sight2perpdist {unmarked} | R Documentation |
When distance data are collected on line transects using sight distances and sight angles, they need to be converted to perpendicular distances before analysis.
sight2perpdist(sightdist, sightangle)
sightdist |
Distance from observer |
sightangle |
Angle from center line. In degrees between 0 and 180. |
Perpendicular distance
round(sight2perpdist(10, c(0, 45, 90, 135, 180)))