Location-Based Services (LBSs) stands for the provision of information about the position of a device or a user, often offered as a service via various means of media. The position can be combined with spatial information so as to integrate an LBS system with Geographical Information Systems (GISs) or other location dependent information. The quality of the services provided by the LBSs depends...

Improved estimates of the radiative forcing from tropospheric ozone increases since the preindustrial have been calculated with the tropospheric chemistry model used at the Goddard Institute for Space Studies (GISS) within the GISS general circulation model (GCM). The chemistry in this model has been expanded to include simplified representations of peroxyacetylnitrates and non-methane hydrocar...

Spatial relations are the basis for many selections users perform when they query geographic information systems (GISs). Although such query languages use natural-language-like terms, the formal definitions of those spatial relations rarely reflect the same meaning people would apply when they communicate among each other. To bridge the gap between computational models for spatial relations and...

muchhistorical scholarshipwasof anarrative form and that the recent availability of mapping techniques allows the development of a geographic or spatial aspect to the discipline. The book comprises an introductory paper followed by nine essays which are presented either as a pure casestudy or as a methodological perspective on the topic. The five case-studies are concerned with mapping of ancie...

Simulation of a dynamic and continuous phenomenon (field) is a difficult task for GISs as their data structures are 2D and static and are not well-adapted to manage neither the dynamic behavior of the phenomenon nor its geometrical and topological information. In this paper we present the Voronoi diagram as an alternative data structure that, through its useful geometrical and topological prope...

?‘lie paper presents an artificial neural network(ANN) approach using ARTS(Adaptive Resonance Theory 2) to a diagnostic system for a Gas Insulated Switchgear(G1S). To begin with, we will show the background of abnormality diagnosis of GISs from the view point of predictive maintenance of them. Then, we will discuss the necessity of ART-t,ype ANNs, as an unsupervised learning method, in which ne...