QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                                                                
              Station  : Easter-D                  Latitude:  27 09.0S          
              Country  : Chile                    Longitude: 109 26.9W          
              JASL #   : 022D                 Time Meridian: 105W (GMT - 7 hr)  
              GLOSS #  : 137  Originator #:0305      NODC #: 52107901           
              Contributor  : UH Sea Level Center                              
                             1000 Pope Rd. MSB 317                              
                             Honolulu, Hawaii 96822                             
              Originator   : Dept. of Oceanography                              
                             University of Hawaii                               
                             1000 Pope Rd. MSB 317                              
                             Honolulu, Hawaii 96822                             
              Original Data: digital                                            
              Instrmnt Type: Fischer and Porter Analog-to-Digital Recorder      
              Digitzd Intvl: 15 minutes                                         
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : Nine-point triangular filter centered              
                             on the hour with respective periods of the 95, 50, 
                             and 5% amplitude point of the filter response at   
                             623.6, 177.0, and 103.7 minutes                    
                    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 : 22 Mar 1977 - 07 Aug 1984                          
              Gaps > 1 mon : 1 Jan - 1 Feb 1979; 1 Feb - 1 Mar 1983             
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : No                  Operational         : No       
              Sat. Trans.  : No                  Distribution        : 1977-1984
              Refernce Levl: All heights have been referred to the station tide 
                             staff zero which is linked to fixed bench marks;   
                             however, these bench marks are not linked to the   
                             bench marks used by other tide records at this     
                             site.  Thus, this data set is independent.         
              Comment      : The daily and monthly means reveal no apparent     
                             changes in the reference level.  Large deviations  
                             with a period from 1 to 3 days occur during the    
                             winter season associated with weather events.      
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1977  77 282-283              none            150,157,351         
              1978 100 none                 none            none                
              1979  89 1-32,135-139,        none            none                
                       362-365                                                  
              1980  99 1,247-250            none            138                 
              1981 100 none                 none            none                
              1982  99 65-67                none            none                
              1983  92 32-60                none            none                
              1984  58 121-128              none            none