seglength: Calculates the segment length of a track

In move: Visualizing and Analyzing Animal Track Data

Description

Calculates the segment length of a track

Usage

  ## S4 method for signature 'SpatialPointsDataFrame'
seglength(x)

Arguments

x	a SpatialPointsDataFrame, like a Move or MoveStack object

Details

The seglength function calculates the distances between point 1 and point 2, point 2 and point 3, ... .

Value

If the SpatialPointsDataFrame is projected in longitude latitude coordinates, the returned values are in meters. If not, the distances are Euclidean distances in map units. Distances are calculates with the pointDistance from the package raster. Note that in stacks distances are not split between animals.

Author(s)

Marco Smolla

Examples

data(leroy)
data(fishers)  
head(seglength(leroy)) #Move object in longlat projection
head(seglength(fishers)) #MoveStack object in aeqd projection

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 
[1]  6.382461  5.606722 12.671263  9.651801 11.733921 13.928818
Warning message:
'seglength' is deprecated.
Use 'distance' instead.
See help("Deprecated") 
[1]  6.382461  5.606722 12.671263  9.651801 11.733921 13.928818
Warning message:
'seglength' is deprecated.
Use 'distance' instead.
See help("Deprecated") 

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