brownian.motion.variance.dyn: Calculates the dynamic brownian motion variance

In move: Visualizing and Analyzing Animal Track Data

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

See Also

brownian.bridge.dyn

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

Example output

Loading required package: geosphere
Loading required package: sp
Loading required package: raster
Loading required package: rgdal
rgdal: version: 1.2-10, (SVN revision 673)
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 1.10.1, released 2013/08/26
 Path to GDAL shared files: /usr/share/gdal/1.10
 Loaded PROJ.4 runtime: Rel. 4.8.0, 6 March 2012, [PJ_VERSION: 480]
 Path to PROJ.4 shared files: (autodetected)
WARNING: no proj_defs.dat in PROJ.4 shared files
 Linking to sp version: 1.2-3 
NOTE: rgdal::checkCRSArgs: no proj_defs.dat in PROJ.4 shared files
NOTE: rgdal::checkCRSArgs: no proj_defs.dat in PROJ.4 shared files
NOTE: rgdal::checkCRSArgs: no proj_defs.dat in PROJ.4 shared files
NOTE: rgdal::checkCRSArgs: no proj_defs.dat in PROJ.4 shared files
class       : dBMvariance 
features    : 80 
extent      : -2084.331, 2085.19, -1763.593, 1763.915  (xmin, xmax, ymin, ymax)
coord. ref. : +proj=aeqd +ellps=WGS84 +lon_0=-73.8734723 +lat_0=42.73388425 
variables   : 17
names       :           timestamp, eobs.battery.voltage, eobs.horizontal.accuracy.estimate, eobs.key.bin.checksum, eobs.speed.accuracy.estimate,    eobs.start.timestamp, eobs.status, eobs.temperature, eobs.type.of.fix, eobs.used.time.to.get.fix, ground.speed, heading, height.above.ellipsoid, utm.easting, utm.northing, ... 
min values  : 2009-02-11 12:16:45,                 3615,                              3.33,               7099154,                         2.39, 2009-02-11 12:14:59.000,           A,               15,                3,                         4,         0.02,    0.00,                   -5.3,    590119.2,      4730144, ... 
max values  : 2009-02-13 03:01:38,                 3666,                             66.56,            4219653549,                        21.32, 2009-02-13 03:00:01.000,           A,               35,                3,                       108,         7.64,  359.79,                  153.7,    594325.1,      4733640, ... 
timestamps  : 2009-02-11 12:16:45 ... 2009-02-13 03:01:38 Time difference of 2 days  (start ... end, duration) 
sensors     : gps 
indiv. data : eobs.fix.battery.voltage, manually.marked.outlier, visible, sensor.type, individual.taxon.canonical.name, tag.local.identifier, individual.local.identifier, study.name, study.timezone 
indiv. value: 0 NA true gps Martes pennanti 74 Leroy Urban fisher GPS tracking Eastern Standard Time 
unused rec. : 1071 
margin      : 13 
window size : 31 

move documentation built on Jan. 16, 2017, 2:22 a.m.