Dynamic segmentation is a two-step process performed on a spatial data set comprised of linear features. First, a route system is created by associating adjacent line segments into one or more groups that have a definite linear sequence. Second, descriptive information is associated with the route system by referencing distances from the starting point of each route. For example, a stream route system is created by grouping stream segments into routes that represent the mainstem, tributaries, and headwater reaches. Spawning habitat areas are then mapped by their locations along the routes.
The advantage of using dynamic segmentation is that small areas along a line feature can be referenced without actually breaking the line into pieces. Also, linear distances, such as river miles, can then be calculated directly from the routes and associated attributes.