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

[Li Wen]

You may have to make the two trajectories regular with the same interval.  Package adehabitatLT has functions to do this.

Cheers
Li
________________________________________
From: R-sig-ecology [r-sig-ecology-bounces at r-project.org] on behalf of Sarah Goslee [sarah.goslee at gmail.com]
Sent: Thursday, 23 July 2015 12:02 AM
To: André Zehnder
Cc: r-sig-ecology at r-project.org
Subject: Re: [R-sig-eco] Compute the distance between the trajectories of two animals with varying sampling intervals

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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