QUALITY ASSESSMENT OF SEA LEVEL DATA                
                                           by the                               
                   UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER     
                                 JOINT ARCHIVE FOR SEA LEVEL                    
                                       updated: 12 Jan 2018
              Station  : Colombo-D                 Latitude:  06 56.5N          
              Country  : Sri Lanka                Longitude: 079 51.0E          
              JASL #   : 115D                 Time Meridian: 82.5E (GMT + 5.5)  
              GLOSS #  : 033  Originator #: 115      NODC #: 10076901           
              Contributor  : UH Sea Level Center                              
                             1000 Pope Rd. MSB 317                              
                             Honolulu, Hawaii 96822
              Originator   : UH Sea Level Center in collaboration with
                             National Aquatic Resources Agency                  
                             Crow Island, Mattakkuliya                          
                             Colombo-15                                         
                             SRI LANKA                                          
              Original Data: digital                                            
              Instrmnt Type: 1. 2017- pressure transducer (PRS)
                             2. 2017- radar (RAD) (Vega Vegapuls 62)
                             3. 2017- radar (RA2) (Vega Vegapuls 62)
                             Two SWITCH calibration units.
                             Primary channel used in JASL set:
                             Jan/2017-: RAD
                            *short gaps in primary channel filled with
                             other channels as available; see UHSLC for
                             specific dates
              Digitzd Intvl: 1 min (PRS), 3 min (RAD, RA2)
              Present Data : Hourly, daily, and monthly values obtained by:     
                    Hourly : A three-point Hanning filter centered 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 : 04 Jan 2017 - 05 Sep 2017
              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        : 2017-2017
              Refernce Levl: Heights are referred to the station tide staff 
                             zero, which is linked to land-based benchmarks. 
                             This reference zero is unique to this station and
                             is not an official datum (chart, national, etc.) 
                             and is not relative to local tidal parameters, 
                             such as mean lower low water.  See the Originators
                             for benchmark descriptions, maps, and the geodetic
                             levelling history.
              Comment      : The daily and monthly values do not reveal any     
                             obvious reference level shifts or trends.          
                             This series is separate from 115A and 115B
                             because they are not linked to the same datum.

                             This station was terminated in Oct 2016 and
                             moved to a new location, which has not been
                             geodetically linked.  Thus data from 04 Jan 2017
                             begin a new independent series, 115D.
                                                                                
                    CI MISSING              REPLACED GAPS     QUESTIONABLE      
              YEAR (%) DATA                 OR BAD DATA       FLUCTUATIONS      
              ---- --- -------------------- --------------- --------------------
              2017  67 none                 (10)111-(01)112 none
                                            (11)112-(01)113
                                            (11)113-(02)114
                                            (18)115-(01)116
                                            (10)117-(01)118
                                            (09)118-(02)119