QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                                                                
              Station  : Praslin                   Latitude:  04 20.6S          
              Country  : Seychelles               Longitude: 055 46.0E          
              JASL #   : 106A                 Time Meridian: 060E (GMT + 4 hr)  
              GLOSS #  : none     TOGA #: none       NODC #: 30054502           
              Contributor  : UH Sea Level Center                              
                             1000 Pope Rd. MSB 317                              
                             Honolulu, Hawaii 96822
              Originator   : UH Sea Level Center in collaboration with
                             Directorate of Civil Avaition                      
                             P. O. Box 181                                      
                             Seychelles International Airport                   
                             Republic of Seychelles                             
              Original Data: analog (L&S); digital (F&P)                        
              Instrmnt Type: Leupold and Stevens analog gauge except            
                             (01/02/1989-27/06/1988) Fischer and Porter         
                             Analog-to-Digital Recorder                         
              Digitzd Intvl: hourly (L&S); 15 minutes (F&P)                     
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : Original data were spot hourly (L&S); A three-     
                             point Hanning filter centered on the hour (F&P)    
                    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 : 05 Nov 1987 - 27 Jun 1989                          
              Gaps > 1 mon : 27 Sep 1988 - 14 Dec 1988                          
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : No       
              Sat. Trans.  : No                  Distribution        : 1987-1989
              Refernce Levl: Heights are referred to the station tide staff 
                             zero, which is linked to land-based benchmarks. 
                             This reference zero is unique to this station and
                             is not an official datum (chart, national, etc.) 
                             and is not relative to local tidal parameters, 
                             such as mean lower low water.  See the Originators
                             for benchmark descriptions, maps, and the geodetic
                             levelling history.
              Comment      : The daily and monthly means do not reveal any      
                             obvious reference level shifts or trends and       
                             agree very well with the nearest station, Port     
                             Victoria.                                          
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1987  16 none                 none            none                
              1988  86 none                 none            none                
              1989  44 none                 none            none