QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 06 Dec 1999
              Station  : Jolo                      Latitude:  06 04.0N          
              Country  : Philippines              Longitude: 121 00.0E          
              JASL #   : 373A                 Time Meridian: 120E (GMT + 8 hr)  
              GLOSS #  : 070      TOGA #: P008       NODC #: 10126101           
              Contributor  : National Mapping Resource Information Authority
                             Coast and Geodetic Survey Department
                             421 Barraca St. San Nicolas 1010
                             Manila, Philippines
              Originator   : same                                               
              Original Data: analog                                             
              Instrmnt Type: A.OTT, gravity type                                
              Digitzd Intvl: one hour                                           
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : The original digitizing interval was hourly        
                    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 1984 - 31 Dec 1995
              Gaps > 1 mon : 31 Mar 1984 - 01 Apr 1984;07 Apr 1985 - 31 Jul 1985
                             23 Dec 1985 - 28 Jan 1986;06 Feb 1987 - 01 Apr 1987
                             27 Apr 1987 - 07 Jun 1987;31 Jan 1990 - 28 Feb 1990
                             02 Jul 1990 - 23 Aug 1990;01 May 1991 - 31 Aug 1991
                             07 May 1995 - 27 Aug 1995
              Time Refernce: GMT (hours 00-23)   Space-filler Flag   :-9999     
              Units        : millimeters         Missing Data Flag   : 9999     
              Existing     : Yes                 Operational         : Yes      
              Sat. Trans.  : No                  Distribution        : 1984-1995
              Refernce Levl: All data are referred to a historic fixed          
                             bench mark (1951)                                  
              Comment      : The daily or monthly means do not reveal any       
                             reference level shifts and agree well with Davao.  
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1984  91 91-122               none            none                
              1985  66 97-212,357-365       none            29-30,306,318,320,  
                                                            328                 
              1986  92 1-28                 none            88-90,253,358       
              1987  74 37-91,117-158        none            106-108             
              1988  95 140-160              none            none                
              1989 100 none                 none            8-12,229,254,336,   
                                                            353-354             
              1990  78 31-59,183-235        none            none
              1991  66 121-243,313-314      (09)117-(23)117 none
                                            (11)322-(01)323
                                            (10)344-(01)345
              1992 100 none                 none            none
              1993 100 none                 none            none
              1994 100 none                 none            none
              1995  69 127-239,365          none            none