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Last data update: 2014.03.03

R: Calculates the dynamic brownian motion variance

brownian.motion.variance.dyn

R Documentation

Calculates the dynamic brownian motion variance

Description

A function to calculate the dynamic brownian motion variance for a movement track. It can be used by advanced programmers to program against.

Usage

## S4 method for signature '.MoveTrackSingle,numeric,numeric,numeric'
brownian.motion.variance.dyn(object, location.error, window.size, margin)

Arguments

`object`	An object of the Move-class, that can be used for variance calculation. It needs to be in a flat coordinate system.
`location.error`	A numeric vector with the location error.
`window.size`	The window size used for the variance calculation.
`margin`	The margin size used for variance calculation.

Value

An object of the type dBMvariance is returned

Author(s)

Bart Kranstauber

References

Kranstauber, B., Kays, R., LaPoint, S. D., Wikelski, M. and Safi, K. (2012), A dynamic Brownian bridge movement model to estimate utilization distributions for heterogeneous animal movement. Journal of Animal Ecology. doi: 10.1111/j.1365-2656.2012.01955.x

Examples

data(leroy)
data2 <- spTransform(leroy[1:80,], CRSobj="+proj=aeqd +ellps=WGS84", center=TRUE)
err<-rep(23.5,n.locs(data2))
dBMvar <- brownian.motion.variance.dyn(data2, location.error=err, margin=13, window.siz=31)
dBMvar