DEPONS2R (version 1.2.2)

read.DeponsTrack: Reading DEPONS track files

Description

Function for reading movement tracks produced by DEPONS. These describe movements of simulated animals within the simulation landscape, where the positions after each 30-min time step are provided using the coordinate reference system that were used for generating these landscapes.See van Beest et al. (2018) and Nabe-Nielsen et al. (2013) for details regarding how these files were generated as a balance between correlated random walk behaviour and spatial memory behaviour, which allows animals to return to previously visited food patches.

Usage

read.DeponsTrack(
  fname,
  title = "NA",
  landscape = "NA",
  simtime = "NA",
  crs = as.character(NA),
  tz = "UTC"
)

Value

Returns a DeponsTrack object with the elements title, simtime, crs, and tracks. The date is extracted from input data if not provided explicitly and stored as a POSIXlt object. The element tracks is a list of objects of class SpatialPointsDataFrame, each of which corresponds to one simulated animal (several animals can be tracked in one simulation).

Arguments

fname

Name of the file (character) that contains movement data generated by DEPONS. The name includes the path to the directory if this is not the current working directory.

title

Optional character string giving name of simulation

landscape

Optional character string with the landscape used in the simulation

simtime

Character sting with date of simulation (format yyyy-mm-dd). If not provided this is obtained from name of input file

crs

Character, coordinate reference system (map projection)

tz

Time zone used in simulations. Defaults to UTC/GMT. #'

Examples

data(porpoisetrack) # Load data for use in example

# Use standard DEPONS coordinate reference system / map projection:
the.crs <- "+proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000
 +datum=WGS84 +units=m +no_defs"

if (FALSE) {
one.fname <- "~/Applications/DEPONS/
  RandomPorpoise.2020.Jul.31.09_43_10.csv"

porpoisetrack <- read.DeponsTrack(one.fname, title="Track simulated using DEPONS 2.0",
  crs=the.crs)

}

# Plot the first of the simulated tracks
plot(porpoisetrack)