# Travel Boundary

Travel Boundary determines a drive or walk-time or distance boundary from a given point or location. This feature obtains polygons corresponding to an isochrone or isodistance calculation. An isochrone is a polygon or set of points representing an area that can be traversed in a network from a starting point in a given length of time. An isodistance is a polygon or set of points representing the area that is a certain distance from the starting point. The Travel Boundary operation takes a starting point, a unit (linear or time), one or more costs, and returns the resulting travel boundary in a shape of a polygon. Cost here refers to the length of time or distance to use in calculating an iso.

Following sections describe the input values and settings to obtain the desired polygon.