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A spatial analysis of GEOID03 and GEOID09 in Connecticut / Kazi Arifuzzaman in Journal of applied geodesy, vol 10 n° 2 (June 2016)  

Public [article]  inJournal of applied geodesy > vol 10 n° 2 (June 2016) . - pp 95 - 102 Titre : A spatial analysis of GEOID03 and GEOID09 in Connecticut Type de document : Article/Communication Auteurs : Kazi Arifuzzaman, Auteur ; Raymond J. Hintz, Auteur Année de publication : 2016 Article en page(s) : pp 95 - 102 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] analyse spatiale [Termes IGN] Connecticut (Etats-Unis) [Termes IGN] krigeage [Termes IGN] North American Vertical Datum 1988 [Termes IGN] régression [Termes IGN] United States Gravimetric Geoid 2009 Résumé : (auteur) The National Geodetic Survey (NGS) recommends using a hybrid geoid model to derive orthometric heights from ellipsoid heights. The accuracy of GEOID03 and GEOID09 were assessed independently in Connecticut. The present research analyses the spatial behavior of residuals derived from the comparison of differential levelled NAVD 88 orthometric heights and GPS-derived orthometric heights (using GEOID03 & GEOID09) at 72 benchmarks in Connecticut. Both geometrical and geostatistical analyses were performed on the residuals. A planar regression model indicates a weak spatial relation for residuals derived from GEOID03. This weakness was not noted in the analysis of residuals derived from GEOID09. Results of a four-parameter regression model does not indicate any need for a correction surface. A kriging surface was created with a fitted spherical semivariogram model and suggests GEOID09 captures more spatial variability of geoid undulation than GEOID03 in Connecticut. Numéro de notice : A2016-557 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2015-0013 En ligne : http://dx.doi.org/10.1515/jag-2015-0013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81717 [article]

Assessing the accuracy of GEOID03 and GEOID09 in Connecticut / Thomas H. Meyer in SaLIS Surveying and land information science, vol 70 n° 2 (Summer 2010)

Public [article]  inSaLIS Surveying and land information science > vol 70 n° 2 (Summer 2010) . - pp 89 - 101 Titre : Assessing the accuracy of GEOID03 and GEOID09 in Connecticut Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; Kazi Arifuzzaman, Auteur ; D. Massalski, Auteur Année de publication : 2010 Article en page(s) : pp 89 - 101 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] altitude orthométrique [Termes IGN] Connecticut (Etats-Unis) [Termes IGN] données GNSS [Termes IGN] géoïde local Résumé : (Auteur) Comparing published NAVD 88 Helmert orthometric heights of First-Order bench marks against GPS-derived orthometric heights showed that GEOID03 and GEOID09 perform at their reported accuracy in Connecticut. GPS-derived orthometric heights were determined by subtracting geoid undulations from ellipsoid heights obtained from a network least-squares adjustment of GPS occupations in 2007 and 2008. A total of 73 markers were occupied in these stability classes: 25 class A, 11 class B, 12 class C, 2 class D bench marks, and 23 temporary marks with transferred elevations. Adjusted ellipsoid heights were compared against OPUS as a check. We also tested networks in which no phase-center variations were applied and in which all vectors (including "substandard" vectors) were included. Numéro de notice : A2010-403 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83714 [article]

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