unmarked: sight2perpdist – R documentation

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sight2perpdist

Convert sight distance and sight angle to perpendicular distance.

Description

When distance data are collected on line transects using sight distances and sight angles, they need to be converted to perpendicular distances before analysis.

Usage

sight2perpdist(sightdist, sightangle)

Arguments

`sightdist`	Distance from observer
`sightangle`	Angle from center line. In degrees between 0 and 180.

Value

Perpendicular distance

Examples

round(sight2perpdist(10, c(0, 45, 90, 135, 180)))

unmarked

Models for Data from Unmarked Animals

v1.1.0

GPL (>= 3)

Authors

Richard Chandler [aut], Ken Kellner [aut], Ian Fiske [aut], David Miller [aut], Andy Royle [cre, aut], Jeff Hostetler [aut], Rebecca Hutchinson [aut], Adam Smith [aut], Marc Kery [ctb], Mike Meredith [ctb], Auriel Fournier [ctb], Ariel Muldoon [ctb], Chris Baker [ctb]

Initial release

2021-05-05