Theoretical models have long shown that spillovers from knowledge investments are of great economic importance to sustained economic growth and innovation and that these spillovers may be facilitated by physical and technological proximity. However, such localized spillovers have not been identified using data from developing countries. In this paper, we use a general measure of knowledge and a...

This paper identifies the main sources of urban increasing returns, after Marshall. The geographical distance across which externalities flow is also examined. We bring to bear on these questions plant-level data organized in the form of a panel across the years 1989 and 1999. Plant-level production functions are estimated across the Canadian manufacturing sector as a whole and for five broad i...

The user interfaces of most geographical information systems are project specific, imposing upon the user a particular organisation's view of the information content. As geographical information becomes more widely available across multiple domains, the requirement arises to provide information retrieval facilities that recognise geographical terminology from multiple perspectives at multiple l...

Geographical data plays an important role on the Web: recent search engine statistics regularly confirm that a growing number of search queries have a locale context or contain terms referring to locations. Assessing geographical relevance for Web pages and text documents requires information extraction techniques for recognizing and disambiguating geographical entities from unstructured text. ...

This paper outlines the principle features of a Ph.D. programme of work. Section one describes the aims of the research. Section two looks at the nature of digital maps and their importance in the broader context of geographic information. Section three looks at the two major aspects of the research. Section four discusses the role of category theory in the research. Finally the conclusion is p...

Combined research in the fields of Geographical Information Systems (GIS) and maritime systems has finally reached the point where paths should overlap and continue in better unison. This paper introduces methodological and experimental results of several marinerelated GIS projects whose objectives are to develop spatial data models and computing architectures that favour the development of mon...

If there exists a mismatch between the way people use prepositional phrases and a computer embedded algorithm that handles those phrases, users cannot get proper results for their queries. This causes serious problems in decision making processes. In this paper, such problems are discussed for the case of Geographical Information Systems (GISs). In order to obtain human subjective cognition of ...

Because of the expansion of geo-positioning tools and the democratization of geographical information, the amount of geo-localized data that is available around the world keeps increasing. So, the ability to efficiently retrieve informations in function of their geographical facet is an important issue. In addition to individual properties such as position and shape, spatial relations between o...

Decision analysis can be defined as a set of systematic procedures for analysing complex decision problems. Differences between the desired and the actual state of real world geographical system is a spatial decision problem, which can be approached systematically by means of multi-criteria decision making. Many real-world spatially related problems give rise to geographical information system ...

Geographical Information Systems (GIS) have long bridged the gap between geo-information databases and applications. Although conceptual modelling approaches for GIS have been particularly successful in the representation of the specific properties of geographical information, there is still a need for a better integration of user intentions and usage. This paper introduces a conceptual framewo...