adehabitatLT: gdltraj – R documentation

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gdltraj

Working with Trajectories: Specify a Time Period

Description

Gets the parts of the trajectories stored in an object of class ltraj of type II (time recorded), corresponding to a specified time period.

Usage

gdltraj(x, min, max, type = c("POSIXct", "sec", "min", "hour", "mday",
        "mon", "year", "wday", "yday"))

Arguments

`x`	an object of class `ltraj` of type II (time recorded)
`min`	numeric. The beginning of the period to consider
`max`	numeric. The end of the period to consider
`type`	character. The time units of `min` and `max`

Details

The limits of the period to consider may correspond to any of the components of the list of class POSIXlt (hour, day, month, etc.; see help(POSIXlt)), or to dates stored in objects of class POSIXct (see examples). The corresponding metadata in the attribute infolocs are also returned.

Value

an object of class ltraj.

Author(s)

Clement Calenge clement.calenge@ofb.gouv.fr

Examples

data(puechcirc)
plot(puechcirc, perani = FALSE)

## Gets all the relocations collected
## between midnight and 3H AM 
toto <- gdltraj(puechcirc, min = 0, max = 3, type="hour")
plot(toto, perani = FALSE)

## Gets all relocations collected between the 15th
## and the 25th august 1993
lim <- as.POSIXct(strptime(c("15/08/1993", "25/08/1993"),
                  "%d/%m/%Y", tz="Europe/Paris"))
tutu <- gdltraj(puechcirc, min = lim[1],
                max = lim[2], type="POSIXct")
plot(tutu, perani = FALSE)

adehabitatLT

Analysis of Animal Movements

v0.3.25

GPL (>= 2)

Authors

Clement Calenge, contributions from Stephane Dray and Manuela Royer

Initial release

2020-01-11