ascgen {adehabitat} | R Documentation |
ascgen
creates an object of class asc
using
a set of points.
ascgen(xy = NULL, cellsize = NULL, nrcol = 10, count = TRUE)
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 |
Returns an object of class asc
.
Clement Calenge clement.calenge@oncfs.gouv.fr
asc
for additional information on objects
of class asc
.
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)