COA: Short-term Centers of Activity

In VTrack: A Collection of Tools for the Analysis of Remote Acoustic Telemetry Data

Description

Function to calculate Short-term centers of activity positions from passive telemetry data. Based on technique described in: Simpfendorfer, C. A., M. R. Heupel, and R. E. Hueter. 2002. Estimation of short-term centers of activity from an array of omnidirectional hydrophones and its use in studying animal movements. Canadian Journal of Fisheries and Aquatic Sciences 59:23-32.

Usage

COA(tagdata, id, timestep, ...)

Arguments

tagdata	a data frame containing acoustic tracking data in the VEMCO VUE export format (default). file must contain Longitude Latitude information
id	a character string containing column name in the data frame for the unique tag identifier
timestep	an integer containing the temporal bin size of center of activity calculations (in minutes)
...	Graphical parameters. Any argument that can be passed to image.plot and to plot, such as axes=FALSE, main='title', ylab='latitude'

Value

Exports a data frame when one tag is used and a list object containing multiple data frames when multiple tag ids are used

DateTime	a factor of the temporal bin used in the COA analysis 'yyyy-mm-dd HH:MM:SS'
Transmitter	a character vector giving the code space and tag id code
Transmitter.Name	a factor containing the name of the animal as identified by the user
Transmitter.Serial	an numeric vector of the transmitter serial number
Sensor.Value.coa	a numeric vector containing the mean sensor value for a temporal bin
Sensor.unit	a character vector csensor unit
Latitude.COA	a numeric vector containing the mean Latitude value for a temporal bin)
Longitude.COA	a numeric vector containing the mean Longitude value for a temporal bin

Author(s)

Vinay Udyawer, Colin Simpfendorfer

VTrack documentation built on May 2, 2019, 9:16 a.m.