Corentin LE BIHAN GAUTIER

Dynamic, virtual and tangible representations of the city

The aim of this thesis is to gain a better understanding of how digital and physical devices can help in understanding the evolution of the territory. European projects such as DUET, which aims to provide virtual replicas of cities that make it easy to understand the link between traffic, air quality, noise and other urban factors. By modelling the expected impacts of a potential change, it is possible to make decisions and better adapt future policy choices. Game engines are becoming increasingly interested in urban issues such as planning and development, as well as road traffic and autonomous vehicle testing.

Representation of urban geometry evolution through space-time cube

C.Gautier, J.Delanoy and G.Gesquiere

Visualizing and understanding the evolution of neighbourhoods in cities is crucial to the understanding of urban areas. While data exists to document the evolution of the urban places, we lack methods to clearly visualize the evolution of a city or a neighbourhood in time. We propose a new representation of the city that integrates 3D urban data with time, inspired by the Space-Time Cube concept. Our representation allows the visualization and comparison of different versions of the city in a single interactive 3D space, based on a graph model of the data. In addition to displaying the 3D geometry, we also integrate a direct visualization of the type of changes between each version and provide several ways to interact with the visualization. We apply our visualization technique on real urban data and show that it allows quickly apprehending the evolution of a neighbourhood.

Article link: https://hal.science/hal-04200467/

Code link: https://github.com/VCityTeam/UD-Viz

2023

UD-SV (Urban Data Services and Visualization) software project

C.Colin, C.Gautier, D.Vinasco-Alvarez, J.Delanoy, G.Gesquière, J.Samuel, S.Servigne, É.Boix, T.Dupont, M.Livebardon, V.Machado and L.Marnat

UD-SV is a set of components based on open code that allows to store, visualise, interact, navigate and query 2D and 3D city models, as well as temporal ones. UD-SV allows the integration of spatial, temporal and semantic data for urban analysis and for understanding its evolution. We describe the architecture, design, development and exemplify with some computational processes of UD-SV.

Article link: https://journals.openedition.org/mappemonde/8265

Code link: https://github.com/VCityTeam/UD-SV

Online demo: https://projet.liris.cnrs.fr/vcity/

2023

Integrating multimedia documents in 3D city models for a better understanding of territories

C.Gautier, J.Delanoy and G.Gesquiere

Digital 3D representations of urban areas, through their growing availability, are a helpful tool to better understand a territory. However, they lack contextual information about, for example, the history or functionality of buildings. On another side, multimedia documents like images, videos or texts usually contain such information. Crossing these two types of data can therefore help in the analysis and understanding of the organization of our cities. This could also be used to develop document search based on spatial navigation, instead of the classical textual query. In this paper, we propose four approaches to integrate multimedia documents in a 3D urban scene, allowing to contextualize the scene with any type of media. We combine these integration approaches with user guidance modes that allows to guide the user through the consumption of these media and support its understanding of the territory. We demonstrate the usefulness of these techniques in the context of different projects within the Lyon area (France). The use of multimedia documents integrated into a digital tour allows, for example, the iconic buildings to be contextualised or to understand the evolution of a territory through time.

Article link: https://ui.adsabs.harvard.edu/abs/2022ISPAnX4W2...69G/abstract

Code link: https://github.com/VCityTeam/UD-Demo-TIGA-Webdoc-ChemistryValley

Online demo: https://www.derrierelesfumees.com/_Contenusdlf/Carte/index.html

2022