TwilightFree: Specify a model for forwards-backwards estimation

In ABindoff/TwilightFree: Reconstruct animal tracks from GLS tag data

Description

Specify a model for forwards-backwards estimation

Usage

TwilightFree(df, alpha = c(1, 1/10), beta = c(1, 1/4), dt = NULL,
  threshold = 5, zenith = 96, deployed.at = F, retrieved.at = F,
  fixd = NULL, sst = NULL)

Arguments

df	data.frame containing 'Light', 'Date', and optionally 'Temp' data
alpha	hyperparameters for the noise (shading) assumption
beta	hyperparameters for the movement assumption
dt	optional parameter specifying the number of seconds in a segment (day)
threshold	tag-specific value for luminance at twilight (obtained by calibration)
zenith	solar zenith angle at twilight
deployed.at	deployment location c(lon, lat) for first day of observation
retrieved.at	retrieval location c(lon, lat) for last day of observation
fixd	optional data.frame of fixed (known) locations containing 'Date', 'Lon', 'Lat' (will overwrite deployed.at and retrieved.at locations if != NULL)
sst	raster of SST data from NOAA OI SST

Value

a TwilightFree model object which can be fitted using SGAT::essie()

ABindoff/TwilightFree documentation built on March 10, 2021, 2:16 p.m.