CRDHistoric: Current table of historic estimates for the Copper River...
In USFWS/AKaerial: Analysis of Alaska Region Aerial Survey Data

CRDHistoric

R Documentation

Current table of historic estimates for the Copper River Delta study area

Description

Population indices for the USFWS Region 11 Migratory Bird Management Copper River Delta study area. The survey consists of low-level aerial observations of waterfowl on a stratified strip transect design. For more information on how the estimates are generated, see DataSelect or Densities. For definitions of the indices, see AdjustCounts. For a complete list of input files, see MasterFileList.

Usage

data(CRDHistoric)

Format

A list object with 3 data frames:

output.table

Data frame of observer-specific estimates for the years 1986-2019, with the exception of 2013, currently 217 rows of the following 19 variables:

Year: The 4-digit integer year of the survey, range from 1986 to 2019 (no survey in 2013).
Observer: The 3-character code representing the initials of the observer.
Species: The 4-character code for the species represented, see sppntable.
total.est: Total estimated birds (floating point decimal).
itotal.est: Estimated indicated total birds (floating point decimal).
ibbtotal.est: Total estimated indicated breeding birds (floating point decimal).
sing1pair2.est: Total estimated singles and pairs (floating point decimal).
flock.est: Total estimated flocked birds (floating point decimal).
var.N: Variance of total.est (floating point decimal).
var.Ni: Variance of itotal.est (floating point decimal).
var.Nib: Variance of ibbtotal.est (floating point decimal).
var.Nsing1pair2: Variance of sing1pair2.est (floating point decimal).
var.Nflock: Variance of flock.est (floating point decimal).
SE: Standard error of total.est (floating point decimal).
SE.i: Standard error of itotal.est (floating point decimal).
SE.ibb: Standard error of ibbtotal.est (floating point decimal).
SE.sing1pair2: Standard error of sing1pair2.est (floating point decimal).
SE.flock: Standard error of flock.est (floating point decimal).
area: The character string project code (CRD - Copper River Delta).

expanded.table

Data frame of observer-specific estimates broken down to the stratum level for the years 1986-2019, with the exception of 2013, currently 651 rows of the following 40 variables:

strata: The character string representing the stratum.
Year: The 4-digit integer year of the survey, range from 1986 to 2019 (no survey in 2013).
Observer: The 3-character code representing the initials of the observer.
Species: The 4-character code for the species represented, see sppntable.
total: Total observed birds (integer).
itotal: Indicated total observed birds (integer).
ibb: Total observed indicated breeding birds (integer).
sing1pair2: Total observed singles and pairs (integer).
flock: Total observed flocked birds (integer).
total.v: Variance of the counts of total birds (floating point decimal).
itotal.v: Variance of the counts of indicated total birds (floating point decimal).
ibb.v: Variance of the counts of indicated breeding birds (floating point decimal).
sing1pair2.v: Variance of the counts of singles and pairs (floating point decimal).
flock.v: Variance of the counts of flocked birds (floating point decimal).
total.cov: Covariance of the counts of total birds and transect areas (floating point decimal).
itotal.cov: Covariance of the counts of indicated total birds and transect areas (floating point decimal).
var.N: Variance of total.est (floating point decimal).
var.Ni: Variance of itotal.est (floating point decimal).
ibb.cov: Covariance of the counts of indicated breeding birds and transect areas (floating point decimal).
var.Nib: Variance of ibbtotal.est (floating point decimal).
sing1pair2.cov: Covariance of the counts of singles and pairs and transect areas (floating point decimal).
var.Nsing1pair2: Variance of sing1pair2.est (floating point decimal).
flock.cov: Covariance of the counts of flocked birds and transect areas (floating point decimal).
var.Nflock: Variance of flock.est (floating point decimal).
total.area: Total sampled area in km^2^, specific to strata-Year-Observer combinations (floating point decimal).
total.area.var: Variance of the sampled areas (floating point decimal).
density.total: Observed density of total birds (birds per km^2^, floating point decimal).
density.itotal: Observed density of indicated total birds (birds per km^2^, floating point decimal).
density.ibb: Observed density of indicated breeding birds (birds per km^2^, floating point decimal).
density.sing1pair2: Observed density of singles and pairs (birds per km^2^, floating point decimal).
density.flock: Observed density of flocked birds (birds per km^2^, floating point decimal).
layer.area: Total area in km^2^ of the stratum (floating point decimal).
diff: Total north-south extent of the survey in km excluding any water-only breaks, used to determine the maximum possible number of transects that could be in design (floating point decimal).
M: The maximum number of 0.2 km strip transects that could occur simultaneously in a stratum (floating point decimal).
total.est: Total estimated birds (floating point decimal).
itotal.est: Estimated indicated total birds (floating point decimal).
ibbtotal.est: Total estimated indicated breeding birds (floating point decimal).
sing1pair2.est: Total estimated singles and pairs (floating point decimal).
flock.est: Total estimated flocked birds (floating point decimal).
area: The character string project code (CRD - Copper River Delta).

combined

Data frame of combined observer estimates (or single observer in years where estimates were not combined) for the years 1986-2019, with the exception of 2013, currently 132 rows of the following 18 variables:

Year: The 4-digit integer year of the survey, range from 1986 to 2019 (no survey in 2013).
Species: The 4-character code for the species represented, see sppntable.
total: Total estimated birds (floating point decimal).
total.var: Variance of total (floating point decimal).
total.se: Standard error of total (floating point decimal).
itotal: Estimated indicated total birds (floating point decimal).
itotal.var: Variance of itotal (floating point decimal).
itotal.se: Standard error of itotal (floating point decimal).
ibb: Total estimated indicated breeding birds (floating point decimal).
ibb.var: Variance of ibb (floating point decimal).
ibb.se: Standard error of ibb (floating point decimal).
sing1pair2: Total estimated singles and pairs (floating point decimal).
sing1pair2.var: Variance of sing1pair2 (floating point decimal).
sing1pair2.se: Standard error of sing1pair2 (floating point decimal).
flock: Total estimated flocked birds (floating point decimal).
flock.var: Variance of flock (floating point decimal).
flock.se: Standard error of flock (floating point decimal).
area: The character string project code (CRD - Copper River Delta).