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  2. Tide gauge - Wikipedia

    en.wikipedia.org/wiki/Tide_gauge

    A tide gauge The tide gauge in Kronstadt, Russia [1] A tide gauge is a device for measuring the change in sea level relative to a vertical datum. [2] [3] It is also known as a mareograph, [4] marigraph, [5] and sea-level recorder. [6] When applied to freshwater continental water bodies, the instrument may also be called a limnimeter. [7] [8]

  3. National Geodetic Vertical Datum of 1929 - Wikipedia

    en.wikipedia.org/wiki/National_Geodetic_Vertical...

    The datum was defined by the observed heights of mean sea level at the 26 tide gauges and by the set of elevations of all bench marks resulting from the adjustment of observations. The adjustment required a total of 66,315 miles (106,724 km) of levelling with 246 closed circuits and 25 circuits at sea level.

  4. Permanent Service for Mean Sea Level - Wikipedia

    en.wikipedia.org/wiki/Permanent_Service_for_Mean...

    The tide gauge data are freely accessible by all, and consist predominantly of monthly-mean and annual-mean sea levels. The primary,"Revised Local Reference" data set has a continuous history of benchmark surveys for each gauge, ensuring that sea level is measured relative to a known land-based datum.

  5. Chart datum - Wikipedia

    en.wikipedia.org/wiki/Chart_datum

    A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).

  6. Newlyn Tidal Observatory - Wikipedia

    en.wikipedia.org/wiki/Newlyn_Tidal_Observatory

    Newlyn Tidal Observatory is a grade II listed tide gauge hut on the South Pier in Newlyn, Cornwall in England. Measurements of sea level taken at the observatory between 1915 and 1921 were used to define the reference level, Ordnance Datum Newlyn, for height measurement on the British mainland.

  7. Flood stage - Wikipedia

    en.wikipedia.org/wiki/Flood_stage

    Flood stage is the water level, as read by a stream gauge or tide gauge, for a body of water at a particular location, measured from the level at which a body of water threatens lives, property, commerce, or travel. [1] The term "at flood stage" is commonly used to describe the point at which this occurs.

  8. The One Thing You Have to Do in Every State - AOL

    www.aol.com/one-thing-every-state-130000808.html

    About two hours west of Philadelphia, Gettysburg is where the tide of the Civil War turned against the Confederacy, at a high price: 51,000 soldiers from both sides were killed, wounded, captured ...

  9. Global Sea Level Observing System - Wikipedia

    en.wikipedia.org/wiki/Global_Sea_Level_Observing...

    The research that is provided by GLOSS is important for many things including research into sea level change and ocean circulation, coastal protection during events such as storm surges, providing flood warning and monitoring tsunamis, tide tables for port operations, fisherman, and recreation, to define datums for national or state boundaries.