A Comparison of Datums Derived from CO-OPS Verified Data Products and Tidal Analysis Datum Calculator.
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The NOAA National Ocean Service Center for Operational Oceanographic Products and Services (CO-OPS) has developed a publicly accessible tool to compute tidal datums from water level data with a variety of tidal signals. The Tidal Analysis and Datums Calculator (TAD) uses a Butterworth digital filter to remove high frequency (> 4 cycles/day) water level variability in order to identify tidal high and low waters from observed water level data. Present CO-OPS procedure uses a Curve Fit Manual Verification (CFMV) approach to identify tidal high and low waters. A comparison of high and low water selections at eight long-term NOAA water level stations shows that the mean difference between selections made by TAD and CFMV have a mean bias of 0 at the 1 mm level, and the standard deviations of the differences are all within CO-OPSaccepted data processing error bounds. Instances of major differences (> 0.02 m) between individual high and low water selections are rare and have no sign.....
PublisherNOAA, NOS Center for Operational Oceanographic Products and Services
Silver Spring, MD
Series;NrNOAA Technical Report NOS CO-OPS;085
Essential Ocean Variables (EOV)Sea surface height
Best Practice TypeBest Practice
CitationLicate, L.A.; Huang, L. and Dusek, G, (2017) A Comparison of Datums Derived from CO-OPS Verified Data Products and Tidal Analysis Datum Calculator. Silver Spring, MD, NOAA NOS Center for Operational Oceanographic Products and Services, 18pp. (NOAA Technical Report NOS CO-OPS 085). DOI: http://dx.doi.org/10.25607/OBP-146
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