| lowres {adehabitat} | R Documentation |
lowres is a generic function, having methods for the classes
asc and kasc. It is used to reduce the resolution of
the maps.
lowres(x, np = 2, ...)
x |
an object of class asc or kasc |
np |
a number giving the number of pixels to merge together (see below) |
... |
further arguments passed to or from other methods |
The function merges together squares of np * np pixels. For
maps of type "numeric" (see
help(asc)), the function averages the value of the variable.
For maps of type "factor", the function gives the most
frequent level in the square of np * np pixels. When several
levels are equally represented in the square of np * np pixels,
the function randomly samples one of these levels.
Returns an object of class asc or kasc.
Clement Calenge calenge@biomserv.univ-lyon1.fr
asc and kasc for further
information on objects of class asc and kasc
respectively.
data(puechabon) kasc <- puechabon$kasc ## The initial image image(kasc) ## The transformed image m <- lowres(kasc, np = 4) image(m)