Isochrone map

Isochrone map of the Austro-Hungarian Empire, in 1912. The railway lines are clearly visible.
Isochrone map showing drive times around airports in northern Finland, created using GIS software (2011)

An isochrone map in geography and urban planning is a map that depicts the area accessible from a point within a certain time threshold. An isochrone (iso = equal, chrone = time) is defined as "a line drawn on a map connecting points at which something occurs or arrives at the same time". In hydrology and transportation planning isochrone maps are commonly used to depict areas of equal travel time. The term is also used in cardiology as a tool to visually detect abnormalities using body surface distribution.

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