CO-OPS Tidal Analysis Datum Calculator

New Product Features: Flexible data inputs, optional inundation frequency and duration analyses, and daily maximum and minimum water level outputs. View the User Guide to learn more.
  • Data and Resources
    • User Guide Technical Report Tidal Analysis Datum Calculator GitHub CO-OPS Special Publication 1 - Tidal Datums and Their Applications CO-OPS Special Publication 2 - Tidal Datum Computation Handbook CO-OPS Special Publication 3 - Tidal Analysis and Predictions FAQs Datums Page and Associated Information
    Adobe Acrobat Reader

    Datum Calculator Input Parameters


    Supported file format is comma separated value (.csv). Layout of each line: date / time, water level Any consistent time sampling (1-minute, 6-minute, 15-minute, etc.) If your data are unevenly spaced in time, resampling will be done automatically at a detected interval which can be modified by setting the optional parameter above
    Lat
    Lon

    or enter ID:

    Select an optional Control Station for datum analysis by choosing a nearby station from the drop down or entering a station ID directly. If you choose 'No Control Station', tidal datums are computed by arithmetic mean of your data. If you choose a control station, tidal datums are computed by simultaneously comparing to the control station.
    Interactive Map to Locate Control Stations
    Includes monthly plots showing the extracted high and low tides (can increase run time for longer data sets)
    meters
    Display how often and for how long this location experiences high water based on a user-defined threshold Threshold value must be in the same units as input data
    Includes the maximum daily water levels in output data relative to selected datum
    Includes the manimum daily water levels in output data relative to selected datum

     
    Tidal Datum Calculator Product Disclaimer
    The tool provides water level analysis support with computing tidal datums. A tidal datum is a standard elevation defined by a certain phase of the tide and can be used as references to measure local water levels. The accuracy of tidal datum elevations is dependent on the quality of the data input into the tool. The entire risk associated with the results and performance of these data is assumed by the user. This tool should be used strictly as a planning reference and is not appropriate for navigation, establishing land boundaries, permitting or other regulatory purposes.