TideData

TideData[spec]

returns the tidal properties for a location or a set of tidal parameters.

TideData[spec,prop]

returns the specified property for the location or tidal parameters indicated.

TideData[spec,prop,datespec]

returns the value of a specified property for a date or set of dates.

Details and Options

  • spec can be a location, tide station, a TimeSeries of tidal heights or an association with keys corresponding to the tidal modes, mean tide level and elevation.
  • For spec that encompass regions, the center of that region is used to determine the tide station.
  • Tide stations include both physical tide stations along the coast and tidal information for a grid of points derived from satellite data.
  • TideData does not provide accurate results for inland locations, rivers or lakes.
  • TimeSeries input is analyzed to determine the best-fit values for tidal modes, which are then used for further calculations.
  • Tidal modes should be specified as an ordered pair of amplitude and phase. If not specified, they are assumed not to contribute.
  • Amplitudes and heights can be specified as Quantity objects. If numbers, they are presumed to be in feet.
  • Phases should be Quantity objects or numbers specifying angular degrees.
  • The tidal constituents and their symbols are:
  • "M2"M2principal lunar semidiurnal constituent
    "S2"S2principal solar semidiurnal constituent
    "N2"N2larger lunar elliptic semidiurnal constituent
    "K1"K1lunar diurnal constituent
    "M4"M4shallow water overtides of principal lunar constituent
    "O1"O1lunar diurnal constituent
    "M6"M6shallow water overtides of principal lunar constituent
    "MK3"MK3shallow water terdiurnal constituent
    "S4"S4shallow water overtides of principal solar constituent
    "MN4"MN4shallow water quarter diurnal constituent
    "NU2"ν2larger lunar evectional constituent
    "S6"S6shallow water overtides of principal solar constituent
    "MU2"MU2variational constituent
    "2N2"2"N2lunar elliptical semidiurnal second-order constituent
    "OO1"OO1lunar diurnal constituent
    "LAM2"λ2smaller lunar evectional constituent
    "S1"S1solar diurnal constituent
    "M1"M1smaller lunar elliptic diurnal constituent
    "J1"J1smaller lunar elliptic diurnal constituent
    "MM"Mmlunar monthly constituent
    "SSA"Ssasolar semiannual constituent
    "SA"Sasolar annual constituent
    "MSF"Msflunisolar synodic fortnightly constituent
    "MF"Mflunisolar fortnightly constituent
    "RHO"ρlarger lunar evectional diurnal constituent
    "Q1"Q1larger lunar elliptic diurnal constituent
    "T2"T2larger solar elliptic constituent
    "R2"R2smaller solar elliptic constituent
    "2Q1"2Q1larger elliptic diurnal constituent
    "P1"P1solar diurnal constituent
    "2SM2"2SM2shallow water semidiurnal constituent
    "M3"M3lunar terdiurnal constituent
    "L2"L2smaller lunar elliptic semidiurnal constituent
    "2MK3"2"MK3shallow water terdiurnal constituent
    "K2"K2lunisolar semidiurnal constituent
    "M8"M8shallow water eighth diurnal constituent
    "MS4"MS4shallow water quarter diurnal constituent
  • A location can be specified by latitude/longitude pairs, assuming degrees as units, a GeoPosition specification or Entity objects, assuming they represent objects with geographic coordinates.
  • Location-specific properties include:
  • "Coordinates"coordinates of tide station
    "DateEstablished"date tide station established
    "DateInstalled"date tide station installed
    "DateRemoved"date now-defunct tide station removed
    "GreatDiurnalRange"difference between "MeanHigherHighWater" and "MeanLowerLowWater"
    "HighestWaterLevelOnStationDatum"highest recorded water level
    "LowestWaterLevelOnStationDatum"lowest recorded water level
    "MeanDiurnalHighWaterInequality"average difference in height between high tides
    "MeanDiurnalLowWaterInequality"average difference in height between low tides
    "MeanDiurnalTideLevel"average of "MeanHigherHighWater" and "MeanLowerLowWater"
    "MeanHigherHighWater"average highest high tide of the day
    "MeanHighWater"average of high tides
    "MeanLowerLowWater"average lowest low tide of the day
    "MeanLowWater"average of low tides
    "MeanSeaLevel"average water level
    "Position"coordinates of the location
    "Station"tide station Entity used
    "StationDistance"distance to tide station used
    "StationName"name of tide station used
  • Calculated properties include:
  • "DurationOfFall"interval from next high tide to next low tide
    "DurationOfRise"interval from next low tide to next high tide
    "HighestAstronomicalTide"highest possible predicted tide based on model
    "HighHighTide"highest high tide for the day's predicted time and height
    "HighLowTide"highest low tide for the day's predicted time and height
    "HighNeapTide"next high neap tide's predicted time and height
    "HighPerigeanSpringTide"next high perigean spring tide's perdicted time and height
    "HighSpringTide"next high spring tide's predicted time and height
    "HighTide"next high tide's predicted time and height
    "LowestAstronomicalTide"lowest possible predicted tide based on model
    "LowHighTide"lowest high tide for the day's predicted time and height
    "LowLowTide"lowest low tide for the day's predicted time and height
    "LowNeapTide"next low neap tide's predicted time and height
    "LowPerigeanSpringTide"next low perigean spring tide's predicted time and height
    "LowSpringTide"next low spring tide's predicted time and height
    "LowTide"next low tide's predicted time and height
    "LunatidalInterval"interval from next lunar transit to next high or low tide
    "TideType"classification of tidal behavior
    "WaterLevel"current water level relative to the mean
  • General properties include:
  • "Elevation"elevation
    "HarmonicAmplitudes"amplitudes of harmonic constituents for input
    "HarmonicPhases"phases of harmonic constituents for input
    "MeanTideLevel"average level of tide
  • Universal harmonic constituent properties include:
  • "HarmonicNames"names of harmonic constituents
    "HarmonicSpeeds"angular speeds of harmonic constituents
  • All heights are measured relative to the tide station datum or fixed-base elevation, often the zero of the first tide staff installed.
  • datespec should be specified as a specific time using a date list, a DateObject or as a string in DateString format.
  • datespec can also be specified as {start,end,increment} for compatibility with DateRange specifications. increment can be any valid DateRange increment. A datespec of {start, end} uses an increment of "Minute".
  • Times are returned in either the local time zone or the time zone of the location specified.
  • Results are based on historical measurements and do not account for current weather or ocean level changes.
  • The option UnitSystem is available for controlling the units of the results. The following settings can be used:
  • "Imperial"return results in imperial units
    "Metric"return results in metric units

Examples

open allclose all

Basic Examples  (3)

Learn the time and predicted height for the next high tide:

Discover the first high spring tide of a month:

Plot the change in water levels over time:

Scope  (6)

Examine all available properties:

Find the tide station used for a particular location:

Examine when the station was established:

Calculate how far the station is from the location:

Uncover the range between the mean high and low tides:

Compute the properties of a tide station:

Determine the properties of the next low tide based on a GeoPosition:

Examine the harmonic amplitudes and phases used to determine the tides at a particular location:

Calculate the next low tide based on a set of tidal constituents:

Options  (1)

UnitSystem  (1)

Control whether results are returned in metric or imperial units:

Changing units can also be accomplished with UnitConvert:

Applications  (5)

Examine how the monthly oscillations compare to historic and average high and low tides:

Find the most extreme tide levels on record and the averages for a particular station:

Compare these with the monthly oscillations:

Explore how tidal constituents contribute to the overall tide:

Explore how high tides adjust with the phase of the Moon:

Observe the progression of high tides along the Eastern Seaboard:

Discover the range of the tides in the San Francisco Bay Area:

Possible Issues  (1)

Results are not available for inland locations:

Neat Examples  (2)

Visualize the harmonic periods of the tidal constituents:

Examine the amplitudes for each of the harmonic constituents for Daytona Beach versus their periods:

Examine the distribution of water levels at noon across a 19-year period:

Wolfram Research (2017), TideData, Wolfram Language function, https://reference.wolfram.com/language/ref/TideData.html (updated 2019).

Text

Wolfram Research (2017), TideData, Wolfram Language function, https://reference.wolfram.com/language/ref/TideData.html (updated 2019).

CMS

Wolfram Language. 2017. "TideData." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2019. https://reference.wolfram.com/language/ref/TideData.html.

APA

Wolfram Language. (2017). TideData. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TideData.html

BibTeX

@misc{reference.wolfram_2024_tidedata, author="Wolfram Research", title="{TideData}", year="2019", howpublished="\url{https://reference.wolfram.com/language/ref/TideData.html}", note=[Accessed: 21-November-2024 ]}

BibLaTeX

@online{reference.wolfram_2024_tidedata, organization={Wolfram Research}, title={TideData}, year={2019}, url={https://reference.wolfram.com/language/ref/TideData.html}, note=[Accessed: 21-November-2024 ]}