brownian.motion.variance {BBMM}R Documentation

Brownian motion variance

Description

Estimates Brownian motion variance for a Brownian bridge movement model.

Usage

brownian.motion.variance(n.locs, time.lag, location.error, x, y, max.lag)

Arguments

n.locs

Number of observed locations in time and space.

time.lag

Vector of time differences (usually in minutes) between successive locations. The length(time.lag) = length(x) - 1.

location.error

The standard deviation of normally distributed location errors (single value or vector of 1 value for each observation).

x

Vector of x coordinates (meters) of locations, ordered in time.

y

Vector of y coordinates (meters) of locations, ordered in time.

max.lag

Maximum lag between successful fixes to consider.

Details

Users will generally not call this function directly. It is sourced by brownian.bridge.

Value

The estimate of Brownian motion variance, or diffusion coefficient related to the mobility of the object.

Author(s)

Ryan Nielson, Hall Sawyer, and Trent McDonald (WEST, Inc., www.west-inc.com)

Maintainer: Ryan Nielson rnielson@west-inc.com

References

Horne, J. S., E. O. Garton, S. M. Krone, and J. S. Lewis. 2007. Analyzing animal movements using Brownian bridges. Ecology 88:2354-2363.

Sawyer, H., M. J. Kauffman, R. M. Nielson, and J. S. Horne. 2009. Identifying and prioritizing ungulate migration routes for landscpe-level conservation. Ecological Applications 19:2016-2025.

See Also

brownian.bridge

Examples

data(locations)
BBMM <- brownian.bridge(x=locations$x, y=locations$y, 
            time.lag=locations$time.lag[-1], location.error=20, 
            cell.size=50)

[Package BBMM version 3.0 Index]