Robin's Blog

Updated Snow GIS data

A while back I released a GIS dataset containing Snow’s Cholera analysis data in modern GIS formats, and georeferenced to the British National Grid (see my previous post). Unfortunately, there was an error in some of the attributes of the Cholera Deaths shapefile which caused issues when using the data.

This error has now been fixed, and the updated data are available to download here: SnowGIS_v2.zip. The link on the previous post has also been updated.

Please accept my apologies for this error.


Categorised as: Academic, GIS


7 Comments

  1. Jacob says:

    joke theoretical question: how would the errors have impacted the epidemic?

  2. Robin Wilson says:

    Interesting question there Jacob! Somehow I had managed to set some of the death locations as having zero deaths (no idea how). In terms of any analysis performed on the data, there would be a ‘hole’ in the data with no deaths, which would definitely look unusual and probably cause significant differences in any statistics plotted. At the very least, seeing a big area with no deaths should lead to some investigation as to why there were no deaths – which would hopefully have turned up my error…

    As for the effect on the epidemic itself – if there were less deaths then I guess a lot of people would have been a lot happier!

  3. Andrew says:

    Hey Robin! This is such a great dataset, and I’ve used it to give a few mapping demos etc. I was just building a tutorial from your new data and ran into the death count update you made. I had always assumed that the 0s were from the Brewery workers that weren’t taking water from the community well? Is that wrong?

  4. Andrew says:

    On looking at the original maps again, I must have just been wrong. Oh well!

  5. [...] because one dataset is never enough, I downloaded a version of John Snow’s cholera data that Robin Wilson digitized from the original maps. Same procedure here, except color indicates the number of deaths at each [...]

  6. [...] save you reading my previous blog posts on the subject, I’ll give a brief overview of my data. John Snow produced a famous map in [...]

  7. [...] suggest you read the blog post about the data. Next, download the updated dataset over here and unzip the [...]

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