generate a rational grid from the original large data set so as to produce the interpolation over the domain generating the final surface. By applying this methodology to many real samples, we have demonstrated that it is possible to achieve better running times with these new algorithms. This efficient realization of the algorithms uses adapted dynamic data structures and careful caching in an integrated framework. Numéro de notice : A2004-618 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27127
in Surveying and land information science > vol 64 n° 4 (01/12/2004) . - pp 235 - 242[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 121-04041 SL Revue Centre de documentation Revues en salle Disponible GIS analysis system for investigating sulphide mineralization in south Sinai, Egypt / H. Abd-El Monsef in Surveying and land information science, vol 64 n° 4 (01/12/2004)
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Titre : GIS analysis system for investigating sulphide mineralization in south Sinai, Egypt Type de document : Article/Communication Auteurs : H. Abd-El Monsef, Auteur ; M. El-Ghawaby, Auteur ; S. Smith, Auteur Année de publication : 2004 Article en page(s) : pp 243 - 251 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG
[Termes IGN] analyse spatiale
[Termes IGN] carte géologique
[Termes IGN] cuivre
[Termes IGN] Egypte
[Termes IGN] géopositionnement
[Termes IGN] minerai
[Termes IGN] prospection minérale
[Termes IGN] système d'information géographiqueRésumé : (Auteur) Irregularity of geological variables over adjacent rock units makes the standardization and continuity of base metal spatial distribution uncertain. Previous approaches to predict preferable locations of minerale occurence had often been based on systematic data-grid-network sampling. The St.Catherine region in south Sinai has moderate deposits of sulphide mineralization. Comprehensive studies of sulphide mineralization found in the area provide evidence that this mineralization is controlled by three factors : (1) base-metal concentration distribution, (2) structure alteration and (3) intensity. Variables of each controlling factor have been represented by vector layers and then integrated and analysed using a geographic information system to produce mineral potential maps for the study area. Variables of each controlling factor were analysed for each rock type individually. This approach was used to overcome problems due to the geochemical irregularities of various rock units. Field verification of the integrated mineral potential maps confirmed the presence of copper sulphide in the vicinity of St. Catherine. It was concluded that the maps could be used to define suitable locations for sulphide mineralization exploration. Numéro de notice : A2004-612 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27128
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Code-barres Cote Support Localisation Section Disponibilité 121-04041 SL Revue Centre de documentation Revues en salle Disponible The global land information explosion: GIS-ACSM-GLIS-GITA-URISA-GE and the Atlantic institute / G. Greulich in Surveying and land information science, vol 64 n° 4 (01/12/2004)
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Titre : The global land information explosion: GIS-ACSM-GLIS-GITA-URISA-GE and the Atlantic institute Type de document : Article/Communication Auteurs : G. Greulich, Auteur Année de publication : 2004 Article en page(s) : pp 253 - 257 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] INSPIRE
[Termes IGN] organisme cartographique national
[Termes IGN] organisme international
[Termes IGN] système d'information géographiqueRésumé : (Auteur) In America, the label Geographic Information Systems, or GIS for short, has quickly replaced the somewhat awkward title " Multipurpose Cadastre", which had been assigned to a 1980 study by the National Research Council. American and Canadian land data specialists, such as geodesists, surveyors and cartographers, developed the new land management tool and were joined by other related disciplines, which all recognized the enormous potential of GIS. Several national and international organizations, devoted to GIS have sprung up in recent years. Even in Europe which has nearly a 300-year tradition of land recording and management under the heading of "Cadastre", the term has been embraced and inspired new coordinated developments. Early on, one particular organization, The Atlantic Institute, has focused on building and maintaining a professional GIS bridge between USA/Canada and Europe. In the USA, state governments have begun to create their own unique GIS, often inspired and prompted by local visionary land surveyors. GIS is growing worldwide and will be unstoppable. Numéro de notice : A2004-613 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27129
in Surveying and land information science > vol 64 n° 4 (01/12/2004) . - pp 253 - 257[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 121-04041 SL Revue Centre de documentation Revues en salle Disponible