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1838 map of pre-railroad cargo traffic in Ireland, one of the first thematic maps to use proportional symbols. The earliest known map to visually represent the volume of flow were two maps by engineer Henry Drury Harness, published in 1838 as part of a report on the potential for railroad construction in Ireland, showing the quantity of cargo traffic by road and canal.
It is a flow map, overlaying a Sankey diagram onto a geographical map. It was created in 1869, predating Sankey's first Sankey diagram of 1898. Minard had used this form of diagram for visualising flow of goods and transport of people from at least since 1844. [6]
Flow map depicting US aid to Africa in 2016. Source: USAID. Flow maps are maps that use line symbols to portray movement or relationship between two or more places, such as air travel, monetary aid, or economic trade. The lines may be schematic straight lines or curves, or may represent the actual travel route.
Minard created his "revolutionary" [2]: 40 first flow map in 1845 to inform the discussion about routing the rail line in the area between Dijon and Mulhouse. The map shows traffic on the pre-existing roads in the area. Two hundred copies of it were distributed to various stakeholders, and it dominated the debate among the deputies and engineers.
The physical movement of objects from one location to another can also be visualized in a mix of maps and flowchart or sankey diagram, which are called flow maps. Flow maps can indicate on a map, what flows, moves or migrates, in which direction, and in which quantities etc. [5]
A process flow diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations.
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