adehabitat: Analysis of Habitat Selection by Animals

Description Usage Arguments Details Author(s) See Also Examples

These functions convert maps of classes available in adehabitat toward classes available in the package sp and conversely.

kasc2spixdf converts an object of class kasc into an object of class SpatialPixelsDataFrame.

asc2spixdf converts an object of class asc into an object of class SpatialGridDataFrame.

spixdf2kasc converts an object of class SpatialPixelsDataFrame or SpatialGridDataFrame into an object of class asc or kasc.

area2spol converts an object of class area into an object of class SpatialPolygons.

spol2area converts an object of class SpatialPolygons or SpatialPolygonsDataFrame into an object of class area.

attpol2area gets the data attribute of an object of class SpatialPolygonsDataFrame and stores it into a data frame.

traj2spdf converts an object of class traj into an object of class SpatialPointsDataFrame.

traj2sldf converts an object of class traj into an object of class SpatialLinesDataFrame.

ltraj2spdf converts an object of class ltraj into an object of class SpatialPointsDataFrame.

ltraj2sldf converts an object of class ltraj into an object of class SpatialLinesDataFrame.

kver2spol converts an object of class kver into an object of class SpatialPolygons.

kasc2spixdf(ka)
asc2spixdf(a)
spixdf2kasc(sg)
area2spol(ar)
spol2area(sr)
attpol2area(srdf)
traj2spdf(tr)
traj2sldf(tr, byid = FALSE)
ltraj2spdf(ltr)
ltraj2sldf(ltr, byid = FALSE)
kver2spol(kv)

`ka`	an object of class `kasc`.
`a`	an object of class `asc`.
`sg`	an object of class `SpatialPixelsDataFrame` or `SpatialGridDataFrame`.
`ar`	an object of class `area`.
`sr`	an object of class `SpatialPolygons` or `SpatialPolygonsDataFrame`.
`srdf`	an object of class `SpatialPolygonsDataFrame`.
`tr`	an object of class `traj`.
`ltr`	an object of class `ltraj`.
`kv`	an object of class `kver`.
`byid`	logical. If `TRUE`, one objects of class `Lines` correspond to one animal. if `FALSE`, one object of class `Lines` correspond to one burst.

We describe here more in detail the functions spol2area and attpol2area. Objects of class area do not deal with holes in the polygons, whereas the objects of class SpatialPolygons do. Therefore, when holes are present in the SpatialPolygons object passed as argument, the function spol2area ignore them and returns only the external contour of the polygon (though a warning is returned).

Clement Calenge clement.calenge@oncfs.gouv.fr, code of spixdf2kasc kindly provided by Roger Bivand Roger.Bivand@nhh.no

asc for information on objects of class asc, kasc for info on objects of class kasc, area for info on objects of class area, traj for objects of class traj, ltraj for objects of class ltraj.

## Not run: 
if (require(sp)) {

#########################################
##
## Conversion kasc -> SpatialPixelsDataFrame
##

data(puechabon)
toto <- kasc2spixdf(puechabon$kasc)
image(toto)
summary(toto)

#### and conversely
toto <- spixdf2kasc(toto)
image(toto)
hist(toto)

data(meuse.grid)
m <- SpatialPixelsDataFrame(points = meuse.grid[c("x", "y")],
                           data = meuse.grid)
i <- spixdf2kasc(m)
image(i)


### conversion asc -> SpatialPixelsDataFrame
cuicui <- asc2spixdf(getkasc(toto,1))
image(cuicui)


#########################################
##
## Conversion kver -> SpatialPolygons
##

hr <- getverticeshr(kernelUD(puechabon$locs[,c("X","Y")], puechabon$locs$Name,
                    grid=100))

plot(hr)
class(hr)
spo <- kver2spol(hr)
plot(spo)
class(spo)

#########################################
##
## Conversion area -> SpatialPolygons
##

data(elec88)
ar <- as.area(elec88$area)
plot(ar)
toto <- area2spol(ar)
plot(toto)


#########################################
##
## Conversion SpatialPolygons -> area
##

## First create an object of class "SpatialRingsDataFrame"
tutu <- SpatialPolygonsDataFrame(toto, elec88$tab)

## and then conversion:
coincoin <- spol2area(tutu)
plot(coincoin)

## gets the attributes
haha <- attpol2area(tutu)
area.plot(coincoin, values = haha$Waechter)


#########################################
##
## Conversion ltraj -> SpatialPointsDataFrame
##

data(puechcirc)
plot(puechcirc)

toto <- ltraj2spdf(puechcirc)
plot(toto)



#########################################
##
## Conversion ltraj -> SpatialLinesDataFrame
##

toto <- ltraj2sldf(puechcirc)
plot(toto)


}

## End(Not run)