For what it's worth, I recall looking closely at the London underground map
for the first time and thinking immediately how it looked like a piping
layout. Kind of makes sense - tubes, pipes, it's all a bit the same....
About the cartograms - they're good for spotting overall trends only, or
coarse comparisons. That's how I've thought of them anyways.
Cheers.
Fil
On 20 August 2010 22:39, Terence Love <[log in to unmask]> wrote:
> Hello,
>
> For those interested in a sewage map of London please see
> http://www.sewerhistory.org/images/bm/bmm3/1930_bmm315.jpg
>
> The two main map making conventions that transform this kind of map into
> Beck's underground map are:
>
> 1) Convert lines to 90 or 45 degrees
>
> 2) Locate items of interest approx equidistant
>
> The lack of good sewage maps online of this era in London suggests the
> connection with the underground may be an urban myth. There is a more
> obvious connection visually with engineering drawings of drainage systems
> in
> which major items are drawn topologically correct, arranged in an
> approximately sensible relationship and the pipe lengths between them are
> shortened to suit the drawing.
>
> In contrast to the topological map, the cartogram appears to be potentially
> useful in representing information well, See for example
> www.sasi.group.shef.ac.uk/publications/2006/dorling_new_
> <http://www.sasi.group.shef.ac.uk/publications/2006/dorling_new_maps.pdf>
> maps.pdf
>
> Seems a bit difficult to do easy comparisons of different items using the
> cartogram. Anyone else feel the same?
>
> Sewage technology has had a long and hidden history of input into design
> across a wide variety of design fields. For example, you can guess that
> there was considerable user (lead user!) input and collaborative design of
> this 'flusher's' uniform and equipment
> http://www.sewerhistory.org/images/cm/cmjs/1950_cmjs01.jpg
>
> Best wishes,
>
> Terry
>
--
Filippo A. Salustri, Ph.D., P.Eng.
Mechanical and Industrial Engineering
Ryerson University
350 Victoria St, Toronto, ON
M5B 2K3, Canada
Tel: 416/979-5000 ext 7749
Fax: 416/979-5265
Email: [log in to unmask]
http://deseng.ryerson.ca/~fil/
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