as.coastline(longitude, latitude, fillable)
latitude
and
longitude
, in which case these values are extracted from the data
frame and the second argument is igclass
"coastline"
(for details, see read.coastline
).read.coastline
cannot read a file, or when
the data have been manipulated.coastline-class
explains the
structure of coastline objects, and also outlines the other functions
dealing with them.