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Virtual City Project

Progress in the field of large-scale data acquisition as well as cost reductions have allowed many cities to have their “digital double”. This is the case of the city of Lyon (France), which has at its disposal more than 540 Km² of data. 3D models are used by decision-maker in many fields ranging for example from urban planning to the simulation of physical phenomena (noise propagation, flood simulation …). Innovative new tools can also be designed with these data. This is for example the role of TUBA or the An Augmented third location that seeks to bring out new applications made possible thanks to these data. In this context, the data must be aggregated, prepared for a particular use (eg related to a simulation of physical phenomenon) and then visualized. The use of these data leads us to look at several scientific bottlenecks:

  • Agglomeration of data : The first issue concerns the agglomeration of heterogeneous data in order to fulfil the demands of experts. In our research, we are positioned in the context of interoperability based on norms and standards. We participate in the creation of standards of the Open Geospatial Consortium (OGC) and ISO TC/211. In our work, we often look at 3D data but we also follow the development of the standard concerning for example sensor, coverages or vector data.
  • City Evolution: This second aspect is already covered for many years in 2D but needs to be studied in a normative context for 3D. We are currently working on amendments proposals for standards in order to manage the evolution of city objects (buildings, vegetation, urban furniture, land). Managing the evolution of the city during time is targeted and some solutions are now available in our team.
  • Modes of representation for cities: This third point concerns the possibility of providing “dedicated view” to the researchers or practitioners we met. The model imported into a noise simulation is not necessarily the same as that required for a simulation process of water flow. A 3D model proposed to an urban planner will not possess the same elements that a model dedicated to tourism application. Our research focus consists in modifying the geometry and semantics associated with the data according to the concerned need. We want to deduce these views from the initial model in an automatic way. This point is also related to the problems of data visualization, whether it takes place in a third party application or in a Web browser. The city representation is completed in our work by media that may provide other way to understand the city.
  • Analysis tools: The last point that interests us for short-term researches is the possibility of extending 2D operators, which have existed for years, to 3D. It allows us to propose to practitioners new decision support tools when the 3D is necessary (range of antenna, measure of the inconsistencies compared to a Local Development Plan (LDP), easements around flight cones of aircraft,…). Operators are not only based on geometry; semantic and topology is also invoked.

The scientific obstacles discussed above can only be addressed if we provide tools to access, edit, and visualize 3D data of the city. These tools are lacking in many laboratories we work with, which are from the field of Communication Science or Social Science. It is in this context that the Virtual City project was born thanks to funding:

  • Université Claude Bernard as part of the call for projects BQI
  • Labex Intelligence des Mondes Urbains (IMU)
  • Companies under joint projects related to this LIRIS project.

Since 2012, we strive to develop a solid software foundation supporting today several research projects, which will be detailed on this website.

Presentation Video

start_en.txt · Last modified: 2018/10/04 22:18 by ggesquie

CNRS INSA de Lyon Université Lyon 1 Université Lyon 2 École centrale de Lyon