file title  : Land/Sea Mask
id type     : integer
file type   : binary
object type : polygon
ref. system : latlong
ref. units  : rad
unit dist.  : 1
min. X      : -180.2449951
max. X      : 180.2449951
min. Y      : -90.2449951
max. Y      : 83.7314072
pos'n error : unknown
resolution  : unknown