Tide Analyzer Program - Hypack

Tide Analyzer ProgramBy Christian ShawNew in HYPACK® 2011 is the TIDE ANALYZER program. The program can save out a tidecorrection (*.TID) file from your RAW data files that can be used in post-processing in theSINGLE BEAM EDITOR or in the HYSWEEP® EDITOR (MB Max). It is a good qualitycontrol check for your RTK tides versus predicted tide files and/or manually created tide files.The TIDE ANALYZER will enable you to load the following HYPACK® format files:• .LOG,• .RAW,• .HSX,• .HS2• .TIDFIGURE 1. Tide AnalyzerThere are 4 methods of tide interpolation:• Spline: For sufficiently smooth piecewise-polynomial function.• SG Filter: The main advantage of this approach is that it tends to preserve features of thedistribution such as relative maximum, minimum and width, which are usually 'flattened'by other adjacent averaging techniques.• Median Filter: The median of a finite list of numbers can be found by arranging all theobservations from lowest value to highest value and picking the middle one.• Moving Average: Used with time series data to smooth out short-term fluctuations andhighlight longer-term trends or cycles.September / 2011 1

The deviation values in the graph show how much variation or “dispersion" there is from theaverage (mean, or expected value). This value is derived from the tide records in the RAWfile and calculated versus the manual tide file that was created in the MANUAL TIDESprogram.2