is something moved?" This is often shown by arrows.
* Flow velocity: "At what speed or in how much time is something moved?" This is a ratio variable that is similar to, but distinct from the amount of movement. An example would be representing highway traffic levels using mean vehicle speed, or wind velocity.

These are not distinct types of maps; a flow map may portray any of all of these aspects simultaneously.

The types of phenomena that have been the subject of flow maps are varied. Topics relating to human geography

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