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Termes IGN > mathématiques > analyse mathématique > topologie > triangulation (topologie) > Triangulated Irregular Network
Triangulated Irregular NetworkSynonyme(s)TIN ;réseau triangulé irrégulier Maillage triangulé irrégulier |
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Titre : SIG web-3D basé sur POSTGIS et X3D Type de document : Mémoire Auteurs : M. Le Serre, Auteur Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2007 Importance : 39 p. Format : 21 x 30 cm Note générale : Bibliographie
Rapport de stage, Master IASIGLangues : Français (fre) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] Ajax
[Termes IGN] conversion de données
[Termes IGN] données localisées 3D
[Termes IGN] fonctionnalité
[Termes IGN] interface web
[Termes IGN] logiciel libre
[Termes IGN] module d'extension
[Termes IGN] PostGIS
[Termes IGN] PostgreSQL
[Termes IGN] primitive volumique
[Termes IGN] SIG 3D
[Termes IGN] standard OGC
[Termes IGN] système de gestion de bases de données orientées objet
[Termes IGN] système de gestion de bases de données relationnelles
[Termes IGN] Triangulated Irregular Network
[Termes IGN] visualisation 3D
[Termes IGN] WebSIG
[Termes IGN] X3DIndex. décimale : PROJET Mémoires : Rapports de projet - stage des ingénieurs de 2e année Résumé : (Auteur) [introduction] Le but de ce stage est de permettre le stockage de géométries 3D dans PostGIS (logiciel open source) ainsi que leur export dans un format 3D, puis de développer une application web interrogeant la base de données, afin de visualiser les géométries 3D dans un navigateur web disposant du plug-in adéquat. Le programme doit respecter les normes OGC. Note de contenu : 1. LA SOCIETE ET LE CONTEXTE DU STAGE
1. Camptocamp
2. Contexte du stage
2. POSTGIS : IMPLEMENTATION DE NOUVELLES GEOMETRIES
1. Représentation des géométries dans PostGIS
2. TIN et POLYHEDRALSURFACE
1. Défînition
2. Représentation dans PostGIS
3. Implémentation
3. FONCTIONS DISPONIBLES
4. GEOS
3. FONCTIONS D'IMPORT/EXPORT
1. Import COLLADA
1. Le noeud <library_geometries>
2. Traitements des sources
3. Traitement des géométries
2. Export X3D
4. APPLICATION WEB
1. AJAX3D
2. Choix du plugin X3D
3. Réalisation d'un prototype
1. Interrogation de la base de données
2. Création de l'en-tête du fichier X3D
3. Inclusion des géométries
4. Création de la fin du fichier
5. Visualisation
5. PERSPECTIVES
1. Evolution des TIN et POLYHEDRALSURFACE
2. Evolution de l'application WEB
1. WEB3D Service
2. Chargement à la volée
3. Généralisation
4. Stockage des textures
6. CONCLUSIONNuméro de notice : 19162 Affiliation des auteurs : IGN (1940-2011) Thématique : GEOMATIQUE Nature : Mémoire masters divers Organisme de stage : Ordnance Survey (OS) ; Agence Nationale Britannique de Cartographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=51092 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 19162-01 PROJET Livre Centre de documentation Travaux d'élèves Disponible Radial topology algorithm: a new approach for deriving 2.5D GIS data models / U. Lenk in Geoinformatica, vol 10 n° 4 (December 2006)
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[article]
Titre : Radial topology algorithm: a new approach for deriving 2.5D GIS data models Type de document : Article/Communication Auteurs : U. Lenk, Auteur ; Christian Heipke, Auteur Année de publication : 2006 Article en page(s) : pp 447 - 468 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] données localisées 2,5D
[Termes IGN] données localisées 2D
[Termes IGN] données vectorielles
[Termes IGN] intégration de données
[Termes IGN] modèle numérique de terrain
[Termes IGN] noeud
[Termes IGN] relation topologique
[Termes IGN] Triangulated Irregular NetworkRésumé : (Auteur) In this paper, a new method for the combination of 2D GIS vector data and 2.5D DTM represented by triangulated irregular networks (TIN) to derive integrated triangular 2.5D object-based landscape models (also known as 2.5D-GIS-TIN) is presented. The algorithm takes into account special geometric constellations and fully exploits existing topologies of both input data sets, it “sews the 2D data into the TIN like a sewing-machine” while traversing the latter along the 2D data. The new algorithm is called radial topology algorithm. We discuss its advantages and limitations, and describe ways to eliminate redundant nodes generated during the integration process. With the help of four examples from practical work we show that it is feasible to compute and work with such integrated data sets. We also discuss the integrated data models in the light of various general requirements and conclude that the integration based on triangulations has a number of distinct advantages. Copyright Springer Numéro de notice : A2006-547 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1007/s10707-006-0342-8 En ligne : https://doi.org/10.1007/s10707-006-0342-8 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28270
in Geoinformatica > vol 10 n° 4 (December 2006) . - pp 447 - 468[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 057-06041 RAB Revue Centre de documentation En réserve L003 Disponible Semantically correct 2.5D GIS data: the integration of a DTM and topographic vector data / A. Koch in ISPRS Journal of photogrammetry and remote sensing, vol 61 n° 1 (October 2006)
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Titre : Semantically correct 2.5D GIS data: the integration of a DTM and topographic vector data Type de document : Article/Communication Auteurs : A. Koch, Auteur ; Christian Heipke, Auteur Année de publication : 2006 Article en page(s) : pp 23 - 32 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] données localisées 2D
[Termes IGN] intégration de données
[Termes IGN] modèle numérique de terrain
[Termes IGN] précision sémantique
[Termes IGN] qualité sémantique
[Termes IGN] Triangulated Irregular Network
[Termes IGN] triangulation de DelaunayRésumé : (Auteur) The most commonly used topographic vector data, the reference data of national geographic information systems (GIS) are currently two-dimensional. The topography is modelled by different objects which are represented by single points, lines and areas with additional attributes containing information, for instance on the function and size of the object. In contrast, a digital terrain model (DTM) in most cases is a 2.5D representation of the earth's surface. The integration of the two data sets leads to an augmentation of the dimension of the topographic objects. However, due to inconsistencies between the data the integration process may lead to semantically incorrect results. This paper presents a new approach for the integration of a DTM and 2D GIS vector data including the re-establishment of the semantic correctness of the integrated data set. The algorithm consists of two steps. In the first step the DTM and the topographic objects are integrated without considering the semantics of the objects. This geometric integration is based on a DTM TIN (triangular irregular network) computed using a constrained Delaunay triangulation. In the second step those objects which contain implicit height information are further utilized: object representations are formulated and the semantics of the objects are considered within an optimization process using equality and inequality constraints. The algorithm is based on an inequality constrained least squares adjustment formulated as the linear complementary problem (LCP). The algorithm results in an integrated semantically correct 2.5D GIS data set. Results are presented using simulated and real data. Lakes represented by horizontal planes with increasing terrain outside the lake and roads which are composed of several tilted planes were investigated. The algorithm shows satisfying results: the constraints are fulfilled and the visualization of the integrated data set corresponds to the human view of the topography. Copyright ISPRS Numéro de notice : A2006-439 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.07.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.07.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28163
in ISPRS Journal of photogrammetry and remote sensing > vol 61 n° 1 (October 2006) . - pp 23 - 32[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-06071 SL Revue Centre de documentation Revues en salle Disponible Error assessment in two lidar-derived TIN datasets / M.H. Peng in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 8 (August 2006)
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Titre : Error assessment in two lidar-derived TIN datasets Type de document : Article/Communication Auteurs : M.H. Peng, Auteur ; T.Y. Shih, Auteur Année de publication : 2006 Article en page(s) : pp 933 - 947 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] canopée
[Termes IGN] classification dirigée
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] erreur de mesure
[Termes IGN] estimation statistique
[Termes IGN] modèle numérique de surface
[Termes IGN] occupation du sol
[Termes IGN] pente
[Termes IGN] point de vérification
[Termes IGN] précision des données
[Termes IGN] rugosité
[Termes IGN] rugosité du sol
[Termes IGN] semis de points
[Termes IGN] Triangulated Irregular Network
[Termes IGN] variabilité
[Termes IGN] végétationRésumé : (Auteur) An accuracy assessment of two lidar-derived elevation datasets was conducted in areas of rugged terrain (average slope 26.6°). Data from 906 ground checkpoints in various land-cover types were collected in situ as reference points. Analysis of the accuracy of lidar-derived elevation as a function of several factors including terrain slope, terrain aspect, and land-cover types was conducted. This paper attempts to characterize vegetation information derived from lidar data based on variables such as canopy volume, local roughness of point clouds, point spacing of lidar ground returns, and vegetation angle. This information was used to evaluate the accuracy of elevation as a function of vegetation type. The experimental results revealed that the accuracy of elevation was considerably correlated with five factors: terrain slope, vegetation angle, canopy volume, local roughness of point clouds, and point spacing of lidar ground returns. The results show a linear relationship between the elevation accuracy and the combination of vegetation angle and the point spacing of ground returns (r2 > 0.9). The combination of vegetation angle and point spacing of ground returns explains a significant amount of the variability in elevation accuracy. Elevation accuracy varied with different vegetation types. The elevation accuracy was also linearly correlated with the product of the point spacing of ground returns and the tangent of the slope (r2 = 0.9). A greater product value implies a greater elevation error. In addition, with regard to terrain aspect, one dense dataset with extra cross-flight data revealed a lesser impact of aspect on elevation accuracy. Copyright ASPRS Numéro de notice : A2006-312 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.72.8.933 En ligne : https://doi.org/10.14358/PERS.72.8.933 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28036
in Photogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 8 (August 2006) . - pp 933 - 947[article]Utilizing Voronoi cells of location data streams for accurate computation of aggregate functions in sensor networks / M. Sharifzadeh in Geoinformatica, vol 10 n° 1 (March - May 2006)
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Titre : Utilizing Voronoi cells of location data streams for accurate computation of aggregate functions in sensor networks Type de document : Article/Communication Auteurs : M. Sharifzadeh, Auteur ; C. Shahabi, Auteur Année de publication : 2006 Conférence : ACM GIS 2004, 12th ACM symposium on geographic information systems 12/11/2004 13/11/2004 Arlington Etats-Unis Selected papers Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] agrégation spatiale
[Termes IGN] analyse comparative
[Termes IGN] diagramme de Voronoï
[Termes IGN] données vectorielles
[Termes IGN] interpolation spatiale
[Termes IGN] requête spatiale
[Termes IGN] réseau de capteurs
[Termes IGN] Triangulated Irregular NetworkRésumé : (Auteur) Sensor networks are unattended deeply distributed systems whose database schema can be conceptualized using the relational model. Aggregation queries on the data sampled at each sensor node are the main means to extract the abstract characteristics of the surrounding environment. However, the non-uniform distribution of the sensor nodes in the environment leads to inaccurate results generated by the aggregation queries. In this paper, we introduce "spatial aggregations" that take into consideration the spatial location of each measurement generated by the sensor nodes. We propose the use of spatial interpolation methods derived from the fields of spatial statistics and computational geometry to answer spatial aggregations. In particular, we study Spatial Moving Average (SMA), Voronoi Diagram and Triangulated Irregular Network (TIN). Investigating these methods for answering spatial average queries, we show that the average value on the data samples weighted by the area of the Voronoi cell of the corresponding sensor node, provides the best precision. Consequently, we introduce an algorithm to compute and maintain the accurate Voronoi cell at each sensor node while the location of the others arrive on data stream. We also propose AVC-SW, a novel algorithm to approximate this Voronoi cell over a sliding window that supports dynamism in the sensor network. To demonstrate the performance of in-network implementation of our aggregation operators, we have developed prototypes of two different approaches to distributed spatial aggregate processing. Numéro de notice : A2006-096 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : 10.1007/s10707-005-4884-y En ligne : https://doi.org/10.1007/s10707-005-4884-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27823
in Geoinformatica > vol 10 n° 1 (March - May 2006)[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 057-06011 RAB Revue Centre de documentation En réserve L003 Disponible An integrated TIN and Grid method for constructing multi-resolution digital terrain models / B. Yang in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)
PermalinkTime-space modelling with terrestrial Lidar: monitoring ice cliff evolution of the glacier, Italy with ILRS-3D / A. Tamburini in GIM international, vol 19 n° 11 (November 2005)
PermalinkGestion des données multitemporelles de l'auscultation d'un monument historique / M. Koehl in Géomatique expert, n° 46 (01/10/2005)
PermalinkSIG "paysages bocagers" : un outil pour l'étude des paysages bocagers et l'aide à la décision / Erwan Bocher in Revue internationale de géomatique, vol 15 n° 3 (septembre – novembre 2005)
PermalinkDigital terrain model computation from contour lines: how to derive quality information from artifact analysis / Olivier Bonin in Geoinformatica, vol 9 n° 3 (September - November 2005)
PermalinkTechnological aspects of a full 3D cadastral registration / Jantien E. Stoter in International journal of geographical information science IJGIS, vol 19 n° 6 (july 2005)
PermalinkEmbedding landscape processes into triangulated terrain models / E.R. Vivoni in International journal of geographical information science IJGIS, vol 19 n° 4 (april 2005)
PermalinkDelaunay triangulation structured kriging for surface interpolation / Yaron Felus in Surveying and land information science, vol 65 n° 1 (01/03/2005)
PermalinkPermalinkFusion de relevés optiques et acoustiques de sites archéologiques sous marins : études de cas dans l'anse des catalans, Marseille, Volume 2. Application de travail sur les grilles et modèles de points 3D, documentation utilisateur / Rémi Provin (2005)
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