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In this paper,we study the definition of the results for GIS queries. They are based on a graphical representation. Such a representation may introduce some ambiguities depending on the class of queries. We study two different ambiguities due to the aggregate functions and the notion of homogeneity.

To satisfy transport infrastructure requirement in a country in consonance to its developmental pace, decisions must be based on more reliable, update, relevant, easily accessible and affordable information. Geographic information system for transportation has now emerged as the technology with considerable potential for achieving dramatic gains in efficiency and productivity for multitude of t...

Local search has become a hot topic recently in information retrieval research area. How to retrieve geographical information correctly and efficiently is a key challenge to location-based search services. In this paper, we present a GIR (geographical information retrieval) system which uses implicit locations to improve retrieval performance. Experimental results based on Geo-CLEF 2006 (a cros...

The paper starts by sketching the key modes of spatial data analysis (point pattern, continuous surface, areal/lattice), and how they fit into legacy GIS data models. Based on development work with the GRASS release 5 team (GRASS 5 is GPL), status is reported for using R in the analysis of sites (point) data and for raster data, as well as using R as an intermediate analytical environment for i...

introduction: for the understanding of the geopolitics of information, we need to use a geographical approach in the flows and processes of information. in this way, it is necessary that put the westphalian territorialism away and equipped by new approach called polycentrism to information and its geopolitics. it does not mean that we cannot analyze every thing according to territorial walls an...

Many information resources on the web are relevant primarily to limited geographical communities. For instance, web sites containing information on restaurants, theaters, and apartment rentals are relevant primarily to web users in geographical proximity to these locations. In contrast, other information resources are relevant to a broader geographical community. For instance, an on-line newspa...

Geographical context is required of many information retrieval tasks in which the target of the search may be documents, images or records which are referenced to geographical space only by means of place names. Often there may be an imprecise match between the query name and the names associated with candidate sources of information. There is a need therefore for geographical information retri...