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Towards a 3D spatial urban energy modelling approach / Jean-Marie Bahu in International journal of 3-D information modeling, vol 3 n° 3 (July- September 2014)  

Public [article]  inInternational journal of 3-D information modeling > vol 3 n° 3 (July- September 2014) . - pp 1 - 16 Titre : Towards a 3D spatial urban energy modelling approach Type de document : Article/Communication Auteurs : Jean-Marie Bahu, Auteur ; Andreas Koch, Auteur ; Enrique Kremers, Auteur ; Syed Monjur Murshed, Auteur Année de publication : 2014 Article en page(s) : pp 1 - 16 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse des besoins [Termes IGN] chaleur [Termes IGN] données localisées 3D [Termes IGN] énergie [Termes IGN] fuite thermique [Termes IGN] milieu urbain [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] modèle orienté agent Résumé : (auteur) Today's needs to reduce the environmental impact of energy use impose dramatic changes for energy infrastructure and existing demand patterns (e.g. buildings) corresponding to their specific context. In addition, future energy systems are expected to integrate a considerable share of fluctuating power sources and equally a high share of distributed generation of electricity. Energy system models capable of describing such future systems and allowing the simulation of the impact of these developments thus require a spatial representation in order to reflect the local context and the boundary conditions. This paper describes two recent research approaches developed at EIFER in the fields of (a) geo-localised simulation of heat energy demand in cities based on 3D morphological data and (b) spatially explicit Agent-Based Models (ABM) for the simulation of smart grids. 3D city models were used to assess solar potential and heat energy demand of residential buildings which enable cities to target the building refurbishment potentials. Distributed energy systems require innovative modelling techniques where individual components are represented and can interact. With this approach, several smart grid demonstrators were simulated, where heterogeneous models are spatially represented. Coupling 3D geodata with energy system ABMs holds different advantages for both approaches. On one hand, energy system models can be enhanced with high resolution data from 3D city models and their semantic relations. Furthermore, they allow for spatial analysis and visualisation of the results, with emphasis on spatially and structurally correlations among the different layers (e.g. infrastructure, buildings, administrative zones) to provide an integrated approach. On the other hand, 3D models can benefit from more detailed system description of energy infrastructure, representing dynamic phenomena and high resolution models for energy use at component level. The proposed modelling strategies conceptually and practically integrate urban spatial and energy planning approaches. The combined modelling approach that will be developed based on the described sectorial models holds the potential to represent hybrid energy systems coupling distributed generation of electricity with thermal conversion systems. Numéro de notice : A2014-691 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.4018/ij3dim.2014070101 En ligne : https://doi.org/10.4018/ij3dim.2014070101 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75327 [article]

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138-2014031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Procedural modeling in 3D GIS environment / Eva Tsiliakou in International journal of 3-D information modeling, vol 3 n° 3 (July- September 2014)  

Public [article]  inInternational journal of 3-D information modeling > vol 3 n° 3 (July- September 2014) . - pp 17 - 34 Titre : Procedural modeling in 3D GIS environment Type de document : Article/Communication Auteurs : Eva Tsiliakou, Auteur ; Tassos Labropoulos, Auteur ; Efi Dimopoulou, Auteur Année de publication : 2014 Article en page(s) : pp 17 - 34 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] architecture de système [Termes IGN] CityEngine [Termes IGN] CityGML [Termes IGN] données localisées 3D [Termes IGN] façade [Termes IGN] modélisation 3D [Termes IGN] procédure opérationnelle [Termes IGN] SIG 3D Résumé : (auteur) 3D space registration and visualization has become an imperative need in order to optimally reflect all complex cases of rapid urbanization of property rights and restrictions. Besides, current technological advances as well as the availability of sophisticated software packages (proprietary or open source) call for 3D modeling especially in the GIS domain. Within this context, GIS community's present demands concerning the third dimension are discussed, while a variety of 3D modeling techniques is presented, with special emphasis on procedural modeling. Procedural modeling refers to a variety of techniques for the algorithmic generation of detailed 3D models and composite facade textures from sets of rules which are called grammars. In this paper procedural modeling is employed via CityEngine software focusing on the 3D visualization of the National Technical University of Athens (NTUA) campus' three-dimensional model, rendering a higher detail on the School of Rural and Surveying Engineering (SRSE). This algorithmic modeling concept is based on the principle that all real world buildings are defined by rules, since repetitive patterns and hierarchical components describe their geometry. The detailed geometries of the model derived from the application of CGA (Computer Generated Architecture) shape grammars on selected footprints, and the process resulted in a final 3D model, optimally describing the built environment and proved to be a good practice example of 3D visualization. Numéro de notice : A2014-692 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/IMAGERIE Nature : Article DOI : 10.4018/ij3dim.2014070102 En ligne : https://doi.org/10.4018/ij3dim.2014070102 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75328 [article]

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138-2014031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Scalable multi-platform distribution of spatial 3D contents / Jan Klimke in International journal of 3-D information modeling, vol 3 n° 3 (July- September 2014)  

Public [article]  inInternational journal of 3-D information modeling > vol 3 n° 3 (July- September 2014) . - pp 35 - 49 Titre : Scalable multi-platform distribution of spatial 3D contents Type de document : Article/Communication Auteurs : Jan Klimke, Auteur ; Benjamin Hagedorn, Auteur ; Jürgen Döllner, Auteur Année de publication : 2014 Article en page(s) : pp 35 - 49 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] dalle [Termes IGN] données localisées 3D [Termes IGN] mise à l'échelle [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] moteur de réalité virtuelle [Termes IGN] PlaGe (plateforme de généralisation) [Termes IGN] rendu réaliste [Termes IGN] téléphonie mobile [Termes IGN] visualisation 3D Résumé : (auteur) Virtual 3D city models provide powerful user interfaces for communication of 2D and 3D geoinformation. Providing high quality visualization of massive 3D geoinformation in a scalable, fast, and cost efficient manner is still a challenging task. Especially for mobile and web-based system environments, software and hardware configurations of target systems differ significantly. This makes it hard to provide fast, visually appealing renderings of 3D data throughout a variety of platforms and devices. Current mobile or web-based solutions for 3D visualization usually require raw 3D scene data such as triangle meshes together with textures delivered from server to client, what makes them strongly limited in terms of size and complexity of the models they can handle. This paper introduces a new approach for provisioning of massive, virtual 3D city models on different platforms namely web browsers, smartphones or tablets, by means of an interactive map assembled from artificial oblique image tiles. The key concept is to synthesize such images of a virtual 3D city model by a 3D rendering service in a preprocessing step. This service encapsulates model handling and 3D rendering techniques for high quality visualization of massive 3D models. By generating image tiles using this service, the 3D rendering process is shifted from the client side, which provides major advantages: (a) The complexity of the 3D city model data is decoupled from data transfer complexity (b) the implementation of client applications is simplified significantly as 3D rendering is encapsulated on server side (c) 3D city models can be easily deployed for and used by a large number of concurrent users, leading to a high degree of scalability of the overall approach. All core 3D rendering techniques are performed on a dedicated 3D rendering server, and thin-client applications can be compactly implemented for various devices and platforms. Numéro de notice : A2014-693 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/IMAGERIE Nature : Article DOI : 10.4018/ij3dim.2014070103 En ligne : https://doi.org/10.4018/ij3dim.2014070103 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75329 [article]

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138-2014031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

GML-based data management and semantic world modelling for a 4D forest simulation and information system / Jürgen Roβmann in International journal of 3-D information modeling, vol 3 n° 3 (July- September 2014)  

Public [article]  inInternational journal of 3-D information modeling > vol 3 n° 3 (July- September 2014) . - pp 50 - 67 Titre : GML-based data management and semantic world modelling for a 4D forest simulation and information system Type de document : Article/Communication Auteurs : Jürgen Roβmann, Auteur ; Martin Hoppen, Auteur ; Arno Bücken, Auteur Année de publication : 2014 Article en page(s) : pp 50 - 67 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications SIG [Termes IGN] forêt [Termes IGN] modélisation 4D [Termes IGN] SIG 4D [Termes IGN] simulation spatiale [Termes IGN] système de gestion de base de données Résumé : (auteur) Various types of 3D simulation applications benefit from realistic forest models. They range from flight simulators for entertainment to harvester simulators for training and tree growth simulations for research and planning. This paper's 4D forest simulation and information system integrates the necessary methods for data extraction, modelling and management. Using modern methods of semantic world modelling, tree data can efficiently be extracted from remote sensing data. The derived forest models contain position, height, crown volume, type and diameter of each tree. This data is modelled using GML-based data models to assure compatibility and exchangeability. ForestGML is the name of a new schema family developed to provide a common basis for forestry data. A flexible approach for database synchronization is used to manage the data and provide caching, persistence, a central communication hub for change distribution, and a versioning mechanism. Combining various simulation techniques and data versioning, the 4D forest simulation and information system can provide applications with “both directions” of the fourth dimension. This paper outlines the current state, new developments, and integration of tree extraction, data modelling, and data management. It also shows several applications realized with the system. Numéro de notice : A2014-694 Affiliation des auteurs : non IGN Thématique : FORET/GEOMATIQUE Nature : Article DOI : 10.4018/ij3dim.2014070104 En ligne : https://doi.org/10.4018/ij3dim.2014070104 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75330 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
138-2014031	RAB	Revue	Centre de documentation	En réserve L003	Disponible