Accessibility as a measure of distance in transport model - distance = seconds, not meters

Mapping is almost always done with distances, but mapping areas based on travel time between them can be much more valuable information.
Results of modeling are usually given in flows, travel times over network elements, or heat maps. But sometimes it'd be nice to show different dimension.
Belowe we can see Małopolska Region in Poland, but from three differen perspectives. First is normal map in euclidean space. But then we see completely different view on the same area. Distance from towns to the capital - Cracow, is proportional to travel time in Public Transport. 3rd picture shows the same but for three regional capitals competing with each other.

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It was done with simple mathematical operations based on PTV Visum data model with elementar python script. Script simply loops over each zone and each skim matrix Value of Perceived Journey Time. Contact me at info@intelligent-infrastructure.eu to receive free support with such a script.