Basil Jet wrote on 13 Jan 2016 at 19:28 ...
On 2016\01\13 19:07, Hils wrote:
On 13/01/16 18:25, Sam Wilson wrote:
In article ,
Basil Jet wrote:

On 2016\01\13 15:30, Martin Coffee wrote:
On 13/01/16 15:10, Basil Jet wrote:

I haven't seen this before. The key is incomplete and doesn't work, but
the map itself is still useful.

http://www.merrittcartographic.co.uk..._railways.html

It seems to be working for me.

I don't get any colours alongside the operator names, but that's no
biggy. The lack of any clue what the blob sizes mean is my main beef.

I'm using Safari on a Mac.

I'm also using a Mac. The Information panel tells you what the blob
size means (though without quantifying it) - "The symbols used to
represent stations on this map are shown at a size proportional to the
total number of entries and exits for 2013-2014 (using a logarithmic
scale)."

A linear scale would be a useful option.

I think blob radius should be proportional to the cube root of the
passenger number, as if the blob is a sphere. This would give a 50
million station 10 times the width of a 50 thousand one.

That is a neat mathematical concept, but it doesn't work in practice.
If Achnasheen (3972 entries and exits) had a blob 1mm in diameter, then
London Waterloo (98,442,742) would have to be 29mm in diameter, and all
the south London termini would merge into a huge blob.

Using log is bizarre and inappropriate.

Using logarithms to illustrate the differences in scale of a very widely
dispersed series is a well-known graphical technique, and it's entirely
appropriate here. Using your cube-root idea would seriously degrade the
legibility of the map in London and other urban centres.

--
Richard J.
(to email me, swap 'uk' and 'yon' in address)