GPS position are useful to analyse movements of mobile objects. Unfortunately, the outcome can be unsatisfactory due to imprecision and signal lost. Several sensors (generic or specific ones depending on the type of vehicle) are now included into mobile objects. This article describes a new generic model that enhances the semantic trajectory model and a process to extract semantic from GPS and other sensors. This process is based on the raw data from these sensors which help identify how, why and when mobile objects are moving, in order to add semantic information to the trajectories and then design new applications such as smart GPS, reporting systems or Remote Maintenance System. This process was successfully applied to the Indre et Loire fire department and its connected ambulances.
Petit Picot by GRUAUZI n°2 -18 rue de Prony, 37303 Joué-lès-Tours France prenom.nom@gruau.com RÉSUMÉ. Les positions issues de capteurs GPS sont régulièrement employées pour analyser des déplacements d'objets mobiles. L'emploi exclusif des positions GPS s'avère insuffisant afin de détecter finement les comportements d'objets mobiles, pour des raisons d'imprécisions et de perte d'informations. Les objets mobiles sont maintenant équipés de plus en plus de capteurs complémentaires (génériques ou spécifiques à des types de véhicules). Cet article présente un modèle de trajectoires sémantique ainsi qu'une méthode pour extraire la sémantique liée à celles-ci à partir de données brutes issues de différents capteurs. Ces outils de fouille de trajectoires permettent d'identifier les activités des véhicules lors de déplacements ou d'arrêts. Ce processus a été appliqué aux déplacements d'ambulances connectées des sapeurs-pompiers d'Indre et Loire. ABSTRACT. GPS positions are useful to analyze movements of mobile objects. Unfortunately, the outcome can be unsatisfactory due to imprecision and signal lost. Several sensors (generic or specific ones depending on the type of vehicle) are now included into mobile objects. This article describes a new model for semantic trajectories. This article also presents the movement pattern extraction process based on the raw data from GPS and other sensors, which help identified vehicle activities and movement patterns. This process was successfully applied to the Indre et Loire fire department and its connected ambulances. MOTS-CLES : objet mobile, fouille de trajectoires, trajectoires sémantiques, capteurs GPS, analyse de mobilité, véhicule de secours
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