Buffer distances (in miles) extend from the perimeter of park or trail units. For trails, the buffer distance is effectively a radius. For example, a one-mile buffer on each side of a trail would mean a two-mile diameter path centered on the trail.
Example of two different buffer distances (dark grey, light grey) around a park polygon (green):
Example of two different buffer distances (dark grey, light grey) around a trail segment (green):
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