speed {move} | R Documentation |
Speed between the locations of a movement track
Description
This function returns the speed between consecutive locations of Move or MoveStack object.
Usage
## S4 method for signature '.MoveTrackSingle'
speed(x)
## S4 method for signature '.MoveTrackStack'
speed(x)
Arguments
x |
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
# 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$speed <- c(speed(leroy), NA)
## speeds from a MoveStack object
data(fishers)
str(speed(fishers))
# to add this information to the moveStack object, a "NA" has to be assigened
# e.g. to the last location of each individual (the speed belongs to the following segment).
fishers$speed <- unlist(lapply(speed(fishers),c, NA ))
[Package move version 4.2.4 Index]