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Root mean square error compared to, and contrasted with, standard deviation / Thomas H. Meyer in SaLIS Surveying and land information science, vol 72 n° 3 (September 2012)

Public [article]  inSaLIS Surveying and land information science > vol 72 n° 3 (September 2012) . - pp 107 - 108 Titre : Root mean square error compared to, and contrasted with, standard deviation Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur Année de publication : 2012 Article en page(s) : pp 107 - 108 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Statistiques [Termes IGN] analyse comparative [Termes IGN] écart type [Termes IGN] erreur moyenne quadratique Résumé : (Auteur) This short note defines and discusses root mean square error and standard deviation. These ideas are very similar so confusion about them has arisen. This short note highlights their differences, concluding with a list that shows how they provide different information about an observation set. Numéro de notice : A2012-689 Affiliation des auteurs : non IGN Thématique : MATHEMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83716 [article]

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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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What does height really mean? Part 3 height systems / Thomas H. Meyer in Surveying and land information science, vol 66 n° 2 (01/09/2006)

Public [article]  inSurveying and land information science > vol 66 n° 2 (01/09/2006) . - pp 149 - 160 Titre : What does height really mean? Part 3 height systems Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2006 Article en page(s) : pp 149 - 160 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie [Termes IGN] altitude dynamique [Termes IGN] altitude normale [Termes IGN] altitude orthométrique [Termes IGN] cote géopotentielle [Termes IGN] géoïde [Termes IGN] hauteur ellipsoïdale [Termes IGN] North American Vertical Datum 1988 Résumé : (Auteur) This is the third paper in a four-part series considering the fundamental question, “what does the word “height” really mean?” The first paper reviewed reference ellipsoids and mean sea level datums. The second paper reviewed the physics of heights culminating in a simple development of the geoid and explained why mean sea level stations are not all at the same orthometric height. This third paper develops the principle notions of height, namely measured, differentially deduced changes in elevation, orthometric heights, Helmert orthometric heights, normal orthometric heights, dynamic heights, and geopotential numbers. We conclude with a more in-depth discussion of current thoughts regarding the geoid. Copyright SaLIS Numéro de notice : A2006-471 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28195 [article]

Voir aussi

• What does height really mean? Part 2: physics and gravity / Thomas H. Meyer in Surveying and land information science, vol 65 n° 1 (01/03/2005)
• What does height really mean? Part 4 GPS heighting / Thomas H. Meyer in Surveying and land information science, vol 66 n° 3 (01/09/2006)

What does height really mean? Part 4 GPS heighting / Thomas H. Meyer in Surveying and land information science, vol 66 n° 3 (01/09/2006)

Public [article]  inSurveying and land information science > vol 66 n° 3 (01/09/2006) . - pp 165 - 183 Titre : What does height really mean? Part 4 GPS heighting Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2006 Article en page(s) : pp 165 - 183 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] ellipsoïde (géodésie) [Termes IGN] géoïde altimétrique [Termes IGN] hauteur ellipsoïdale [Termes IGN] nivellement par GPS [Termes IGN] précision des données Résumé : (Auteur) This is the final paper in a four-part series examining the fundamental question, “What does the word height really mean?” The creation of this series was motivated by the National Geodetic Survey’s (NGS) embarking on a height modernization program as a result of which NGS will publish measured ellipsoid heights and computed Helmert orthometric heights for vertical bench marks. Practicing surveyors will therefore encounter Helmert orthometric heights computed from Global Positioning System (GPS) ellipsoid heights and geoid heights determined from geoid models as their published vertical control coordinate, rather than adjusted orthometric heights determined by spirit leveling. It is our goal to explain the meanings of these terms in hopes of eliminating confusion and preventing mistakes that may arise over this change. The first paper in the series reviewed reference ellipsoids and mean sea level datums. The second paper reviewed the physics of heights culminating in a simple development of the geoid in order to explain why mean sea level stations are not all at the same orthometric height. The third paper introduced orthometric heights, geopotential numbers, dynamic heights, normal heights, and height systems. This fourth paper is composed of two sections. The first considers the stability of the geoid as a datum. The second is a review of current best practices for heights measured with the Global Positioning System (GPS), essentially taking the form of a commentary on NGS’ guidelines for high-accuracy ellipsoid and orthometric height determination using GPS. Copyright SaLIS Numéro de notice : A2006-582 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28305 [article]

Voir aussi

• What does height really mean? Part 3 height systems / Thomas H. Meyer in Surveying and land information science, vol 66 n° 2 (01/09/2006)

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What does height really mean? Part 2: physics and gravity / Thomas H. Meyer in Surveying and land information science, vol 65 n° 1 (01/03/2005)

Public [article]  inSurveying and land information science > vol 65 n° 1 (01/03/2005) . - pp 5 - 15 Titre : What does height really mean? Part 2: physics and gravity Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur ; D.R. Roman, Auteur ; David B. Zilkoski, Auteur Année de publication : 2005 Article en page(s) : pp 5 - 15 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] altitude [Termes IGN] ellipsoïde (géodésie) [Termes IGN] force de gravitation [Termes IGN] géoïde [Termes IGN] gravimétrie [Termes IGN] niveau moyen des mers [Termes IGN] nivellement par GPS [Termes IGN] potentiel de pesanteur terrestre Résumé : (Auteur) This is the second paper in a four-part series considering the fundamental question, "what does the word height really mean ?" The first paper in this series explained that a change in National Geodetic Survey's policy, coupIed with the modern realities of GPS surveving, have essentially forced practicing surveyors to come to grips with the myriad of height definitions that previously were the sole concern of geodesists. The distinctions between local and equipotential ellipsoids were considered, along with an introduction to mean sea level. This paper brings these ideas foward by explaining mean sea level and, more importantly, the geoid. The discussion is grounded in physics from which gravitational force and potential energy will be considered, leading to a simple derivation of the shape of the Earth's gravity field. This lays the foundation for a simplistic model of the geoid near Mt. Everest, which will be used to explain the undulations in the geoid across the entire Earth. The terms geoid, plumb line, potential, equipotential surface, geopotential number and mean sea level will be explained, including a discussion of why mean sea level is not everywhere the same height, why it is not a level surface. Numéro de notice : A2005-280 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27416 [article]

Voir aussi

• What does height really mean? Part 1: Introduction / Thomas H. Meyer in Surveying and land information science, vol 64 n° 4 (01/12/2004)
• What does height really mean? Part 3 height systems / Thomas H. Meyer in Surveying and land information science, vol 66 n° 2 (01/09/2006)

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What does height really mean? Part 1: Introduction / Thomas H. Meyer in Surveying and land information science, vol 64 n° 4 (01/12/2004)

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The discontinuous nature of kriging interpolation for digital terrain modelling / Thomas H. Meyer in Cartography and Geographic Information Science, vol 31 n° 4 (October 2004)  

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The effect of broadleaf canopies on survey-grade horizontal GPS-GLONASS measurements / Thomas H. Meyer in Surveying and land information systems, vol 62 n° 4 (01/12/2002)

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Grid, ground, and globe : Distances in the GPS era / Thomas H. Meyer in Surveying and land information science, vol 62 n° 3 (01/09/2002)

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