Compute the distance between the trajectories of two animals with varying sampling intervals
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, Andr? 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* [[alternative HTML version deleted]]