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Rendering interior-filled polygonal vector data in a virtual globe / Mengyun Zhou in International journal of geographical information science IJGIS, vol 30 n° 11-12 (November - December 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 11-12 (November - December 2016) . - pp 2208 - 2229 Titre : Rendering interior-filled polygonal vector data in a virtual globe Type de document : Article/Communication Auteurs : Mengyun Zhou, Auteur ; Jing Chen, Auteur ; Jianya Gong, Auteur Année de publication : 2016 Article en page(s) : pp 2208 - 2229 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] données vectorielles [Termes IGN] Global Multi-resolution Terrain Elevation Data 2010 [Termes IGN] globe virtuel [Termes IGN] modèle numérique de surface [Termes IGN] modélisation 3D [Termes IGN] polygone [Termes IGN] rendu (géovisualisation) [Termes IGN] temps réel [Vedettes matières IGN] Géovisualisation Résumé : (Auteur) Polygonal vector data are important for representing countries, lakes, residential settlements, and other polygonal features. The proper representation of polygonal vector data is the basis of efficient rendering and picking and quick access and display of the analysis results based on polygons (e.g., 3D overlaying and surface area measurement in mountainous areas) in a virtual globe. However, polygonal vector data are displayed using texture-based or boundary-based approaches in most existing virtual globes. The texture-based approach cannot easily support interactive operations (e.g., picking) and spatial analysis (e.g., adjacency analysis and spatial measurement). The boundary-based approach treats the holes as independent features; however, it is difficult to recognize which boundaries constitute a polygon. Further research is needed on how to better organize the polygons to support efficient rendering, picking, and analysis in a virtual globe. In this article, we propose two methods to drape interior filled 2D polygons onto a multi-resolution 3D terrain. Both proposed methods combine polygon clipping and polygon triangulation. The difference between the two methods is in the way holes are eliminated. Method 1 recursively subdivides a terrain triangle until the child-triangles contain no holes; every resulting clipped polygon, which is then triangulated, contains no holes. Method 2 directly clips a polygon against a terrain triangle and creates bridge edges to transform the resulting polygons with holes to degenerate polygons that are further triangulated. The experimental results demonstrate that both proposed methods can efficiently process polygons with holes resulting in appropriate numbers of triangles. The processed interior-filled polygons remain close to the terrain surface in a virtual globe. Both proposed methods support real-time rendering of polygonal vector data in a virtual globe. Numéro de notice : A2016-751 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2016.1165819 En ligne : http://dx.doi.org/10.1080/13658816.2016.1165819 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82340 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-2016061	RAB	Revue	Centre de documentation	En réserve L003	Disponible

The application of the model of coordinate S-transformation for stability analysis of datum points in high-precision GPS deformation monitoring networks / Jiming Guo in Journal of applied geodesy, vol 6 n° 3-4 (November 2012)  

Public [article]  inJournal of applied geodesy > vol 6 n° 3-4 (November 2012) . - pp 143 - 148 Titre : The application of the model of coordinate S-transformation for stability analysis of datum points in high-precision GPS deformation monitoring networks Type de document : Article/Communication Auteurs : Jiming Guo, Auteur ; Mengyun Zhou, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 143 - 148 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] centrale hydroélectrique [Termes IGN] Chine [Termes IGN] coordonnées géodésiques [Termes IGN] positionnement par GPS [Termes IGN] réseau géodésique spécifique [Termes IGN] surveillance d'ouvrage [Termes IGN] transformation de coordonnées [Termes IGN] transformation de Fourier Résumé : (Auteur) Based on the model of coordinate S-transformation, a novel method of stability analysis of datum points in high-precision GPS deformation monitoring networks is proposed. The model of coordinate S-transformation is used to calculate seven transformation parameters in adjacent two measurement stages, in order to confirm the stability of stations by coordinate differences. To judge the stability of stations, in comparison to the traditional method by a fixed the same datum point, the “threshold approach” and “statistical test approach” have been developed and applied to evaluate the stability of datum points of a first-order GPS deformation monitoring network of a hydropower station located in the West Region of China. Numéro de notice : A2012-595 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2012-0028 En ligne : https://doi.org/10.1515/jag-2012-0028 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32041 [article]