In message , Mark Brader
writes
Clive Feather:
When you've finished, the grid holds the distance to the nearest
station. Convert it to a GIF and fiddle with the colour map and, for
example, you can have a map where places within 1km of a station are
green, within 2km are yellow, and more than 2km are red.

With suitable travel-time assumptions, you can make an "isochronic map"
like this one, which I occasionally use as a screen background:


http://www.mysociety.org/2006/travel...london-big-117
7px.png

That, Mark, is seriously excellent!

(And could also get you at the very least a shortlisting for the Turner
Prize!)

In all seriousness, a *very* interesting exercise.
--
Ian Jelf, MITG
Birmingham, UK

Registered Blue Badge Tourist Guide for London and the Heart of England
http://www.bluebadge.demon.co.uk