DoubleObsRandom: Derive a random double observer sampling design

In USFWS/AKaerial: Analysis of Alaska Region Aerial Survey Data

Derive a random double observer sampling design

Description

DoubleObsRandom will load an existing stratified transect design and assign a third observer approximately equally by strata and area randomly behind the pilot or observer

Usage

DoubleObsRandom(strata, transects, split = 0.4, options = 5, tries = 10000)

Arguments

strata.path	The path name to the .shp file of the stratification. Must be in a format accepted by SplitDesign.
solution	The solution from a DoubleObsRandom optimization.

Details

DoubleObsRandom is designed to take 2 spatial objects: a stratification base layer and transect layer represented as spatial lines, and assign a third observer (during a double-observer detection study) approximately equally behind both front seat observers. The function simulates possible random combinations of left and right seat and will throw out those that aren't within split proportion. The resulting map and design will offer n options (options defaults to 5) that can then be checked by the field crew for logistical feasibility.

Value

None

Author(s)

Charles Frost, [e-mail]

References

https://github.com/cfrost3/AKaerial

Examples

 ShowMeDouble(strata.path="C:/Habitat.shp", solution=DoubleObsRandom(strata=MyStrata, transects=MyTransects))

USFWS/AKaerial documentation built on April 3, 2025, 4:06 p.m.