Figure 3

Variation in length entropy with distance from the centre of the street network of Sheffield.
The circle in the centre, a, coincides with the oldest part of the network. (source: OS MasterMap ITN Layer [GML geospatial data], Coverage: UK, Ordnance Survey (GB), Using: EDINA Digimap Ordnance Survey Service, <http://edina.ac.uk/digimap>, Downloaded: September 2011). Map composed in ESRI ArcGIS 9.3.1.