Conception et développement d'un SIG 3D dans une approche de service Web : exemple d'une application en modélisation géologique

Authors: Desgagné, Étienne
Advisor: Pouliot, Jacynthe
Abstract: Several application domains like Geology, Archeology and Architecture require an explicit management of the 3rd dimension to adequately support the analysis and decision-making process. But do we currently have the adequate tools to manage this 3rd dimension? For example, Computer Assisted Design (CAD) systems are reliable for modeling solids but have limited capability for spatial analysis and data storage. Geographic Information Systems (GIS) and Database Management Systems (DBMS) can handle visualization and storage for some 3D models but they only offer a small portion of the modeling and analysis capacities that they generally offer in 2D. Meanwhile, the International Organization for Standardization (ISO) and the Open Geospatial Consortium OGC started to update some of their standards like the ISO 19107 Spatial Schema and the Geography Markup Language (GML) in order to normalize the management of the 3rd dimension of spatial data. The current study provides a report on the capabilities of available geotechnologies to manage 3D spatial data and presents the fundamental characteristics of a new 3D-GIS based on a multi-tiered approach (client, server and database) with built-in web services. The architecture of this system provides a user with geometrical modeling, spatial analysis and querying capabilities of a 3D model stored with his descriptive properties in a database on a remote server. All this, carried out through the Web and implementing standards such as the WFS specification, the GML language and the ISO 19107 Spatial Schema. To test the feasibility of these proposals, a prototype of a Web Geological Feature Server (WGFS) is developed. The WGFS is an open source based framework that provides read/write access from the CAD software Gocad to 3D geological data (extracted from SIGEOM database) stored in XML format in a MySQL database. Its application server (Tomcat coupled to Deegree), gathers applicative logic as well as the bases of a 3D spatial operators library whose first operator, the 3D bounding box, has been implemented.
Document Type: Mémoire de maîtrise
Issue Date: 2010
Open Access Date: 16 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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