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Official GNSS-derived vertical orthometric height control network / G. Steinberg in SaLIS Surveying and land information science, vol 68 n° 1 (March 2008)

Public [article]  inSaLIS Surveying and land information science > vol 68 n° 1 (March 2008) . - pp 29 - 34 Titre : Official GNSS-derived vertical orthometric height control network Type de document : Article/Communication Auteurs : G. Steinberg, Auteur ; Gilad Even-Tzur, Auteur Année de publication : 2008 Article en page(s) : pp 29 - 34 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] altitude orthométrique [Termes IGN] conversion altimétrique [Termes IGN] géoïde local [Termes IGN] hauteur ellipsoïdale [Termes IGN] Israël [Termes IGN] nivellement par GPS [Termes IGN] positionnement par GNSS [Termes IGN] réseau de nivellement [Vedettes matières IGN] Altimétrie Résumé : (Auteur) Since the beginning of 2006, the vertical control system in Israel has been ellipsoidal. The Survey of Israel (SOI) will not continue with nationwide precise leveling. Instead, data from permanent Global Navigation Satellite Systems (GNSS) stations are used to develop and maintain Israel's ellipsoidal vertical control system. Currently, the objective is to provide a framework on which topographers and engineers can base and adjust their heights, and this is achieved more easily by GNSS measurements. Despite this, many users of height data prefer the orthometric system, even though its control is localized. A geoid undulation model is one of the foundations of the geodetic infrastructure. It is used to connect ellipsoidal and orthometric heights. Intensive utilization of GNSS for geodetic, surveying and engineering applications necessitates the development of an undulation model. Efforts to develop such a model with an accuracy level of 1 centimeter over an entire country demand multiple resources. This paper suggests a method for developing a national, orthometric control system with a reasonable accuracy, using GNSS measurements, ellipsoidal vertical control, and an official geoid undulation model. Research was conducted in Israel in order to test the feasibility of using an official geoid undulation model. Two kinds of official models were tested: the worldwide geopotential model (GPM98B) and a local, countrywide model computed by the Survey of Israel. We compared orthometric height differences obtained by GPS measurements with the known orthometric differences. This paper presents the results of those experiments. The technique proposed in this paper was found to define seamless orthometric vertical control adequate for most geodetic and surveying purposes, at low cost and fast. Of special interest in the paper is the comparison between the proposed idea and the National Geodetic Survey (NGS) attitude toward GPS-derived orthometric heights. The advantage of using the official geoid undulation model for the acquisition of orthometric heights is demonstrated. Copyright SaLIS Numéro de notice : A2008-267 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83664 [article]

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Official geoid undulations model: substitute for nationwide orthometric control network / G. Steinberg in GIM international, vol 21 n° 2 (February 2007)

Public [article]  inGIM international > vol 21 n° 2 (February 2007) . - pp 21 - 23 Titre : Official geoid undulations model: substitute for nationwide orthometric control network Type de document : Article/Communication Auteurs : G. Steinberg, Auteur ; Gilad Even-Tzur, Auteur Année de publication : 2007 Article en page(s) : pp 21 - 23 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] altitude orthométrique [Termes IGN] cohérence des données [Termes IGN] conversion altimétrique [Termes IGN] géoïde local [Termes IGN] hauteur ellipsoïdale [Termes IGN] Israël [Termes IGN] nivellement par GPS [Termes IGN] positionnement par GNSS Résumé : (Editeur) The classical geodesist’ dream of a dense, accurate, reliable and homogeneous countrywide levelling control network is a luxury even for the richest countries and will probably remain a dream. Prior to the GPS era there was no alternative to precise levelling. Now there is. The authors suggest a new approach to orthometric height control in which the best available geoid model is used as official, statutory model from which to deduce countrywide orthometric heights, while ellipsoidal heights are measured with GNSS. Developing countries may benefit. Copyright Reed Business Information Numéro de notice : A2007-019 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28385 [article]

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061-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible