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What is a Geotide Analyzer and How Does It Work?

What is a Geotide Analyzer and How Does It Work?

A geotide analyzer is a software tool that performs harmonic analysis of tidal data and generates harmonic constants for a specific location. These constants can then be used to predict the tide levels and currents for any date and time in the future or past. Geotide analyzer is designed for professional hydrographers, surveyors, and engineers who need accurate and reliable tidal information for their projects.

geotide analyzer

In this article, we will explain what a geotide analyzer does, how it works, and what are its benefits and features.

What is harmonic analysis of tidal data?

Harmonic analysis of tidal data is a mathematical technique that decomposes the observed tide signal into a sum of sinusoidal components, each with a known frequency, amplitude, and phase. These components are called harmonic constituents, and they represent the effects of various astronomical and meteorological factors that influence the tide, such as the moon, the sun, the earth's rotation, atmospheric pressure, etc.

By identifying the harmonic constituents of a tide signal at a given location, one can calculate the harmonic constants for that location. These constants are essentially the coefficients that multiply each harmonic constituent in the sum. They describe how much each constituent contributes to the tide signal at that location.

Once the harmonic constants are known, one can use them to reconstruct the tide signal for any date and time by adding up the harmonic constituents with their corresponding constants. This is called tidal prediction, and it allows one to estimate the tide levels and currents at any location where harmonic analysis has been performed.

How does a geotide analyzer work?

A geotide analyzer is a software tool that automates the process of harmonic analysis and tidal prediction. It consists of two main modules: GeoTide Analyzer and GeoTide Predictor.

GeoTide Analyzer takes as input tide gauge data, which are measurements of water level or current at a specific location over a period of time. The data can be imported from various formats, such as comma-delimited or fixed-space ASCII files. The data can also be edited and filtered using graphical tools to remove spikes, outliers, or gaps.

GeoTide Analyzer then performs harmonic analysis on the tide gauge data using one of the predefined tidal schemes, which are sets of harmonic constituents that are commonly used in different regions or applications. The user can also create their own custom tidal scheme by selecting which constituents to include or exclude. GeoTide Analyzer supports both tidal height and tidal stream analysis.

The output of GeoTide Analyzer is a file containing the harmonic constants for the location where the tide gauge data was collected. The file also contains information about the tidal levels (e.g., lowest astronomical tide or LAT, highest astronomical tide or HAT) and flood return periods (e.g., how often a certain water level is exceeded) derived from the harmonic constants.

GeoTide Predictor takes as input the harmonic constants file generated by GeoTide Analyzer and uses it to make tidal predictions for any date and time in the future or past. The user can specify the prediction interval (e.g., hourly, daily, monthly) and output format (e.g., table, graph). GeoTide Predictor can also export the predictions to other formats, such as Microsoft Excel or PDF.

What are the benefits and features of a geotide analyzer?

A geotide analyzer offers several benefits and features for users who need accurate and reliable tidal information for their projects. Some of them are:

  • It is fast and easy to use. It handles each step of harmonic analysis and tidal prediction in an intuitive and user-friendly way.

  • It is compatible with various data sources and formats. It can import tide gauge data from different devices and formats, as well as export predictions to different formats.

  • It is flexible and customizable. It allows users to choose from different tidal schemes or create their own custom scheme. It also allows users to adjust various parameters and settings to suit their needs.

  • It is accurate and reliable. It applies the industry-standard technique of harmonic analysis using Doodson's method. It also incorporates quality control checks and error estimates to ensure the validity of the results.

It is comprehensive and informative. It provides not only tidal predictions but e0e6b7cb5c


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