What is Thematic map?
[[File:Injury Mortality Rate, 2008.png|thumb|right|280px|A thematic map]] [[File:Snow-cholera-map-1.jpg|thumb|right|280px|[[John Snow]]'s cholera map about the cholera deaths in London in the 1840s, published 1854]] A '''thematic map''' is a kind of [[map]]. Different from normal maps, a thematic map is designed to show the distribution of human or natural features or [[data]]. The information may or may not be related to geography.<ref>{{cite journal |last=Bartz Petchenik, Barbara 1979 |title=From place to space: the psychological achievement of thematic mapping |journal=Cartography and Geographic Information Science |volume=6 |issue=1 |pages=5–12 |url=http://www.ingentaconnect.com/content/cagis/cagis/1979/00000006/00000001/art00001}}</ref> For example, a map which shows [[population]] is a thematic map. Thematic maps are called so because they show features relating to a particular theme or aspect of geography. == Examples == An early contributor to thematic mapping in England was the English [[astronomer]] [[Edmond Halley]] (1656–1742).<ref name=Throw>Thrower, Norman J.W. 2008. ''Maps & civilization: cartography in culture and society''. 3rd ed, University of Chicago Press. [https://books.google.com/books?id=cGeCNa_vookC&pg=PA97 97] {{ISBN|978-0-226-79974-2}}</ref> His first important map was a [[star chart]] of the [[constellation]]s of the [[Southern Hemisphere]], published in 1686. In the same year he also published something new, a map of the globe (Earth) in an article about [[trade wind]]s. This map is sometimes called the first [[weather map]].<ref name=Throw/> Another example of early thematic mapping comes from London physician [[John Snow]]. Snow’s cholera map of 1854 is the best known example of using thematic maps for analysis of data. His method [[wikt:anticipation|anticipates]] the principles of a geographic information system ([[GIS]]). He started with an accurate map of a [[London]] neighborhood which included streets and [[water pump]] locations. Onto this Snow placed a dot for each [[ch