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Assessment of the new national geoid height model, GEOID03 / D.R. Roman in Surveying and land information science, vol 64 n° 3 (01/09/2004)

Public [article]  inSurveying and land information science > vol 64 n° 3 (01/09/2004) . - pp 153 - 162 Titre : Assessment of the new national geoid height model, GEOID03 Type de document : Article/Communication Auteurs : D.R. Roman, Auteur ; Y.M. Wang, Auteur ; J. Hamilton, Auteur Année de publication : 2004 Article en page(s) : pp 153 - 162 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] analyse comparative [Termes IGN] conversion altimétrique [Termes IGN] Etats-Unis [Termes IGN] géoïde altimétrique [Termes IGN] géoïde gravimétrique [Termes IGN] géoïde local [Termes IGN] point d'appui [Termes IGN] point de vérification Résumé : (Auteur) The GEOID03 model was developed in the same manner as GEOID99 using an underlying gravimetric geoid, USGG2003, and updated GPS ellipsoidal heights on leveled benchmarks (GPSBMs). USGG2003 is similar to G99SSS, however, it includes an updated model for gravity anomalies in the deep ocean areas, GSF00.1. The convention surface for GEOID03 was developed from 14,185 GPSBMs at a 5 arc-minute grid interval, which provided a substantial increase in the spatial coverage and reduced errors due to the interpolation. The fit to these same points afterwards was 4.8 (2s), which was comprised of both correlated (attribuate to GEOID03) and uncorrelated (GPS observation error) signals. The uncorrelated signal was 4.2 cm (2s) and correlated signal was 2.0 cm (2s), with a 3.5km correlation wavelength. GEOID03 thus had a very good fit with the GPSBMs, and can be relied upon to convert between the NAD 83 and Navd88 datums to the centimeter level. Numéro de notice : A2004-601 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27117 [article]

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Precision of points computed from intersections of lines or planes / P. Cederholm in Surveying and land information science, vol 64 n° 3 (01/09/2004)

Public [article]  inSurveying and land information science > vol 64 n° 3 (01/09/2004) . - pp 163 - 170 Titre : Precision of points computed from intersections of lines or planes Type de document : Article/Communication Auteurs : P. Cederholm, Auteur Année de publication : 2004 Article en page(s) : pp 163 - 170 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] estimation de cohérence [Termes IGN] intersection spatiale [Termes IGN] lasergrammétrie [Termes IGN] méthode des moindres carrés [Termes IGN] positionnement par GPS [Termes IGN] précision géométrique (imagerie) [Termes IGN] semis de points Résumé : (Auteur) Not all points are directly accessible when doing detail surveys with GPS. This paper suggests a method for estimating these points. The points are computed from intersections of lines that are surveyed with GPS. The lines are computed by least squares estimation. Further, the suggested method estimates the precision of the points. When using laser scanning a similar problem appears. A laser scanner captures a 3D point cloud, not the points of real interest. The suggested method can be used to compute three-dimensional coordinates of the intersection of three planes estimated from the point cloud. The method can also be used to predict the precision of the points prior to a survey. An example is given. Numéro de notice : A2004-602 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27118 [article]

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121-04031	SL	Revue	Centre de documentation	Revues en salle	Disponible

The 3-point resection problem in photogrammetry / W. Tan in Surveying and land information science, vol 64 n° 3 (01/09/2004)

Public [article]  inSurveying and land information science > vol 64 n° 3 (01/09/2004) . - pp 177 - 179 Titre : The 3-point resection problem in photogrammetry Type de document : Article/Communication Auteurs : W. Tan, Auteur Année de publication : 2004 Article en page(s) : pp 177 - 179 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] convergence [Termes IGN] itération [Termes IGN] méthode itérative de Newton-Raphson [Termes IGN] photogrammétrie numérique [Termes IGN] relèvement Résumé : (Auteur) This paper provides a simple solution to the three-point resection problem in photogrammetry. it is based on Grunert's (1841) closed form solution but uses the Newton-Raphson iteration procedure, and its desirable property of quadratic convergence, to solve the quartic equation. The proposed solution is superior to closed-form solution with multiple roots. Although four-point closed form formulas also exist to define a unique solution, they are quite complex. Numéro de notice : A2004-603 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27119 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
121-04031	SL	Revue	Centre de documentation	Revues en salle	Disponible