[R-sig-eco] Compute the distance between the trajectories of two animals with varying sampling intervals

[Jeremy Chacon]

I bet Sarah's right and adehabitatLT has something, but I also know that
the longitudinalData package can compute distances between two trajectories
including the frechet distance.

http://www.inside-r.org/packages/cran/longitudinalData/docs/pathFrechet

However, it does not deal with the timing problem. You will have to roll
your own method of aligning the trajectories in time.

On Wed, Jul 22, 2015 at 9:02 AM, Sarah Goslee <sarah.goslee at gmail.com>
wrote:

> Try the adehabitatLT package.
>
> On Wed, Jul 22, 2015 at 9:41 AM, André Zehnder <andrezehnder at hotmail.com>
> wrote:
> > Hi list,
> >
> >
> >
> > I want to compute the distances between two trajectories that consist of
> a
> > sequence of point measurements. The trajectories do not have the same
> length
> > or sampling interval. So, while for animal A, there is a data point at
> 15.00
> > p.m. and another at 15.38 p.m, animal B might have data points at 14.56
> p.m.
> >
> > and 17.02 p.m.
> >
> >
> >
> > A possible approach would be to connect these point series to
> trajectories
> > and then calculate the distance between the two trajectories at the
> sampled
> > positions of one trajectory (take the sampled position of the second
> > trajectory that is temporally closest). Are there any packages in R (or
> > tools outside of R) that allow me to do this? The support of other
> distances
> > than the Euclidean one (e.g. Fr chet) would be an advantage.
> >
> >
> >
> > Best regards,
> >
> > Andre
> >
> >
> --
> Sarah Goslee
> http://www.functionaldiversity.org
>
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>



-- 

*___________________________________________________________________________Jeremy
M. Chacon, Ph.D.*

*Post-Doctoral Associate, Harcombe Lab*
*University of Minnesota*
*Ecology, Evolution and Behavior*

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