ascgen: Creation of Raster Maps

In adehabitat: Analysis of Habitat Selection by Animals

Description

ascgen creates an object of class asc using a set of points.

Usage

ascgen(xy = NULL, cellsize = NULL, nrcol = 10, count = TRUE)

Arguments

xy	a data frame with two columns containing the x and y coordinates of the points
cellsize	the cellsize attribute of the object of class asc to be created
nrcol	the size of the square raster map to be created (number of rows and columns)
count	logical. If TRUE, the object of class asc contains the number of points in each cell. If FALSE, all the cells are set to zero

Value

Returns an object of class asc.

Author(s)

Clement Calenge [e-mail]

See Also

asc for additional information on objects of class asc.

Examples

data(puechabon)
lo <- puechabon$locs[,c("X","Y")]
plot(lo, asp = 1, pch = 16)

## lo contains the relocations of wild boars
rast <- ascgen(lo, cellsize = 100)
image(rast)

## Alternatively, one can specify the size of the square raster map
rast <- ascgen(lo, nrcol = 10)
rast
image(rast)

## can be used for further analyses
## (e.g. correspondence analyses)
locs <- puechabon$locs[, c("Name", "X", "Y")]
o <- count.points.id(locs[,2:3], locs[,1], rast)
image(o)

adehabitat documentation built on Jan. 28, 2018, 5:02 p.m.