[AniMov] New version of adehabitatLT and adehabitatHR

Clément Calenge clement.calenge at oncfs.gouv.fr
Thu Apr 28 18:39:57 CEST 2011

Dear all,

I have just uploaded to CRAN a new version of adehabitatLT and 
Significant changes in adehabitatLT are listed below:

* The residence time method of Barraquand and Benhamou (2008) is now 
implemented in the function residenceTime.

* The segmentation method of Lavielle (2000) (used for the residence 
time) is now implemented in the function lavielle.

* The function redisltraj now takes an additional argument 
type=c("space","time"). When type == "space", a rediscretization of the 
trajectory in steps of equal length is carried out (as previously). When 
type == "time", a rediscretization of the trajectory in steps of equal 
duration is carried out.

* a new function na.omit.ltraj can be used to remove missing values from 
a trajectory

* Several functions are now available to build null models for 
trajectory analysis (see the help page of the function testNM, as well 
as the vignette for additional information).

Significant changes in adehabitatHR are listed below:

* There is a major change in the function BRB: in the previous version 
of adehabitatHR, there was a slight inconsistency in the package design: 
whereas all the parameters characterizing the steps in an object of 
class "ltraj" (e.g. ‘dist, dx, dy’) describe the step between 
relocations i and i+1, it was required for ‘BRB’ that the activity 
described the proportion of activity time between relocation i-1 and i. 
This inconsistency has been corrected in the new version: the activity 
measured at relocation i should correspond to the activity of the animal 
between relocation i and i+1.

* The dependencies of adehabitatHR on the packages tripack and gpclib 
have been replaced by dependencies on the packages deldir and rgeos to 
circumvent the serious licence issues of the former.

All major changes are documented in the vignettes of the packages.
Happy testing,

Clément Calenge

Cellule d'appui à l'analyse de données
Direction des Etudes et de la Recherche
Office national de la chasse et de la faune sauvage
Saint Benoist - 78610 Auffargis
tel. (33)

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