Martin Dodge Martin is a lecturer at Department of Geography.		Muki Haklay Muki is a lecturer at Department of Geomatic Engineering.
	Simon Doyle Simon is a Technical Specialist with Cadcorp. He was previously a researcher at CASA.		Sanjay Rana Sanjay is a PhD student in surface network modelling at CASA.
Authors wish to thank Bill Thoen, for his valuable comments.
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