Given an object of class
spatial.neighbor detects spatial units that
have no neighbors (islands).
USAGE:
check.islands(x, remap=F)
REQUIRED ARGUMENTS:
x
an object of class
"spatial.neighbor".
OPTIONAL ARGUMENTS:
remap
logical flag: if there is an island, should we recode the indexing of
the spatial contiguity matrix to eliminate the rows and columns with all
zeroes? That is, should we renumber components
row.id and
col.id of
the spatial neighbor object?
VALUE:
if
remap=FALSE the list of existing islands is returned. Otherwise,
an object of class
"spatial.neighbor" with remapped
row.id and
col.id.
SIDE EFFECTS:
the attribute
"nregion" of the output may differ from that of
x when
remap=T.