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Description Snow-cholera-map-1.jpg. Original map made by John Snow in 1854. Cholera cases are highlighted in black, showing the clusters of cholera cases (indicated by stacked rectangles) in the London epidemic of 1854. The map was created in order to better understand the pattern of cholera spread in the 1854 Broad Street cholera outbreak ...
John Snow (15 March 1813 – 16 June 1858 [1]) was an English physician and a leader in the development of anaesthesia and medical hygiene.He is considered one of the founders of modern epidemiology and early germ theory, in part because of his work in tracing the source of a cholera outbreak in London's Soho, which he identified as a particular public water pump.
616. The Broad Street cholera outbreak (or Golden Square outbreak) was a severe outbreak of cholera that occurred in 1854 near Broad Street (now Broadwick Street) in Soho, London, England, and occurred during the 1846–1860 cholera pandemic happening worldwide. This outbreak, which killed 616 people, is best known for the physician John Snow ...
Dot distribution map. A bivariate dot density map showing the relative concentrations of the Black and Hispanic populations in the United States in 2010. A dot distribution map (or a dot density map or simply a dot map) is a type of thematic map that uses a point symbol to visualize the geographic distribution of a large number of related ...
A dot distribution map places small point symbols over a given space to indicate the distribution of a given phenomenon. The location of each dot may represent the actual location of a single instance, as in the map made by Dr. Snow during the 1854 Broad Street cholera outbreak, where each dot
The region of the Beagle Channel, explored by Robert FitzRoy in the 1830s, was one of the last to be colonized by Chile and Argentina. The cold weather, the long distances from other inhabited regions, and the shortage of transport and subsistence, kept it far from the governmental task. In the maps exhibited in this page it is possible to ...
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The geography of Chile is extremely diverse, as the country extends from a latitude of 17° South to Cape Horn at 56° and from the Pacific Ocean in the west to the Andes in the east. Chile is situated in southern South America, bordering the South Pacific Ocean and a small part of the South Atlantic Ocean. Chile's territorial shape is ...