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On determining orthometric heights from a corrector surface model based on leveling observations, GNSS, and a geoid model / Su-Kyung Kim in Journal of applied geodesy, vol 12 n° 4 (October 2018)  

Public [article]  inJournal of applied geodesy > vol 12 n° 4 (October 2018) . - pp 323 - 333 Titre : On determining orthometric heights from a corrector surface model based on leveling observations, GNSS, and a geoid model Type de document : Article/Communication Auteurs : Su-Kyung Kim, Auteur ; Jihye Park, Auteur ; Daniel T. Gillins, Auteur ; Michael Dennis, Auteur Année de publication : 2018 Article en page(s) : pp 323 - 333 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] altitude orthométrique [Termes IGN] coefficient de corrélation [Termes IGN] compensation de coordonnées [Termes IGN] erreur en position [Termes IGN] géoïde gravimétrique [Termes IGN] hauteur ellipsoïdale [Termes IGN] North American Vertical Datum 1988 [Termes IGN] Oregon (Etats-Unis) [Termes IGN] système de référence altimétrique [Vedettes matières IGN] Altimétrie Résumé : (auteur) Leveling is a traditional geodetic surveying technique that has been used to realize a vertical datum. However, this technique is time consuming and prone to accumulate errors, where it relies on starting from one station with a known orthometric height. Establishing orthometric heights using Global Navigation Satellite Systems (GNSS) and a geoid model has been suggested [14], but this approach may involve less precisions than the direct measurements from leveling. In this study, an experimental study is presented to adjust the highly accurate leveling observations along with orthometric heights derived from GNSS observations and a geoid model. For the geoid model, the National Geodetic Survey’s gravimetric geoid model (TxGEOID16B) and hybrid geoid model (GEOID12B) were applied. Uncertainties in the leveled height differences, GNSS derived heights, and the geoid models were modeled, and a combined adjustment was implemented to construct the optimal combination of orthometric, ellipsoidal, and geoid height at each mark. As a result, the discrepancy from the published orthometric heights and the CSM (Corrector Surface Model) based adjusted orthometric heights with GEOID12B showed a mean and RMS of -8.5 mm and 16.6 mm, respectively, while TxGEOID16B had a mean and RMS of 28.9 mm and 34.6 mm, respectively. It should be emphasized that this approach was not influenced by the geodetic distribution of the stations where the correlation coefficients between the distance from the center of the surveying network and the discrepancy from the published heights using TxGEOID16B and GEOID12B are 0.03 and 0.36, respectively. Numéro de notice : A2018-672 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1515/jag-2018-0014 Date de publication en ligne : 29/08/2018 En ligne : https://doi.org/10.1515/jag-2018-0014 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91004 [article]

Educating students for the extensive range of surveying activities / Daniel T. Gillins in SaLIS Surveying and land information science, vol 73 n° 1 (May 2013)

Public [article]  inSaLIS Surveying and land information science > vol 73 n° 1 (May 2013) . - pp 21 - 30 Titre : Educating students for the extensive range of surveying activities Type de document : Article/Communication Auteurs : Daniel T. Gillins, Auteur ; Michael J. Olsen, Auteur ; Robert J. Schultz, Auteur Année de publication : 2013 Article en page(s) : pp 21 - 30 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes IGN] apprentissage (cognition) [Termes IGN] enseignement supérieur [Termes IGN] Etats-Unis [Termes IGN] Fédération Internationale des Géomètres [Termes IGN] métier Résumé : (Auteur) Today's surveyors are regularly involved in a wide range of activities and interface with people from multiple disciplines. For example, the International Federation of Surveyors (FIG) defines eleven detailed activities that surveyors may perform in practice, ranging from collecting and managing spatial data to evaluating and displaying spatial information. The extensive range and interdisciplinary nature of these activities makes it challenging to develop a program that educates students on all of the necessary fundamentals of each activity. This paper discusses important concepts of each activity, as defined by FIG, and presents a matrix-based approach for identifying potential educational courses that teach those concepts. The matrix format is helpful for designing a balanced curriculum because it enables visualization of which concepts are taught the most to which are taught the least. As an example of this approach, graduate geomatics courses (laser scanning, digital terrain modeling, photogrammetry, control surveying, least squares adjustments, boundary law, property surveying, global positioning system theory and practice, kinematic positioning and navigation, and geographic information systems (GIS)) from the School of Civil and Construction Engineering at Oregon State University are evaluated in the matrix format. Numéro de notice : A2014-398 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73871 [article]

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