QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       Updated: 30 Apr 2020
              Station  : Port Sonara               Latitude:  04 00.4N          
              Country  : Cameroon                 Longitude: 009 07.6E          
              JASL #   : 816A                 Time Meridian: 015E (GMT + 1 hr)  
              GLOSS #  : 350      TOGA #: A035       NODC #: 30004901           
              Contributor  : British Oceanographic Data Centre (BODC)
                             Joseph Proudman Building
                             6 Brownlow Street
                             Liverpool L3 5DA
                             United Kingdom
              Originator   : Societe National de Raffinage
              Original Data: digital
              Instrmnt Type: OTT Kalesto radar sensor
                             2 x OTT ODS4-K pressure sensor (backup)
              Digitzd Intvl: 1 or 3 min
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : unconfirmed
                    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 : 23 Jun 2008 - 25 Jun 2011
              Gaps > 1 mon : 20 Jul 2008 - 20 Sep 2008;21 Jun 2010 - 27 Aug 2010
              Time Refernce: GMT (00-23 hours)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes
              Sat. Trans.  : Yes                 Distribution        : 2008-2011
              Refernce Levl: The tide gauge has not yet been levelled into the
                local benchmark network, so data are uncalibrated heights from
                the Kalesto sensor.
                Benchmark             Description
                Foundation (pile 21)  Top of foundation where tide gauge is 
                                      located
                Datum Relationships:
                Estimated Chart Datum = 4.2m below top of Foundation (pile 21)
              Comment      : 1) BODC notes: Amplitudes and phases of main
                tidal constituents have been compared with previously
                calculated values. Records have been visually inspected for
                spikes, datum shifts and timing errors.
                2) JASL: gaps 24 hour or less were interpolated at the JASL.  

                The tide gauge is located in the Sonara company harbour, 
                close to Port Lime, on a foundation.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              2008  29 202-264,272-276,295- none            none
                       299,336-350
              2009  94 72-76,133-145,255-   (23)187-(20)188 none
                       258,282-285          (16)227-(23)227
                                            (14)228-(06)229
              2010  79 156-165,172-239      (18)061-(15)062 none
                                            (13)089-(04)090
              2011  47 none                 (19)064-(08)065 none
                                            (11)102-(23)102