QUALITY ASSESSMENT OF SEA LEVEL DATA by the UH SEA LEVEL CENTER/NATIONAL OCEANOGRAPHIC DATA CENTER JOINT ARCHIVE FOR SEA LEVEL Station : Port Victoria-B Latitude: 04 37.3S Country : Seychelles Longitude: 055 27.5E JASL # : 111B Time Meridian: 060E (GMT + 4 hr) GLOSS # : none TOGA #: I053 NODC #: 30054501 Contributor : UH Sea Level Center 1000 Pope Rd. MSB 317 Honolulu, Hawaii 96822 Originator : UH Sea Level Center in collaboration with Directorate of Civil Avaition P. O. Box 181 Seychelles International Airport Republic of Seychelles ==> and for 1992+ data Seychelles People's Navy Brigade Hydrographique et Topographique des Seychelles P.O. Box 257 Port Victoria REPUBLIC OF SEYCHELLES Original Data: analog (L&S and OTT); digital (F&P) Instrmnt Type: Leupold and Stevens analog gauge except (01/01/1988-12/22/1988) Fischer and Porter Analog-to-Digital Recorder; (1992) OTT Digitzd Intvl: hourly (L&S and OTT ); 15 minutes (F&P) Present Data : Hourly, daily, and monthly values obtained by: Hourly : Original data were spot hourly (L&S); A three- point Hanning filter centered on the hour (F&P) 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 : 28 May 1986 - 31 Dec 1992 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 : 1986-1992 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 : This gauge is located about 100 yards from Port Victoria-A yet it is not levelled to the same bench marks. The daily and monthly means do not reveal any obvious reference level shifts or trends and agree well with the nearest site, Praslin. CI MISSING REPLACED GAPS QUESTIONABLE YEAR (%) DATA OR BAD DATA FLUCTUATIONS ---- --- -------------------- --------------- -------------------- 1986 60 none none 336-338 1987 93 33-35,223-237, none 74-75,104-105,134- 285-295 137,192-195,278, 326-327 1988 99 187-190 none none 1989 94 170-181,240-251 none 37-43 1990 94 44-64,365 none none 1991 97 1-7,141-143, none none 301-303,365 1992 99 366 (13)134-(04)134 none