COSMAP_OPEN - open a big image

SUBROUTINE COSMAP_OPEN ( NAME, ACCESS, BD, STATUS ) 

   NAME = CHARACTER*(*) (given)
            directory name for big image
   ACCESS = CHARACTER*(*) (given)
            access mode "read" or "update"
   BD = INTEGER (returned)
            bigimage descriptor
   STATUS = INTEGER (given and returned)
            global status