redisltraj {adehabitat}R Documentation

Rediscretization of a Traject With Regular Step Length

Description

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

Usage

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

Arguments

l an object of class ltraj
u the new step length
burst The burst identity of trajects to be rediscretized.
samplex0 Whether the first relocation of the traject should be sampled
addbit logical. Whether the line segment linking the last relocation of the rediscretized traject and the last relocation of the raw traject 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 traject. If not specified, this maximum is equal to 5 times the number of relocations of the raw traject.

Details

The rediscretization of traject 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).

Value

An object of class "ltraj"

Author(s)

Clement Calenge calenge@biomserv.univ-lyon1.fr

References

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.

See Also

ltraj for further information on objects of class ltraj

Examples

data(puechcirc)

puechcirc

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

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


[Package adehabitat version 1.6-1 Index]