sations can save a huge amount of money. The most successful companies in the utility and infrastructure business use GIS to integrate geospatial with other corporate data to take maximum advantage of its resources (ESRI, 2002). There is, however, often little collaboration between organisations despite similarities of interest. This is mainly because of issues of data sharing and interoperability. These issues have concerned the geospatial spatial (GI) community for many years. Several organisations have presented a number of standards and specifications that attempt to persuade users to implement their system using the same standards or specifications. One such organisation is the Open GIS Consortium (OGC) which has developed and put forward a number of specifications and standards, aimed at promoting data sharing and dissemination amongst the GI community. Increasingly OGC specifications are being adopted and implemented by GI technology vendors and users to provide solutions to the problems of web based GI dissemination. In particular; the Geographic Markup Language (GML) (OGC, 2003) and web map services (e.g. Web Map Server (WMS) (OGC, 2001), Web Feature Server (WFS) (OGC, 2002)) looks set to play an increasingly crucial role in the future distribution of GI and services. The basic operation of requesting and retrieving data are performed via Uniform Resource Locators (URLs) and uses the Common Gateway Interface (CGI) protocol to pass the request details.
This paper reports the development of an expert system that is capable of combining linear network datasets from different data sources and carrying out network analysis taking advantage of existing standards, protocols and technologies. This system involves many various implementations and technologies. This research uses the London train network (including rail, tube and tram) for a case study to test such a system.
2. The London train network The London train n
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