speed: Speed between the locations of a movement track

Description Usage Arguments Value Author(s) Examples

Description

This function returns the speed between consecutive locations of Move or MoveStack object.

Usage

1
2
3
4
  ## S4 method for signature '.MoveTrackSingle'
speed(x)
  ## S4 method for signature '.MoveTrackStack'
speed(x)

Arguments

x

a move, moveStack or moveBurst object

Value

Speed in map units/second.
If the projection of the coordinates is long/lat all values are returned in m/s, otherwise in the map units/second of the projection of the move object. Check and set the projection of your Move, MoveStack or MoveBurst object using the proj4string() function.

If a move or moveBurst object is provided, a numeric vector one element shorter than the number of locations is obtained.
If a moveStack object is provided, a list with one element per individual containing a numeric vector one element shorter than the number of locations is obtained.

Author(s)

Marco Smolla & Anne Scharf

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
# speeds from a Move object 
data(leroy)
head(speed(leroy))
 # to add this information to the move object, a "NA" has to be assigened
 # e.g. to the last location (it also could be assigend to the first location).
leroy$speed <- c(speed(leroy), NA)

## speeds from a MoveStack object
data(fishers)
str(speed(fishers))
 # to add this information to the moveStack object, a "NA" has to be assigened
 # e.g. to the last location of each individual (it also could be assigend to the first location).
fishers$speed <-unlist(lapply(speed(fishers), c, NA))

move documentation built on Nov. 17, 2017, 8:07 a.m.