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The original Naismith 's rule from 1892 says that one should allow one hour per three miles on the map and an additional hour per 2000 feet of ascent. [1][4] It is included in the last sentence of his report from a trip. [1][8] Today it is formulated in many ways. Naismith's 1 h / 3 mi + 1 h / 2000 ft can be replaced by:
If the distance measure is a metric (and thus symmetric), the problem becomes APX-complete, [53] and the algorithm of Christofides and Serdyukov approximates it within 1.5. [54] [55] [10] If the distances are restricted to 1 and 2 (but still are a metric), then the approximation ratio becomes 8/7. [56]
A ten-minute walk is considered to be one-half-mile (0.80 km), which is the distance the National Park Service (NPS) and the Centers for Disease Control and Prevention (CDC) uses when they link park access and public health. [16] The first city in the U.S. to achieve a 10-Minute Walk to a park for every resident was San Francisco. [17][18]
There is no formal definition of a long-distance path, though the British Long Distance Walkers Association defines one as a route "20 miles [32 km] or more in length and mainly off-road." [1] They usually follow existing rights of way, often over private land, joined together and sometimes waymarked to make a named route. [3]
This is a list of notable long-distance trails in the United States, with a minimum length of 30 miles (48 km). Linear path traveling through the Appalachian and Allegheny Mountains. Loop trail in Moshannon State Forest. Passes through Delaware, Maryland, West Virginia, Ohio, Kentucky (Southern Route), Indiana, Illinois, Iowa (Northern Route ...
The walking distance measure denotes the distance that can be travelled by walking in a fixed amount of time. In Japan, the standard measure for walking distance is 80 meters for 1 minute of walking time. It is the standard used in real estate listings. For example, if a building is a 10-minute walk from a particular park or train station, it ...
Walkability. In urban planning, walkability is the accessibility of amenities by foot. [ 1 ] It is based on the idea that urban spaces should be more than just transport corridors designed for maximum vehicle throughput. Instead, it should be relatively complete livable spaces that serve a variety of uses, users, and transportation modes and ...
Shortest path (A, C, E, D, F) between vertices A and F in the weighted directed graph. In graph theory, the shortest path problem is the problem of finding a path between two vertices (or nodes) in a graph such that the sum of the weights of its constituent edges is minimized.
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