Sooner or after all online mapping platforms must survive used to recreate John Snow's 1854 point map of cholera deaths inwards London's Soho.
Snow plotted the deaths caused yesteryear cholera some Broad Street inwards Soho as well as the place of 11 H2O pumps used yesteryear the locals. The distribution of the dots helped Snow honor that cholera occurred virtually ofttimes alongside those who drank from the Broad Street H2O pump.
Snow's map helped to disprove the thus pop theory that diseases such every bit cholera as well as bubonic plague were air borne as well as spread yesteryear 'bad air'. These days John Snow's map seems to survive virtually used yesteryear neo-geographers to exam the capabilities of online mapping platforms.
This Esri map of John Snow's Map is a squeamish illustration of how John Snow's information tin post away survive used every bit information layers on a digital map. John Snow's Map uses an overlay of Snow's master map every bit i layer. The locations of the H2O pumps are available inwards some other layer as well as the locations of the recorded deaths has been added every bit soundless some other layer.
For expert mensurate the map's creator has too added a Flickr layer to the map thus that you lot tin post away persuasion photos of the John Snow pub, the Broad Street H2O meat as well as the John Snow plaque on Broad Street.
If you lot desire to exercise your ain version of John Snow's map thus you lot tin post away catch the information inwards a pose out of formats from Robin's Blog. Robin's Blog has geo-coded the locations of the H2O pumps as well as cholera deaths as well as provides options to download the information every bit raster files, KML files or inwards a Google Fusion Table.
