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John Snow Cholera Map - data sources?

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#1
David Medeiros

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I'm looking for either a geo-referenced version of the John Snow cholera map or a possible source for an 1854 London map that could be used to reference the Snow map or data from the Snow map.

I've found this, but would rather work towards a real world representation of the data:
http://www.udel.edu/...a/cholera2.html

Any help is appreciated, thanks!

David

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#2
David Medeiros

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Well, I shouldn't have assumed this area would have changed all that much I guess. Looks like a reasonable fit can be made to modern data. The overlay to a Google Map of this area is fairly close.

I wonder if anyone here could hazard a guess as to how Snow would have made the map, what reference system would have been used for an 1854 city map of London?

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#3
ravells

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I'm sure that some of those questions were addressed by Tufte in one of his books - I think it's 'The visual display of quantitative information'. Unfortunately I gave my copy away so I can't check!

You might find the information here helpful: http://www.ph.ucla.e...th/mapmyth.html

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#4
David Medeiros

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I'm sure that some of those questions were addressed by Tufte in one of his books - I think it's 'The visual display of quantitative information'. Unfortunately I gave my copy away so I can't check!

You might find the information here helpful: http://www.ph.ucla.e...th/mapmyth.html


Thanks,

No, Tufte doesn't address any issues of reference systems or source material, only the design of the map. I have his books here. I also found the link you shared in my research, it is a good resource. The references section may help me find some of the other data I'm after (date of each death in Snow report). I was unaware of some of the controversies surrounding the Show map until I started looking for his data.

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#5
SaultDon

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I can't remember if there was a mention of a specific reference system, but in the BBC documentary: The Beauty of Maps, it goes over the first extensive surveys of London. This wasn't aired in North America originally so we missed out.

I think part 2 of that series goes over city maps. Maybe a start?

Maybe researching some of those surveyors (they had it rough...) would provide more information on their methods.

That documentary suggests that for a long period of time, Londons maps were made of the same reference system being that cartographers/surveyors rarely saw profit from their maps (until the colouring period I guess where one could make a career doing just that) because a majority of maps were 'copies' of previous maps; easily reproduced an no system to enforce copyrights or record them efficiently.

Have you also looked at what map he actually used? It was made by "C.F. Cheffins, Lith, Southampton Bdgs London" in 1854.
Attached File  js_src.PNG   68.87KB   21 downloads

That was published in Snow, John. On the Mode of Communication of Cholera, 2nd Ed, John Churchill, New Burlington Street, London, England, 1855.

I wonder what a call to the British Library in London would do? I wouldn't be surprised if they had a copy...

#6
ravells

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> I was unaware of some of the controversies surrounding the Show map until I started looking for his data.

Me too. It was an interesting read. Did you notice in that resource a 'John Snow Society' was mentioned? They have a webpage!: http://www.johnsnowsociety.org/

Might be worth dropping them a line?

I watched 'Beauty of Maps' but and the bit about John Snow's map would be too superficial for your needs, I think.

I live in London, so if you need anything from the British Library which requires a presence here (posting stuff, picking up stuff etc), I'll be happy to help you out!

Also what might be worth checking out is the library at the Guildhall.

Best

Ravs

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#7
radek

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You can download some data from ASDAR book website.




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