UTide Unified Tidal Analysis and Prediction Functions

Sea level & vector current; irregular times; confidence intervals; constituent selection diagnostics

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Unified Tidal Analysis and Prediction Using the “UTide” Matlab Functions

* Designed specifically to handle record times that are irregularly distributed and/or gappy.

* Suitable for multi-year analyses: accurate nodal/satellite corrections are not limited to record lengths shorter than 1-2 years.

* Can provide easy-to-use and comprehensive diagnostics to aid the constituent selection process.

* Handles sea level (amplitude and phase), or currents (current ellipse parameters), with similar syntax.

* Generates confidence intervals based on spectra (FFT for regular times, Lomb-Scargle for irregular times) of the residuals between the raw input and the harmonic fit.

* Incorporates the robust L1/L2 solution method to minimize influence of outliers.

* Enables analysis of groups of time sequences (such as records from an array of instruments, or from a group of model gridpoints) with one m-function call.

* Builds on, and integrates in to a common framework, the t_tide (Pawlowicz et al 2002), r_t_tide (Leffler and Jay 2009), and "versatile" (Foreman et al 2009) approaches.

* Flexible interface with mix-and-match choices of analysis configurations accessible by arguments to m-functions.

* Download the m-files together with the technical report / user’s manual describing them here: ftp://www.po.gso.uri.edu/pub/downloads/codiga/utide/UTideCurrentVersion.zip

Technical Report / User’s Manual:
Codiga, D.L., 2011. Unified Tidal Analysis and Prediction Using the UTide Matlab Functions. Technical Report 2011-01. Graduate School of Oceanography, University of Rhode Island, Narragansett, RI. 59pp.
ftp://www.po.gso.uri.edu/pub/downloads/codiga/pubs/2011Codiga-UTide-Report.pdf

Also note:

1. The file UTideCurrentVersion.zip, containing the m-files, is also available at ResarchGate (researchgate.net)

2. For a python adaptation see: https://github.com/wesleybowman/UTide