Densities: Standard ratio estimator for aerial survey data

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

Standard ratio estimator for aerial survey data

Description

Densities will combine spatially-referenced observations with design transects and strata to create an index estimate

Usage

Densities(data, area, output = FALSE)

Arguments

data	The DataSelect list object to be analyzed
area	The area code for dedicated MBM Alaska region surveys. Acceptable values include: YKD - Yukon Kuskokwim Delta, ducks YKDV - Yukon Kuskokwim Delta, 2018 visibility study YKG - Yukon Kuskokwim Delta, geese KIG - Kigigak Island ACP - Arctic Coastal Plain CRD - Copper River Delta WBPHS - The North American Waterfowl Breeding Population Habitat Survey BLSC - 2018 Black Scoter Survey
output	TRUE/FALSE Should results be written to text files in the current working directory?

Details

Densities is the primary function in AKaerial for producing index estimates. It will take an object from DataSelect and adjust counts, summarize spatial information, and calculate indices and their associated standard errors. Also retained are estimates of densities of bird by strata and on each transect.

Value

List object with 2 elements:

1. estimates Observer-specific estimates for the species indicated in the sppntable estimates column

2. counts.final Deeper level count information by transect, strata, species, and observer

Author(s)

Charles Frost, [e-mail]

References

https://github.com/USFWS/AKaerial

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