join.asc {adehabitat} | R Documentation

## Finds the Value of Mapped Variables at some Specified Locations (Spatial Join)

### Description

`join.asc` finds the value of a mapped variable at some specified locations.
`join.kasc` is the same function as `join.asc`, with several maps.

### Usage

     join.asc(pts, x)
     join.kasc(pts, w)

### Arguments

`x` | an object of class `asc`
`w` | an object of class `kasc`
`pts` | a data frame containing the x and y coordinates of the points to be placed on the map.

### Value

`join.asc` returns a vector with length equals to the number of points in `pts`.
`join.kasc` returns a data frame with a number of columns equals to the number of variables in the object of class `kasc`, and with each row corresponding to the rows of `pts`.

### Author(s)

Clément Calenge calenge@biomserv.univ-lyon1.fr

### See Also

`as.kasc` and `import.asc`

### Examples

    data(puechabon)
    x <- puechabon$kasc

    ## for each relocation, finds the values of the variables in x
    toto <- join.kasc(pts = cbind(puechabon$locs$X, puechabon$locs$Y), x)
    toto[1:4,]

[Package adehabitat version 1.4 Index]