Isodistances can be used to calculate bands of walking or travel times. The word is a concatenation of iso, from the Greek word isos which means ‘equal’ and distance. Isodistances represent the calculation of specific distance intervals from one point extending out along every possible route. In these maps, the outer edges of each polygon represents the isoline). Instead, isodistance and isochrone calculations are used to show bands of equal distances and travel times from a specific point respectively (typically represented as polygons although the calculations are actually performed along routes, i.e. Likewise, the uniform distance or travel time from a particular point (say five miles from Point A in any direction) can rarely be measure by a circular buffer zone. When traveling across a landscape, the shortest point from A to B is rarely “as the crow flies” due to barriers or twists and turns in the route.
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