QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 16 May 2002
              Station  : Valdez,AK                 Latitude:  61 07.5N
              Country  : USA                      Longitude: 146 21.7W
              JASL #   : 562A                 Time Meridian: 150W (GMT - 10 hr)
              GLOSS #  : none Originator #:9454240   NODC #: 76141601
              Contributor  : National Ocean Service (NOS)                       
                             National Ocean. and Atmos. Administration (NOAA)   
                             N/OES22
                             SSMC4, STATION 7109
                             1305 East West Highway
                             Silver Spring, MD. 20910-3233
              Originator   : same
              Original Data: digital 
              Instrmnt Type: Aquatrak acoustic gauge, NOAA Next Generation 
                             Water Level Measuring System (NGWLMS) 
              Digitzd Intvl: six-minute 
                             NGWLMS sampling is three-minute average
              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 1996 - 31 Dec 2000
              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        : 1996-2000
              Refernce Levl: All heights have been referred to the station tide 
                             staff zero which is linked to fixed bench marks. 
                             While standard mechanical or ADR instrument was the
                             primary gauge, leveling calibration factors were
                             applied monthly based on tide staff comparisons.
              Comment      : The daily and monthly means reveal no apparent     
                             reference level changes.  This site is referred
                             to as "Valdez, Prince William Sound, AK" by the
                             originators.

                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              1996 100 none                 none            none
              1997 100 none                 none            none
              1998 100 none                 none            none
              1999 100 none                 none            none
              2000 100 none                 none            none