Data



Data Notes



Extracted from Database

22 Apr 2019

SIMONS BAY

WARNING: QCFLAG EXISTS. PLEASE READ THE DOCUMENTATION.

Station Information

Station ID: 826
Latitude: -34.187778
Longitude: 18.440139
GLOSS ID: 268
Coastline code: 430
Station code: 61
Country: SOUTH AFRICA
Time span of RLR data: 1957 – 2016
RLR completeness (%): 77
Time span of metric data: 1957 – 2016
Metric completeness (%): 78
Date of last update: 09 Jan 2019

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Tide Gauge Data

Plot of monthly mean sea level data at SIMONS BAY.

Link to larger image of monthly data plot.
Download monthly mean sea level data.

Plot of annual mean sea level data at SIMONS BAY.

Link to larger image of annual data plot.
Download annual mean sea level data.

Download metric sea level data. Use only with extreme caution.
NOTE: If some of the data are red in the plots above, the 'flag for attention' is set. Please see the documentation below.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: SIMO
Fast Delivery Data from UHSLC station 221: hourly and daily
Research Quality Data from UHSLC station 221: hourly and daily

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Simons Bay 430/061 RLR(1964) is 9.6m below BMZZZ

Documentation added 1996-08-28

For discussions of MSL changes and extreme sea levels around Namibia and South Africa, see: G.B.Brundrit, S.Afr.J.Mar.Sci.,16,9-17,1995 and S.Searson and G.B.Brundrit, S.Afr.J.of Science, 91,579-588,1995. 1957 - 1972 VALUES BASED ON 8 READINGS PER DAY

Documentation added 2000-06-14

Data for Jan-April 1990 removed as suspect.

Documentation added 2009-09-24

Heights of chart datum relative to land levelling datum LLD(MSL)in South Africa and Namibia: Simons Town (Bay) Datum: 1st Jan 1973 - 31st Dec 1978 = -0.651 Datum: 1st Jan 1979 - 31st Dec 1997 = -0.900 Datum: 1st Jan 1998 - 31st Dec 2002 = -1.003 Datum: 1st Jan 2003 onwards = -0.843 Datum is now LAT so unlikely to change.

Data Authority

Hydrographic Office
Maritime Headquarters
Private Bag X1
Tokai 7966