Accurately representing geographic space in a digital environment continues to confound and challenge researchers. Carrying out spatial analysis in a setting where geographic representation is subject to change poses problems to be addressed. In this paper we examine spatial representation in the context of coverage-based location modeling. A geographic region can be represented in a variety of...

With the explosive growth of the available information on the internet, navigating the web successfully in order to obtain the desired information has become an important issue. This essentially involves using techniques such as searching for the desired information using keyword searches and subject based searches, among other techniques. To the best of our knowledge, most tools which achieve ...

Geographic routing uses the physical locations of devices for routing purposes instead of the conventional routing protocols which make use of logical addressing schemes representing an abstract hierarchy. Greedy geographic routing is a popular method favoured for its efficiency and its simplicity that considers only one hop neighbours. Greedy routing needs only minimal network information and ...

Many mobile applications require some knowledge about the current geographic locations of the mobile objects involved. Therefore, services exist that can store and retrieve the position of mobile objects in an efficient and scalable way. More advanced location-aware applications, however, require additional functionality, like determining all mobile objects inside a certain geographic area (ran...

The Grid Location Service (GLS) is a location service which provides location information for a node in a mobile ad hoc network. GLS provides a mechanism for a node to track the location of other nodes in the network topology. A mobile ad hoc network (MANET) is an autonomous system of mobile routers (and associated hosts) connected by wireless links–the union of which form an arbitrary graph. T...

Subscribers in future personal communications system (PCS) networks will be assigned portable personal numbers, or non-geographic phone numbers (NGPNs), which will not indicate the service provider and home location register (HLR) database which serves the subscribers. A location management scheme for future PCSs based on a three-level hierarchical database architecture, which consists of a dir...

A whole new class of location-aware services may be envisaged by the deployment of a geographic location service for Internet hosts. We focus on a technique that relies on delay measurements and the exploitation of a possible correlation between geographic distance and network delay. Our investigation shows that such a correlation becomes stronger as connectivity becomes richer. Host locations ...

Location-aware applications take into account from where the users are accessing and thereby can offer novel functionalities in the Internet. This paper focuses on improving the accuracy of a geographic location service that relies on delay measurements to locate Internet hosts. Host locations are inferred by comparing delay patterns of geographically distributed landmarks, which are hosts with...