QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                                                                
              Station  : Lagos-C                   Latitude:  06 25.4N          
              Country  : Nigeria                  Longitude: 003 24.7E          
              JASL #   : 233C                 Time Meridian: 015E (GMT + 1 hour)
              GLOSS #  : 259  Originator #:7641400   NODC #: 10006301           
              Contributor  : Nigerian Institute for Oceanographic and 
                             Marine Research                                    
                             Victoria Island, P. M. B. 12729, Lagos             
                             NIGERIA                                            
              Originator   : same
              Original Data: digital
              Instrmnt Type: Aquatrak acoustic gauge, NOAA Next Generation 
                             Water Level Measuring System (NGWLMS)
              Digitzd Intvl: 6 minute (each sampling is three-minute average)
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : spot on hour
                    Daily  : 119-point convolution filter (Bloomfield, 1976)    
                             centered on noon applied to the hourly data        
                             with respective periods of the 95, 50, and 5%      
                             amplitude points at 124.0, 60.2, and 40.2 hours    
                    Monthly: Simple average of all daily values; calculated if  
                             7 or fewer days are missing                        
              Span of data : 02 Aug 1992 - 06 Oct 1996
              Gaps > 1 mon : 12 Sep 1992 - 21 Oct 1992;01 Sep 1994 - 01 Dec 1996
              Time Refernce: GMT (00-23 hours)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes      
              Sat. Trans.  : No                  Distribution        : 1992-1996
              Refernce Levl: The data are relative to the tide staff zero which
                             is linked to a set of fixed bench marks.  Geodetic
                             leveling information is available from the 
                             originators.
              Comment      : The timing is very good and no obvious level
                             shifts are present.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1992  22 234-242,256-295,306- (10)365-(23)365 none
                       314,337-348
              1993  86 23-31,57-74,80-90,   (00)016-(20)016 none
                       150-157,189-192,
                       334-342
              1994  72 4-9,65-71,73-75,     none            none
                       244-335
              1995  80 37-50,61-71,193-210, none            none
                       265-271,279-304,338-
                       340,361-364
              1996  50 27-31,94-121,162-    (06)009-(23)009 none
                       215,245-259