Maps of cover type and roads are combined and reclassified for relative and absolute barriers to hiking. However, there are significant differences in the information produced and how it is used.
Network analysis produces exact results necessary for navigation between points.
Each approach generates valid and useful information within the context of an application. One shouldn't use a statistical travel-time map for routing an emergency vehicle. A hiking-time surface identifies the estimated time to hike from the ranch to any other location in the area. Let's assume you're a hiker and live at the ranch depicted in Figure 1. The Locations map positions the ranch and a nearby cabin.