DataSelect: Format and summarize a clean data set for analysis
In USFWS/AKaerial: Analysis of Alaska Region Aerial Survey Data

DataSelect

R Documentation

Format and summarize a clean data set for analysis

Description

DataSelect will combine observation, design transect, and stratification layers into a summary list for analysis

Usage

DataSelect(
  area,
  data.path = NA,
  strata.path = NA,
  transect.path = NA,
  threshold = 0.5
)

Arguments

`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
`data.path`	The location of the QA/QC checked data file
`strata.path`	The location of the analysis stratification .shp file
`transect.path`	The location of the transect design .shp file
`threshold`	The distance in kilometers from a design file where observations are no longer counted. Defaults to 0.5 km.

Details

DataSelect reads in a clean data file (passed through GreenLight function) and pulls all observations with code==1. All observations coded as open 1 are then changed to single 1. The transect layer is then placed on the stratification and trimmed and renumbered from navigational numbers to analysis numbering. Species codes that need specific project treatments will be changed. Counts are adjusted for different indices at the row level. The resulting list object is the primary currency for design-based ratio estimator analysis.

Value

List object with 5 elements:

obs The original data file with corrected transect and stratification information
flight The flown transects for the observer with corrected numbering
design The split design information
strata The spatial polygon summary for the stratification layer
transect Observations summarized at the transect level