University Libraries’ staff demonstrated how to visualize John Snow’s Cholera incidences that occurred in London 1854 in celebrating GIS Day 2015 at Mason. You can see the project through the interactive web mapping site: http://mason.gmu.edu/~aaburiza/snowCholeraMap/
We used three different methods to visualize the data to show a relationship between the death locations and the nearest water pump as following:
1) Creating a Spiderweb map-when you click on a water pump, all web lines associated with the death locations to the closest water pump; when you click on a pump, the spider web of the deaths for the clicked pump is also generated. In addition, when you click on a death incident, a line links to the closest pump. 2) Creating a Veronoi diagram map-a zone of each water pump is drawn such that all water pump are closer to one other. The death locations falling in each zone are then calculated to represent density of a thematic map, and 3) Generating a heat map to show hot spots of the death incidences.
Please click on each menu bar: Spiderweb, Veronoi, and Heatmap to enjoy the interactive web mappings of this project.
The system was built using Leaflet, Mapbox, and Turf.js in addition to Bootstrap, JQuery and HTML for the web design.