Hi, a research team at George Mason University has been doing some interesting analysis of the geography of networked infrastructure like telephones, gas and internet in the US. They have also produced a range of cool 3d surface visualizations. Check out the Infrastructure Mapping Project at http://policy.gmu.edu/imp/ Sean Gorman is one of the key researchers involved. cheers martin _________________________________________________________________________ martin dodge cyber geography research centre for advanced spatial analysis, university college london gower street, london, wc1e 6bt, united kingdom email: [log in to unmask] (remove the nospam bit) http://www.casa.ucl.ac.uk http://www.cybergeography.org __________________________________________________________________________