redisltraj: Rediscretization of a Trajectory With Regular Step Length
In ClementCalenge/adehabitat: Analysis of Habitat Selection by Animals

Description Usage Arguments Details Value Author(s) References See Also Examples

This functions rediscretizes one or several trajectories in an object of class ltraj.

1 2	redisltraj(l, u, burst = NULL, samplex0 = FALSE, addbit = FALSE, nnew = 5)

`l`	an object of class `ltraj`
`u`	the new step length
`burst`	The burst identity of trajectories to be rediscretized.
`samplex0`	Whether the first relocation of the trajectory should be sampled
`addbit`	logical. Whether the line segment linking the last relocation of the rediscretized trajectory and the last relocation of the raw trajectory should be added to the result (can be useful for computation of fractal dimension)
`nnew`	optionnally, you may specify the maximum ratio between number of relocations of the new trajectory. If not specified, this maximum is equal to 5 times the number of relocations of the raw trajectory.

The rediscretization of trajectory has been advocated by several authors in the literature (Turchin 1998, Bovet & Benhamou 1988). It is also the first step of the computation of the fractal dimension of the path (Sugihara & May 1990).

An object of class "ltraj"

Clement Calenge clement.calenge@oncfs.gouv.fr

Bovet, P., & Benhamou, S. (1988) Spatial analysis of animal's movements using a correlated random walk model. Journal of Theoretical Biology 131: 419–433.

Turchin, P. (1998) Quantitative analysis of movement, Sunderland, MA.

Sugihara, G., & May, R. (1990) Applications of fractals in Ecology. Trends in Ecology and Evolution 5: 79–86.

ltraj for further information on objects of class ltraj

data(puechcirc)

puechcirc

## before rediscretization
plot(puechcirc, perani = FALSE)

## after rediscretization
toto <- redisltraj(puechcirc, 100)
plot(toto, perani = FALSE)