Three map samples have been designed, while taking more or less into consideration conventional uses of colors for relevant themes: hydrography, vegetation and the background layer. Our example of contextual constraint is then the optimization of the colors in order to lower the energy required to display a map. Some mobile devices required more energy to display dark colors than lighter ones. Therefore, we propose a quantification of the cartographic quality of a map regarding a given reference map and considering semantic rules of association, differentiation and order supposed to be conveyed by the colors of the map. A big stake of such optimization is to preserve the semiotic quality of maps. Particularly, colors used in the legend could be optimized regarding those constraints. The necessary adaptation of mapping applications generates new constraints which should be considered in addition to the traditional cartographic rules used to design maps. Will be integrated automatically through our platform. Our approach is illustrated by a tourism LBS case study and could be applied forĪny geographic domain where position, place name, semantic details and visual aspects’ (icon, texture, color, etc.) ambiguities In this paper, we had elaborated many reasoning algorithms and build/match extended geo-ontology framework for the integration Advanced LBS have to improve interoperability among them. Slightly different data/metadata for the same requested service. However, many geographic databases (GDBs) could offer On the users’ location, his contextual information and his profile. Since the development of Geographic Information Systems (GIS) and the increasing popularity of mobile devices, many standardizationīodies such as OGC (Open Geospatial Consortium) had proposed the implementation of Location Based Services (LBS) applications.įurthermore, map service providers started to use the correspondent devices for visualizing geographic data essentially based §4), nous nous appuyons sur ce système de couleurs de référence pour modéliser nos raisonnements. 8) qui s'appuie sur les variables visuelles de teinte et valeur et les contrastes entre teintes et entres valeurs (Buard & Ruas 2007) pour organiser une palette finie et cohérente de 156 couleurs. Chesneau (2006) a créé un cercle chromatique (représenté en fig. Brewer (2003) a proposé des palettes de couleurs adaptées à la traduction des relations entre les objets géographiques. Ils sont fondés sur les travaux antérieurs d'Itten (1985) qui a étudié les différents types de contrastes colorés. Des travaux ont été menés récemment sur la perception de la couleur et son utilisation dans les cartes. Traduction dans la légende des relations existant entre les objets cartographiés (Chesneau 2006) Notre objectif initial, aider un utilisateur à construire une légende correcte et adaptée à ses besoins, est alors reformulé de la manière suivante : associer une famille de couleurs à chaque thème de la légende.
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