last_first: Find a tag's first detection at its last location
In Myfanwy/tagtales: Functions For Summarizing Acoustic and PIT Telemetry Data

Description Usage Arguments Details Value Author(s)

View source: R/last_first.R

last_first: extract the first detection of a fish at its last known location.

last_first(
  detdf,
  tagidcol = "TagID",
  datetimecol = "DateTimeUTC",
  stationcol = "Station"
)

`detdf`	a dataframe of detections for multiple tagged animals
`tagidcol`	Name of the column (in quotes) corresponding to individual tag IDs
`datetimecol`	Name of the column corresponding to detection date and time (must be in POSIXct ymd_hm/s format)
`stationcol`	Name of the column corresponding to location or station information

This function takes a dataframe of detections and extracts the first detection of each tag, and the first detection at each tag's last station, and returns a dataframe with this information so that the travel time can then be easily calculated

a dataframe with five columns: TagID, first_det (first detection of tag), first_stn (first station), last_arrival (first detection time at final station), last_stn (station where last arrival was recorded).

Myfanwy Johnston

Myfanwy/tagtales documentation built on Nov. 13, 2021, 6:33 a.m.