read.telemetry: Import Radio Fixes

Description

A shortcut function for constructing a telemetry capthist object from a file of telemetry fixes. Telemetry data are generally similar in format to polygon data (see addTelemetry).

Usage

read.telemetry(file = NULL, data = NULL, noccasions = NULL, covnames = NULL,
verify = TRUE, ...)

Arguments

file

character name of text file

data

data.frame containing fixes

noccasions

number of occasions (optional)

covnames

character vector of names for individual covariates

verify

logical for whether to check input

...

other arguments passed to countfields, read.table etc.

Value

An secr capthist object including attribute `detectedXY' with the x-y coordinates, and a `traps' object with detector type = `telemetry'

Details

Input data may be in a text file (argument file) or a dataframe (argument data). Data should be in the XY format for that function i.e. the first 5 columns should be Session, ID, Occasion, X, Y. Further columns are treated as individual covariates. No `traps' input is required. A traps object is generated automatically from the convex hull of the fixes, inflated by a tiny fraction (1e-8) in all directions to ensure all fixes lie inside.

Examples

Run this code

setwd('D:/bears/alberta')
## peak at raw data
head(readLines('gps2008.txt'))
gps2008CH <- read.telemetry("gps2008.txt")
plot( gps2008CH, gridsp = 10000)
head(gps2008CH)
secr.fit(gps2008CH, start = log(4000), detectfn = 'HHN')