OCL/NODC CODES USED IN THE WORLD OCEAN DATABASE 1998.

 OCL CODES ARE THE SAME AS THOSE USED BY NODC EXCEPT WHERE AN NODC
 CODE IS A CHARACTER VALUE IN WHICH CASE OCL ASSIGNS A NUMERIC 
 EQUIVALENT. THE NODC CODE IS IN PARENTHESIS IF DIFFERENT FROM THE
 OCL CODE.

 FIRST NUMBER: OCL CODE
 SECOND NUMBER: NODC CODE
 THIRD NUMBER: CODE DESCRIPTION
                                  
     35   0612   DIGITIZATION METHOD
     --   ----   --------------------
      1        -- MANUAL
      2        -- A-D CONVERSION FROM ORIGINAL
      3        -- A-D CONVERSION FROM COPIES
      4        -- OPTICAL SCANNING
      5        -- DIRECT DIGITAL OUTPUT UNKNOWN
      6        -- DIRECT DIGITAL OUTPUT BATHY
      7        -- DIRECT DIGITAL OUTPUT SUTRON
      8        -- DIRECT DIGITAL OUTPUT FROM SIPPICAN MARK 9