QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 13 Apr 2011
              Station  : La Union-B                Latitude:  13 20.0N
              Country  : El Salvador              Longitude: 087 49.0W
              JASL #   : 086B                 Time Meridian: 090W (GMT - 6 hr) 
              GLOSS #  : none     TOGA #: none       NODC #: 71083701
              Contributor  : Instituto Geografico Nacional                      
                             Apartado 247                                       
                             Avenida Juan Bertis 79, Delgado                    
                             San Salvador, El Salvador                          
              Originator   : same
              Original Data: analog
              Instrmnt Type: standard float/well
              Digitzd Intvl: hourly
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : spot sampling 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 : 01 Jan 2001 - 31 Dec 2010
              Gaps > 1 mon : 04 Oct 2001 - 23 Aug 2002;20 May 2003 - 12 Oct 2003
                             27 May 2004 - 27 Aug 2004;21 Jun 2005 - 17 Feb 2006
                             26 Aug 2007 - 28 Sep 2007
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes
              Sat. Trans.  : Yes                 Distribution        : 2001-2010
              Refernce Levl: All heights have been referred to the station tide 
                             staff zero which is linked to fixed bench marks.
                             An obvious reference level shift was corrected
                             based on analysis of residuals by adding 1500 mm
                             to 00Z 01 Jan 2001 - 23Z 07 Aug 2001.
              Comment      : Timing is poor for 2001-16 Jan 2005
                          
                             La Union-A is separate from La Union-B due to
                             a difference in reference levels.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              2001  74 1,180-182,187-189,   (11)067-(19)067 see comment above
                       260-262,277-365      (23)079-(19)080
                                            (23)088-(07)089
                                            (23)089-(07)090
                                            (11)098-(19)098
                                            (14)110-(23)110
                                            (23)127-(07)128
                                            (23)133-(19)134
                                            (23)154-(07)155
                                            (23)174-(19)175
                                            (23)208-(07)209
                                            (23)230-(07)231
                                            (23)239-(07)240
                                            (11)250-(19)250
                                            (08)268-(19)268
                                            (08)271-(19)271
              2002  36 1-235                (05)278-(20)278 see comment above
              2003  59 111-113,140-285,     none            see comment above
                       322-324
              2004  75 148-240              (04)316-(12)316 see comment above
                                            (09)317-(16)317
              2005  42 17-28m32-36,43-44,   (17)029-(00)030 see comment above
                       49-50,172-365        (12)030-(03)031
                                            (16)031-(02)032
                                            (08)036-(20)036
                                            (19)037-(08)038
                                            (18)041-(04)042
                                            (06)042-(23)042
                                            (17)044-(10)045
                                            (18)045-(02)046
                                            (01)048-(10)048
                                            (16)050-(13)051
                                            (17)051-(08)052
                                            (17)052-(00)053
                                            (05)054-(12)054
                                            (02)055-(10)055
                                            (01)056-(09)056
                                            (11)056-(18)056
              2006  78 1-48,52-53,61-65,70- (06)054-(18)054 none
                       76,91-97,107-109,    (05)102-(02)103
                       122-124,129-133,138-
                       143,148-151,245-246
              2007  90 18-21,238-271        none            none
              2008  98 171-177              none            none
              2009  88 98-102,132-139,      (23)139-(17)140 none
                       268-280,344-365      (23)140-(16)141
              2010  98 1-6                  none            none