Source- http://www.personal.psu.edu/faculty/c/a/cab38/GEOG321/14_multivariate02/22_arrows.jpg
http://www.personal.psu.edu/faculty/c/a/cab38/GEOG321/14_multivariate02/multivariate.html
Flow maps are used expresses movement through lines. This flow map above shows the movement of people from Ireland, England and Scotland going to Europe. The lines have little arrows within them to show which way the population is moving. Around 316,000 people moved to Europe and only 12,100 people were going to Ireland, England, and Scotland.
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