QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 19 Dec 2023
              Station  : Vung Ang                  Latitude:  18 05.0N
              Country  : Vietnam                  Longitude: 106 17.0E          
              JASL #   : 651A                 Time Meridian: 105E (GMT + 7 hr) 
              GLOSS #  : none     TOGA #: none       NODC #: 11108601
              Contributor  : Transport Engineering Design Incorporation
                             278 Ton Duc Thang Street
                             Hanoi
                             VIETNAM
              Originator   : unconfirmed
              Original Data: analog
              Instrmnt Type: float/well with paper roll recording mechanism
              Digitzd Intvl: hourly
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : spot digitization on the 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 : 03 Sep 1996 - 31 Aug 1997
              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.  : No                  Distribution        : 1996-1997
              Refernce Levl: All heights have been referred to the station tide 
                             staff zero which is linked to fixed benchmarks.
              Comment      : The daily  and monthly means reveal no apparent    
                             changes in the reference level.  The high values
                             Sep-Dec 1996 are suspicious but may be weather 
                             related.  The residuals show high-frequency
                             jitter during Sep 1996 for unknown reasons. The
                             timing appears to be of better quality in 1997.
                             Dec 2023 - The timeseries was corrected so that
                             data are now on GMT.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1996  33 none                 none            316-326,308,317-330
              1997  66 none                 none            none