mcp {adehabitat} | R Documentation |
mcp
computes the home range of several
animals using the minimum convex polygon estimator.
mcp.area
is used for home-range size estimation. This function
requires the package gpclib
.
plot.hrsize
is used to display the home-range size estimated at
various levels.
mcp(xy, id, percent = 95) mcp.area(xy, id, percent = seq(20,95, by=5) unin = c("m", "km"), unout = c("ha", "km2", "m2")) plot.hrsize(x, ...)
xy |
a data frame containing the coordinates of the relocation of the monitored animals |
id |
a factor giving the identity of the animal for each relocation |
percent |
100 minus the proportion of outliers to be excluded from the computation |
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) |
x |
an objet of class hrsize returned by the function
mcp.area , or kernel.area (see the help page of this
function) |
... |
additionnal arguments to be passed to the function
plot |
This function computes the Minimum Convex Polygon estimation after the
removal of (100 minus percent)
percent of the relocations the
farthest away from the barycenter of the home range (computed by the
arithmetic mean of the coordinates of the relocations for each
animal).
mcp
returns an object of class area
, with one polygon
per level of the factor ID.
mcp.area
returns a data frame of class hrsize
,
with one column per animal and one row per level of
estimation of the home range
Clément Calenge calenge@biomserv.univ-lyon1.fr
Mohr, C.O. (1947) Table of equivalent populations of north american small mammals. The American Midland Naturalist, 37, 223-249.
chull
, area.plot
to have a
graphical display of the home ranges, as.area
for
additionnal information on the class area
, and
area2dxf
for further exportation toward a GIS.
s.chull
for another way to display MCP
data(puechabon) locs <- puechabon$locs cp <- mcp(locs[,4:5], locs[,1]) ## Plot the home ranges opar <- par(mar = c(0,0,0,0)) area.plot(cp) ## ... And the relocations points(locs[,4:5], pch = 16, col = as.numeric(locs[,1])) par(opar) ## Computation of the home-range size: if (require(gpclib)) { (cuicui1 <- mcp.area(locs[,4:5], locs[,1])) plot(cuicui1) }