Time intervals are conventionally represented as linear segments in a one-dimensional space. An alternative representation of time intervals is the triangular model (TM), which represents time intervals as points in a two-dimensional space. In this paper, the use of TM in visualising and analysing time intervals is investigated. Not only does this model offer a compact visualisation of the dist...

Recently, the demands on information services have been increasing significantly. This is mainly due to the popularization of computer and mobile telecommunication devices and the rapid improvements on wireless communication technology. Specially, information services and their corresponding management for mobile devices, such as Location Based Service (LBS) and Telematics, become more and more...

The relationship between geography and cancer incidence and treatment is a critical area of health outcomes research. Geographical information systems (GIS) are software packages designed to store and analyze data related to geographic locations. Although more commonly associated with the social sciences and urban planning, the use of GIS software in medical research has been increasing. Moreov...

To improve the spatial retrieving by means of Geographical Information Systems (GIS), a distributed GIS-Application has been designed. This application is mainly focused on making spatial analysis, throughout Spatial Analyzer Module (SAM). SAM contains several spatial and mathematical models that have been designed and implemented for detecting landslides and flooding areas. Users can make an a...

This paper reports “first cut” of the design of a distributed and object oriented geographic information system, DO-GIS, under development at I.I.T. Delhi. The paper deals with data model, architecture, query processing and data management in a GIS. Considering that geographical data includes information about spatial reference frame, topological connections and requires maintenance of physical...

This paper describes the use of data from a Geographical Information System (GIS) as a priori knowledge to be exploited for reliable and consistent vehicle positioning. The line-of-sight approach taken by GPS creates location inaccuracies especially in urban areas, or leads to complete signal loss when underground, in tunnels, etc. Many attempts have been made to complement GPS with dead reckon...

At first glance, the domain of health is no typical area to applicate Geographical Information Systems (GIS). Nevertheless, the recent development clearly shows that also within the domains of environmental health, disease ecology and public health GIS have become an indispensable tool for processing, analysing and visualising spatial data. In the field of geographical epidemiology, GIS are use...

In this article, we present and describe current ideas in Virtual Reality Modeling Language (VRML) technology such as focused mostly on integrating VRML with other technologies Geographical Information System (GIS) and Global Positioning System (GPS) applied as new Internet services called Virtual World Webcasting (VWW). The VWW technology is considered a new web communication paradigm, definin...

The notion of hypermap emerged as a response to the need for adding to geographical information systems (GIS) the linking and semantics capabilities of hypermedia. A hypermap is a new and powerful instrument for thematic cartography and spatial analysis in GIS. It extends the ability of a GIS to represent, store, manipulate, and display digital maps with the associative linking and interactive ...