Method evidence record

Isochrone Analysis

Isochrone analysis computes the area reachable from a location within a given travel time, drawing contour lines — isochrones — that enclose everywhere you can get to in, say, 15, 30, or 45 minutes. It rests on the single-source shortest-path problem solved by Dijkstra's 1959 algorithm: from an origin, the travel time to every node of a routable network is found, thresholded, and converted into a polygon of reachable space. Isochrones turn an abstract travel-time field into an intuitive map of reach, and underpin service-area planning, accessibility measurement, and location analysis.

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Isochrone Analysis (Travel-Time Contour Computation)

Taxonomic method record · process-pipeline / human-geography

Dijkstra, E. W. (1959). A note on two problems in connexion with graphs. Numerische Mathematik, 1(1), 269–271. · DOI 10.1007/BF01386390

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Related methods

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Same method familyAccessibility Analysismachine-suggested · Relational suggestion, not evidence.Same method familyCatchment Area Analysismachine-suggested · Relational suggestion, not evidence.Same method familyNetwork Distance Analysismachine-suggested · Relational suggestion, not evidence.Same method familyTwo-Step Floating Catchment Areamachine-suggested · Relational suggestion, not evidence.