Elevation data of every 1mof horizontal distance were obtained.
The difference between two adjacent points determined the slope,
and the slope value was classified into one of the eight categories
based on the slope classification scheme by Taiwan’s Council of
Agriculture (Table 1). The terrain that has a slope value less than
5% is regarded as flat (Level 1), and a slope value more than 30%
is regarded as hill (Level 6). Most trail slopes in the study area fall