Amend, augment and aid the analysis of John Snow's cholera map.
Features:
Fixes three apparent coding errors in Dodson and Tobler's 1992 digitization of Snow's map.
"Unstacks" the data in two ways to improve analysis and visualization.
Computes and visualizes pump neighborhoods based on Euclidean (Voronoi tessellation) and walking distance.
Ability to overlay graphical features like kernel density, Voronoi diagrams, and landmarks (the plague pit, the Lion Brewery, etc.).
Includes a variety of helper functions to find and locate cases, roads, pumps and walking paths.
Appends actual street names to roads data.
Includes the revised pump data used in the second version of Snow's map from the Vestry report. This includes the "correct" location of the Broad Street pump.
Adds two different aggregate time series fatalities data sets, taken from the Vestry report.
Computes and visualizes two types of "pump neighborhoods": Voronoi (based on Euclidean distance) and walking (based on computed walking distances).
To learn more, start with the vignettes:
vignette("duplicate.missing.cases")
vignette("unstacking.bars")
vignette("pump.neighborhoods")
vignette("roads")
vignette("time.series")
vignette("kernel.density")