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-======================================================================
-                    R E A D M E . Y O Y O 
-                    doc: Fri Aug 10 07:07:59 2012
-                    dlm: Fri Oct 19 11:05:29 2012
-                    (c) 2012 A.M. Thurnherr
-                    uE-Info: 56 0 NIL 0 0 72 3 2 8 NIL ofnI
-======================================================================
-
-=Overview=
-
-This README contains notes on how to process data from non-standard
-casts, such as yo-yos (consecutive down-up casts collected at a given
-location without restarting the instruments) and tow-yos (yo-yos
-carried out while vessel is in slow motion).
-
-Processing of yo-yo and tow-yo data requires the following two steps:
-	1. Split the data files into individual down-upcast pairs
-	2. Process the resulting files as described in [README.ProcessData]
-
-It is important to note that yo-yo and tow-yo casts can be full depth
-(i.e. between the sea surface and the sea bed) or partial-depth. If
-absolute velocities (rather than just vertical shear) are required for
-partial-depth casts, the user must make sure that there are either BT
-data or SADCP data available for velocity referencing of each
-down-upcast pair. Essentially this means that each down-upcast pair
-must extend down to near the seabed or up into the depth range where
-SADCP data are available. 
-
-
-=Step 1: Splitting the Data Files=
-
-Both data files must be split between individual down-upcast pairs, i.e.
-whenever the CTD winch switches from up to down.
-
-CTD DATA: First, find the CTD splitting times by plotting depth vs.
-elapsed time. Then, split the CTD data into separate files using any
-text editor. If SeaBird CNV files are use, the same header can be used
-for all output files.
-
-ADCP DATA: There is an ADCP file splitting utility for M$ Windows
-provided by RDI. Alternatively, the length of each ensemble can be read
-from the binary ADCP files and the UN*X utilities "split -b" and "cat"
-can be used to split the files into the required chunks.
-
-
-=Step 2: Processing the Split Data Files=
-
-The split data files, each containing data from exactly one consecutive
-down- and up-cast, can be processed exactly as described in
-[README.ProcessData]. If the CTD time-series data used during
-processing has an "elapsed-time" field all output elapsed times are
-consistent with this input, i.e. the elapsed times of the output casts
-are relative to the beginning of the entire yo-yo or tow-yo cast.
-Otherwise, every down-/up-cast pair gets its own elapsed-time field.
-
-Usually, in standard LADCP processing the velocity data from the down-
-and upcast are combined. While this smears out any information on the
-temporal variability of the velocity field during the cast, down- and
-upcast only profiles are necessarily derived from much fewer samples
-and, therefore, associated with considerably larger uncertainties and
-errors. It has been found, in particular, that the top-to-bottom shear
-in down-/upcast-only profiles is often quite bad. In the context of
-partial-depth yo-yo and tow-yo profiles the severity of this problem
-can be evaluated by comparing two consecutive velocity profiles at
-their "unconstrained" end. E.g., in case of a partial-depth yo-yo near
-the seabed, i.e. constrained with BT data, the uppermost portion of the
-first upcast can be compared to the uppermost portion of the 2nd
-downcast, etc. If the errors are found to be unacceptably high, the
-velocity profiles from the combined down-/upcast data should be used
-instead. Alternatively, multiple simultaneous velocity referencing
-constraints can be applied, e.g. using the shear-inversion method
-described by Thurnherr (JAOT 2010).
-
-