This zip file contains a number of GIS layers relating to John Snow's 1854 investigation of a Cholera outbreak in London - considered by many to be the first use of geographical analysis in an epidemiological study. More details on the history are available at http://en.wikipedia.org/wiki/1854_Broad_Street_cholera_outbreak
This file contains a number of GIS layers created from Snow's original map which allow analyses to be conducted on the data in modern GIS systems. For example, clustering of cases can be analysed and the effect of spatial aggregation in modern anonymised health data releases. Of course, it's also just interesting to look at the area, and how little it has changed since 1854.
Files included: (Many of the items in the list consist of many actual files (for example .shp, .dbf etc)
- OSMap Raster Modern OS map of the area of the outbreak (from OS Open Data - contains Ordnance Survey data © Crown copyright and database right 2013)
- OSMap_Greyscale Raster Same as above, but in greyscale for easier visualisation (altered by conversion to greyscale, from OS Open Data - contains Ordnance Survey data © Crown copyright and database right 2013)
- SnowMap Raster Snow's original map, georeferenced and warped so that it accurately overlays the OS map
- CholeraDeaths Vector Points for each location of one or more deaths. Attribute value gives number of deaths at that location
- Pumps Vector Points for each location of a pump
Created and compiled by Robin Wilson ([email protected], www.rtwilson.com/academic) - Jan 2011.