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Network adjustment in surveying engineering: linear goal programming versus least squares / S. Alp in SaLIS Surveying and land information science, vol 70 n° 1 (Spring 2010)

Public [article]  inSaLIS Surveying and land information science > vol 70 n° 1 (Spring 2010) . - pp 29 - 37 Titre : Network adjustment in surveying engineering: linear goal programming versus least squares Type de document : Article/Communication Auteurs : S. Alp, Auteur ; E. Yavuz, Auteur ; N. Ersoy, Auteur Année de publication : 2010 Article en page(s) : pp 29 - 37 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] compensation de coordonnées [Termes IGN] méthode des moindres carrés [Termes IGN] programmation linéaire Résumé : (Auteur) In engineering, especially in surveying engineering, network adjustment is made to find out the definite values of the unknowns and the measurements. Generally, the least squares method is used for vertical network adjustment. In this study, the linear goal programming method is proposed as an alternative method to the least squares method for network adjustment. The linear goal programming method is explained with an example, and the results are compared. The results found by using these two methods are similar. This study confirms that linear goal programming methods can be used in vertical network adjustment. Copyright SaLIS Numéro de notice : A2010-159 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83712 [article]

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Establishment of an empirical Geoid Model for a small geographic area: a case study of Port Harcourt, Nigeria / J. Olaleye in SaLIS Surveying and land information science, vol 70 n° 1 (Spring 2010)

Public [article]  inSaLIS Surveying and land information science > vol 70 n° 1 (Spring 2010) . - pp 39 - 48 Titre : Establishment of an empirical Geoid Model for a small geographic area: a case study of Port Harcourt, Nigeria Type de document : Article/Communication Auteurs : J. Olaleye, Auteur ; K. Aleem, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 39 - 48 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] altitude orthométrique [Termes IGN] géoïde local [Termes IGN] Nigéria [Termes IGN] port [Termes IGN] système de référence local Résumé : (Auteur) It is well known that the determination of the geoid model especially by the classical gravimetric approach is not a simple task. Consequently, an empirical method is often adopted for a small geographic area. This approach is especially useful because of its simplicity, accessibility to local surveyors, and its adequacy for many applications involving the conversion of World Geodetic System 1984 (WGS 84) GPS heights to a local height reference system based on the Mean Sea Level (MSL). This paper details the procedures and processes used to establish, validate, and consider the statistical significance of a predictive geoid model for a small geographic area. The model is based on data acquired within the central areas of the Port Harcourt metropolis in southern Nigeria. The MSL benchmark of the Nigerian Ports Authority (NPA) in Port Harcourt, which was established during the colonial administration, served as the reference datum. Copyright SaLIS Numéro de notice : A2010-160 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83713 [article]

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