Data aggregation in Geographic Information Systems (GIS) is a desirable feature, only marginally present in commercial systems nowadays, mostly through ad-hoc solutions. Moreover, little attention has been given to the problem of integrating GIS and OLAP (On Line Analytical Processing) applications. In this paper, we first present a formal model for representing spatial data. This model integra...

This article applies a technology-organization-environment framework to evaluate the determinants of the global information systems (GIS) strategies of foreign affiliates. The results indicate that IT maturity, parent resource dependency, cultural distance, restrictive regulations, and local competition are significant determinants of GIS strategy. We also find that the integration-responsivene...

As information and telecommunication technologies developing rapidly, education courses in communications also meet many challenges. Relying heavily on mathematical models, communications theory looks to be completely abstract for students. Showing how the theory applies to real world systems would be very important in teaching communication technologies. For this purpose, in this paper we show...

The OpenStreetMap (OSM) geographic data model has three principal object types: nodes (points), ways (polygons and polylines), and relations (logical grouping of all three object types to express real-world geographical relationships). While there has been very significant analysis of OSM over the past decade or so, very little research attention has been given to OSM relations. In this paper, ...

Geographic Information Systems (GIS) are a special case of information systems with a capability to integrate spatial and descriptive data. As GIS enter into mainstream business applications, understanding how they are similar and different from more familiar information systems such as DSS can be usefil. An attempt is made to converge on a definition of GIS. The potential for many decisions to...

Distributed physical models for the space-time distribution of water, energy, vegetation, and mass flow require new strategies for data representation, model domain decomposition, a-priori parameterization, and visualization. The Geographic Information System (GIS) has been traditionally used to accomplish these data management functionalities in hydrologic applications. However, the interactio...

Urbanization compromises the biotic integrity and health of streams, and indicators of integrity loss are needed to improve assessment programs and identify mechanisms of urban effects. We investigated linkages between landscapes and assemblages in 31 wadeable Piedmont streams in the Etowah River basin in northern Georgia (USA). Our objectives were to identify the indicators of macroinvertebrat...

In this paper, a generic model for locating sellers in a geographical area is presented. The proposed model is based on buyers’ side attributes including price, quality, distance, income and discount, which determine the location of the prospective sellers. The required information for the model is acquired from buyers and the geographic information system (GIS). It is assumed that the agents (...

An epistemological and discursive divide separates critics of GIS and its researchers. An assumption exists among many users and developers of GIS that the technology models reality and can thus be used to predict and explain spatial processes. This realist position is not sanctioned by social science critics of GIS who have focused efforts on illustrating the social effects of technology as we...

Research on temporal textures has concerned mainly modeling, synthesis and detection, but not finding changes between different temporal textures. Shot change detection, based on appearance, has received much research attention, but detection of changes between temporal textures has not been addressed sufficiently. Successive temporal textures in a video often have a similar appearance but diff...