CharHull {adehabitatHR} | R Documentation |

## Estimation of the Home Range by Delaunay Triangulation method

### Description

The function `CharHull`

implements the method developed by Downs
and Horner (2009) for the home range estimation.

### Usage

```
CharHull(xy, unin = c("m", "km"),
unout = c("ha", "m2", "km2"),
duplicates = c("random", "remove"), amount = NULL)
```

### Arguments

`xy` |
an object inheriting the class |

`unin` |
the units of the relocations coordinates. Either "m" (default) for meters or "km" for kilometers |

`unout` |
the units of the output areas. Either "m2" for square meters, "km2" for square kilometers or "ha" for hectares (default) |

`duplicates` |
a setting to determine how duplicated points are handled. If "random" the duplicated points are slightly moved randomly. If "remove" the duplicated points are removed. |

`amount` |
if |

### Details

This method consists in the computation of the Delaunay triangulation
of the set of relocations. Then, the triangles are ordered from the
smallest to the largest. It is possible to select a given percentage
of the smallest triangles (measured by their area) as the home-range
estimation. The contour can be extracted with the function
`getverticeshr`

### Value

an object of the class `MCHu`

### Note

This function relies on the package `deldir`

.

### Author(s)

Clement Calenge clement.calenge@ofb.gouv.fr

### References

Downs J.A. and Horner, M.W. (2009) A Characteristic-Hull Based Method
for Home Range Estimation. *Transactions in GIS*, **13**,
527–537.

### See Also

`MCHu`

for further information on the class
`MCHu`

, and `SpatialPolygonsDataFrame-class`

for
additional information on this class. See `getverticeshr`

to extract a given home range contour.

### Examples

```
## Not run:
data(puechabonsp)
lo<-puechabonsp$relocs[,1]
## Home Range Estimation
res <- CharHull(lo)
## Displays the home range
plot(res)
## Computes the home range size
MCHu2hrsize(res)
## Computes the 95 percent home range
ver <- getverticeshr(res)
ver
plot(ver)
## End(Not run)
```

*adehabitatHR*version 0.4.21 Index]