Hard Sums
 

If you dont mind a few hard sums, this might be worth a look, if you
like thinking about roads as networks ...

http://arxiv.org/abs/1311.7284

Exploring the Evolution of London's Street Network in the Information Space: a Dual Approach

A. Paolo Masucci, Kiril Stanilov, Michael Batty

We study the growth of London's street-network in its dual representation, as the city has evolved over the last 224 years. The dual representation of a planar graph is a content-based network, where each node is a set of edges of the planar graph, and represents a transportation unit in the so-called information space, i.e. the space where information is handled in order to navigate through the city. First, we discuss a novel hybrid technique to extract dual graphs from planar graphs, called the hierarchical intersection continuity negotiation principle. Then we show that the growth of the network can be analytically described by logistic laws and that the topological properties of the network are governed by robust lognormal distributions characterising the network's connectivity and small-world properties that are consistent over time. Moreover, we find that the double-Pareto-like distributions for the connectivity emerge for major roads and can be modelled via a stochastic content-based network model using simple space filling principles.

Hard Sums
 

On 06/12/2013 16:41, wrote:

http://arxiv.org/abs/1311.7284

First, we discuss a novel hybrid technique to extract dual
graphs from planar graphs, called the hierarchical intersection
continuity negotiation principle. Then we show that the growth of the
network can be analytically described by logistic laws and that the
topological properties of the network are governed by robust
lognormal distributions characterising the network's connectivity and
small-world properties that are consistent over time. Moreover, we
find that the double-Pareto-like distributions for the connectivity
emerge for major roads and can be modelled via a stochastic
content-based network model using simple space filling principles.

Isn't that just a slightly simplified explanation of how to use Oyster
to interchange at Wimbledon?


--
Arthur Figgis Surrey, UK