QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 02 Dec 2019
              Station  : Alofi                     Latitude:  19 03.0S          
              Country  : Niue                     Longitude: 169 55.0W          
              JASL #   : 598A                 Time Meridian: 180E (GMT + 12 hr) 
              GLOSS #  : none Originator #: ID070015 NODC #: 31916901           
              Contributor  : National Tidal Centre, Bureau of Meteorology
                             PO Box 421
                             Kent Town SA 5071 South Australia
                             AUSTRALIA 
              Originator   : same 
              Original Data: digital
              Instrmnt Type: Aquatrak acoustic (SEAFRAME) 
              Digitzd Intvl: 6 minutes (average of 181 one minute samples)
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : Cosine-Lanczos filter with cutoff of 120 min. 
                    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 : 08 Aug 2015 - 31 Dec 2018
              Gaps > 1 mon : none
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes      
              Sat. Trans.  : Yes                 Distribution        : 2015-2018
              Refernce Levl: All heights have been referred to the station 
                             Tide Gauge Zero (TGZ), which is linked to fixed 
                             bench marks.  
              Comment      : Comparison of daily means with Suva suggest a 
                             stable reference level.
                             
                             SPECIAL NOTE TO USERS OF NAT. TIDAL CENTRE DATA:
                             As a user of this information, you are deemed
                             to have read and accepted the conditions described
                             in the Copyright Notice and Disclaimer at:
                             http://www.bom.gov.au/other/copyright.shtml

                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              2015  41 none                 none            none
              2016  99 359-360              none            none
              2017  98 32-37,173-174,       (15)180-(00)181 none
                        185-187             (14)184-(22)184
              2018 100 none                 none            none