Alexandre Devaux

Institut national de l’information géographique et forestière | IGN · Visualization & Interaction

In the mid-1950s, the first improvised huts for Algerian workers appeared in Nanterre. Soon, these informal shacks grew together and ended up forming urban complexes, presented and administered as shantytowns, and the city of Nanterre was then durably associated with them. This article proposes to review an interdisciplinary research experience aro...

This article presents a spatio-temporal web application dedicated to the co-exploitation of heterogeneous data spatialized in a common 3D environment, providing several paradigms for supporting their co-visualization and interactions within the 3D environment and across time. The relevance of this tool is demonstrated here with two use cases involv...

This manuscript identifies and documents unsolved problems and research challenges in the extended reality (XR) domain (i.e., virtual (VR), augmented (AR), and mixed reality (MR)). The manuscript is structured to include technology, design, and human factor perspectives. The text is visualization/display-focused, that is, other modalities such as a...

A new engine for 3D geospatial data visualization on Géoportail : iTowns Visualization is a user-preferred mode of interaction for geographical information. An effective graphic representation of geographical data is all the more important when the data are massive and diverse, and when users and uses are varied. Moving beyond the 2D visualization...

For a long time people have been interested in the past and history and how we can go back in time using a time machine. And while we cannot invent a time machine, at least not yet, we can create a virtual one. Our “virtual” time machine is an interactive web application that allows users to browse through and navigate within historical images (aer...

In this work-in-progress and demo paper, we present an ongoing experiment of underground visualization, in the context of urban 3D geovisualization, for operational purposes in urban planning. After a preliminary project of sewers network digitization (Nguyen et al., 2018), the 3D model of sewers has been made available for web visualization and in...

In this paper, we assume that augmented reality (AR) and mixed reality (MR) are relevant contexts for 3D urban geovisualization, especially in order to support the design of the urban spaces. We propose to design an in situ MR application, that could be helpful for urban designers, providing tools to interactively remove or replace buildings in sit...

Geovisualization has concentrated most work in displaying static data for a long time, progress have brought incredibly detailed visualizations offline but also in web browsers thanks to GPU access. Heavy textured meshes mixed with vectorial data are common representations for users now. Animation, on the other hand, is just at its beginning. As fa...

Street-view web applications have now gained widespread popularity. Targeting the general public, they offer ease of use, but while they allow efficient navigation from a pedestrian level, the immersive quality of such renderings is still low. The user is usually stuck at specific positions and transitions bring out artefacts, in particular paralla...

En recherche comme en exploitation forestière, la donnée Lidar aéroportée apporte des clefs de compréhension sur la structure du terrain, de la forêt et par extension, des informations sur la biomasse aérienne. Mais pour être utile, cette donnée Lidar doit couvrir de vastes étendues tout en étant très résolue spatialement. Ces caractéristiques se t...

This paper introduces a novel implementation of an online spatial registration service for the 3D GIS web-based street viewer which allows end-users to interact with different spatial data (panoramic image, laser, and open data) for accessibility diagnostics and street mobility services, and to navigate an immersive and superposed multilayer urban...

Nowadays we see a lot of Rich Internet Applications (RIA), but real interactive 3D applications have just started years ago, and it is only in 2011 that a GPU library was integrated directly in the major internet browsers. This opened a new way of creating 3D applications on the web and a new public, as much more users can access them without compl...

Nous présentons dans cet article un système de numérisation mobile 3D hybride laser-image qui permet d'acquérir des infrastructures de données spatiales répondant aux besoins d'applications diverses allant de navigations multimédia immersives jusqu'à de la métrologie 3D à travers le web. Nous détaillons la conception du système, ses capteurs, son a...

This paper presents some interactive features we have added on our street-view web navigation application. Our system allows to navigate through a huge amount of data (panoramas and laser clouds) and also to interact with it. We will detail 4 aspects of this interactivity. First, the labelling, displaying of features directly into the images in the...

In the last two years, web-based applications using street-level images have been developing fast. In that context, privacy preservation is an unavoidable issue. We present in this paper a multi-boosting based approach to detect pedestrians in high resolution panoramics in order to blur their faces. This task is quite complex since these features v...