Thierry Badard

Université Laval | ULAVAL · Department of Geomatic Sciences

Airborne LiDAR scanning is a promising approach to providing high-resolution products that are appropriate for different applications, such as flood management. However, the vertical accuracy of airborne LiDAR point clouds is not constant and varies in space. Having a better knowledge of their accuracy will assist decision makers in more accurately...

GPS trajectories collected from automotive telematics for insurance purposes go beyond being a collection of points on the map. They are in fact a powerful data source that we can use to extract map and road network properties. While the location of road junctions is readily available, the information about the traffic control element regulating th...

We present a new method for the simplification of 3D point clouds for digital twin city models. Such data usually contains a large amount of redundant information, noise and outliers. This implies that most of subsequent processing tasks are costly both in terms of processing times and hardware infrastructure. The core idea of this paper is that mo...

Antimicrobial resistance (AMR) is continuing to grow across the world. Though often thought of as a mostly public health issue, AMR is also a major agricultural and environmental problem. As such, many researchers refer to it as the preeminent One Health issue. Aerial transport of antimicrobial-resistant bacteria via bioaerosols is still poorly und...

Given the high frequency and major impact of flood events, decision-makers are in urgent need to have tools allowing them to predict or assess the impact of flood events on the population, such as flood simulation through digital 3D cities. While building’s lowest openings are more subject to potential damages during the flood, 3D building models o...

Background Polypharmacy is common among older adults and it represents a public health concern, due to the negative health impacts potentially associated with the use of several medications. However, the large number of medication combinations and sequences of use makes it complicated for traditional statistical methods to predict which therapy is...

Usage-Based Insurance (UBI) is an insurance framework that has made its appearance in the last few years. It allows direct measurement of the traveling of policyholders, hence the growing interest of the industry to better understand driving behaviors. UBI generates large data volumes, from which events can be extracted, like harsh brakes or accele...

Nowadays, big data are in the midst of many scientific, economic and societal issues. While most of these data include a spatial component, very few big data processing systems are able to manage this particular component. The authors have assessed the capabilities and limits of current solutions and have concluded that most of them are neither eff...

This paper addresses the problem of extracting the drainage network in forested areas. A precise description of the drainage network including intermittent streams is required for the planning of logging operations and environmental conservation. LiDAR provides now high-resolution point clouds from which the terrain is modelled and the drainage ext...

Pour offrir une assistance adéquate aux piétons souffrant d’une incapacité visuelle majeure, il est nécessaire de leur transmettre des informations spatiales pertinentes sur l’environnement de navigation. Pour ce faire, nous devrons concevoir une base de données spatiale caractérisée par sa richesse spatiale et sémantique. L’objectif de cet article...

Mobile professionals need to be assisted with suitable mobile GeoBI (Geospatial Business Intelligence) systems which are able to capture, organize and structure the user’s reality into a relevant context model and reason on it. GeoBI context modelling and reasoning are still research issues since there is not yet either a model or a relevant taxono...

Business professionals are increasingly mobile and should be supported by suitable mobile Decision Support Systems (DSS). In our previous work, we have established that such suitable mobile DSS should be (i) GeoBI(Geospatial Business Intelligence)-enabled and (ii) context-based, and have addressed issues regarding context characterization and conte...

RESUME. Le projet GéoÉduc3D vise à proposer des jeux éducatifs pour téléphones intelligents, basés sur les sciences géomatiques et exploitant la réalité augmentée pour rendre ces jeux plus immersifs. Pour améliorer l’aspect immersif et interactif de ces jeux, nous nous sommes concentrés sur l’exploitation du contexte spatial dans ce cadre applicati...

The GeoEduc3D project aims to provide educational games for smartphones based on Geomatics and use augmented reality techniques in order to make these games more immersive. To improve the immersive and interactive aspects of those games, we focused on the exploitation of spatial context in this particular application framework (serious games, augme...

The configuration of mental representation of space plays a major role in successful navigational activities. Therefore, navigational assistance for pedestrians who are blind should help them to better configure their mental representation of the environment. In this paper, we propose and exploit a computational model for the mental representation...

With the requirements for high performance results in the today’s mobile, global, highly competitive, and technology-based business world, business professionals have to get supported by convenient mobile decision support systems (DSS). To give an improved support to mobile business professionals, it is necessary to go further than just allowing a...

Spatial OLAP (SOLAP) réalisées jusqu'à présent sont conçues pour les environnements informatiques de bureau. Dans le but de supporter l'aide à la décision géo-spatiale en situation de mobilité, certaines adaptations à SOLAP sont nécessaires. Cet article décrit une solution, basée sur les architectures orientées services et les technologies des serv...

Background: Climate change has a significant impact on population health. Population vulnerabilities depend on several determinants of different types, including biological, psychological, environmental, social and economic ones. Surveillance of climate-related health vulnerabilities must take into account these different factors, their interdepen...

Data warehouses are being considered as efficient components of decision support systems. They are usually structured as datacubes, i.e. according to the multidimensional paradigm. Spatial datacubes contain spatial components which allow spatial visualization and aggregation. One may need to use several spatial datacubes which may be heterogeneous...

The exchange of roadway data among organizations, producers and users remains difficult these days, despite the many tools and applications available to transform and integrate them. This is mainly due to the great heterogeneity of the segmentation modes of roadway networks. Over the last few years, many data models (e.g.: NCHRP, GeoBase) and stand...

With the growing popularity of mobile computing and the empowerment of mobile devices by high end-users and decision-makers, the development of architectures based on web services for the deployment of mobile Spatial OLAP (SOLAP) applications is being perceived as a powerful solution. This paper deals with geospatial (web) Services-Oriented Archite...

In order to adequately fulfil specific requirements related to spatial database integration with 3D modeling tools, this paper presents the development of a generic and open system architecture called Web Geological Feature Server (WGFS). WGFS provides direct access through Web services to 3D geological models. WGFS is based on a three-tier archite...

SynonymsConceptual modeling of geospatial databases; Modeling geospatial databases; Modeling geospatial application databaseDefinitionApplication SchemaISO19109—Rules for application schema [1] defines an application schema as a conceptual schema for data required by one or more applications. In the context of geographic information, an application...

XML and Web Services technologies have revo- lutionized the way data are exchanged on the Internet. Meanwhile, Spatial OLAP (SOLAP) tools have emerged to bridge the gap between the Business Intelligence and Geo- graphic Information Systems domains. While Web Services specifications such as XML for Analysis enable the use of OLAP tools in Service Or...

SynonymsContent metadata; Abstract representation of geographic data; Machine readable geographic dataDefinitionIn the context of geographic information and ISO/TC 211 vocabulary, a feature catalogue refers to a description of an abstraction of reality that may be used to depict one or more geographic datasets. Consequently, it constitutes a classi...

UMapIT is an on-demand web mapping tool that is being developed in an attempt to provide Internet users with flexible means to personalize maps and interactively navigate within them. Based on a specific multiple representation database structure, it offers new functionalities to be applied at the occurrence level. These innovative functionalities...

Today, we observe a wide use of geospatial databases that are implemented in many forms (e.g. transactional centralized systems, distributed databases, multidimensional datacubes). Among those possibilities, the multidimensional datacube is more appropriate to support interactive analysis and to guide the organization's strategic decisions, especia...

As a component of the technological emergence and convergence on which tomorrow's Web 2.0 is built, Wikis are extending their applicability and redefine themselves. Based on the analysis of today's Wikis and their evolution, this paper aims at revealing possible directions for the collaborative construction ofspatial knowledge on the Web, and thus...

Laval University's Department of Geomatics Sciences is celebrating its 100th anniversary. During this century, it has become a leader in its field, and more specifically in the last 20 years. Many factors contributed to this success, such as thefirst B.Sc. in Geomatics in the world, the arrival of a new generation of professors highly involved in r...

Geographic Knowledge Discovery (GKD) requires systems that support interactive exploration of data without being slowed down by the intricacies of a SQL-type query language and cryptic data structures. GKD requires to compare maps of different phenomena or epochs, to dig into these maps to obtain detailed information, to roll-up data for more globa...

We present the OXYGENE platform, implemented at the COGIT laboratory of IGN (the French NMA). It allows for the development of interoperable geographic applications based on ISO/OGC specifications and aims at deploying researches undertaken at the IGN as "true" processing Web services.

At this time, many problems hinder the development of web based applications relying on geographic information: the lack of interoperability between geographic data models implemented in GIS software, the use of proprietary programming languages, the weak capabilities of commercial GIS for the deployment of applications over the Internet, etc. In o...

• une autre entrave au développement d'applications géographiques sur le Web est que, sans acheter des modules additionnels relativement onéreux, la plupart des logiciels SIG commerciaux ne sont pas conçus nativement pour mettre en œuvre de telles solutions. De plus, lorsqu'ils sont dotés de fonctionnalités Internet, celles-ci se limitent à la mise...

This paper addresses issues concerning the exchange and integration of geographic data between producers and users. Once a producer has delivered a geographic database to a user, who then uses it as a reference for specific applications, the database may be updated on both sides. Consequently, the integration of future updates -delivered by the pro...

Extérieur T. Devogele (Laboratoire IRENAV), T. Badard (Laboratoire COGIT)

The growth of institutional investment in Geographic Information Systems (GISs) testifies to their increasing importance as analytical decision-making tools utilising highly specialised data. However, a simple system still does not exist for the easy and consistent integration of evolutions into GIS. At present institutions either retrieve the upda...

Existing Spatial OLAP (SOLAP) applications are targeted towards desktop computer environments. In order to enable geospatial decision support in mobility contexts, SOLAP requires some modifications. This paper describes a solution, based on service- oriented architectures and Web services technologies, designed to adapt SOLAP data cubes to the requ...