On 29 Oct, 11:04, "Clive D. W. Feather" cl...@on-the-
train.demon.co.uk wrote:
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.

I actually did a map like this on Friday:
http://londonconnections.blogspot.co...ndon-gaps.html

I loaded all the station locations into a MySQL database, then wrote a
PHP script to generate an SVG file. I didn't bother calculating
distances - it just does separate passes to make the quarter mile
discs appear on top of the half mile discs, which achieves a similar
effect.

U

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http://londonconnections.blogspot.com/
A blog about transport projects in London