pointer.to.maps.xy.time
pointer.to.maps.xyz.time(wpath, map.prefix = "thetaliq",
suffix = "L%04dN%04d.asc", zoo.index = NULL, ntime,
nlayers)"L%04dN%04d.asc" for xy+z+time maps or
"N%04d.asc" for xy+time maps.NULL , otherwise function returns a zoo object
with zoo.index as index.zoo.index
is not NULL, it is calculated from
zoo.index length.