findmaxasc: Find Local Maxima on a Map of Class 'asc'
In ClementCalenge/adehabitat: Analysis of Habitat Selection by Animals

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

findmaxasc finds the local maxima on a map of class asc.

1	findmaxasc(asc)

asc

a map of class asc

This function may be useful, among other things, to identify the local modes of the utilization distribution of an animal (e.g. estimated using kernelUD).

a data frame with two columns containing the x and y coordinates of the local maxima.

Clement Calenge clement.calenge@oncfs.gouv.fr

as.asc, kernelUD

## example, to find the mode of the utilization distribution (UD) of an
## animal:

## load the data
data(puechabon)
loc <- puechabon$locs[, c("X", "Y")]
id <- puechabon$locs[, "Name"]

## Estimation of UD for the four animals
(ud <- kernelUD(loc, id))
image(ud)


## Now consider the UD of Chou
map <- ud$Chou$UD
image(map)

## Find the local maxima:
maxim <- findmaxasc(map)
points(maxim, col="red", pch=16, cex=1.5)