SonTek/YSI
ADVField Software Manual (September 1, 2001) 59
12.3.4. Processing Menu
The Processing Menu contains the following options. Note that all items in this menu affect the
burst statistics file that is used to display your data. See the Recompute Burst Statistics File op-
tion (below) for more information.
• Velocity Coordinate System - Lets you select the coordinate system in which to display ve-
locity data. Options are Beam, XYZ, and ENU. The appropriate toolbar icon stays depressed
for the selected coordinate system.
• User Specified Rotation - When activated, lets you rotate all velocity profiles by a user-
selected angle (0-360°). The User Specified Rotation icon stays depressed as long as the se-
lected rotation is in effect. This feature is useful when analyzing current data along a channel.
• Data Smoothing - Lets you smooth the time-series data using a low-pass, adjacent-averaging
filter. Two filters are available: uniform weighting (Box Filter) and Gaussian distributed
weighting (Gaussian). The amount of filtering can be controlled through the Filter Width and
Filter Limits settings. See Recompute Burst Statistics File (below) if you want your Data
Smoothing changes to become the new baseline for your display of data.
• Data Screening - Lets you discard (mask) a portion of a profile using selected criteria. Selec-
tions include: Discard Range of Samples, Low Amplitude, and Low Correlation. Most selec-
tions let you set either the starting/ending sample or a threshold. See Recompute Burst Statis-
tics File (below) if you want your Data Screening changes to become the new baseline for
your display of data.
• Mean Removal - When activated, this option will subtract the mean from all displayed data.
The mean is calculated based on the full range of samples for the displayed burst. See Re-
compute Burst Statistics File (below) if you want your Mean Removal changes to become the
new baseline for your display of data.
• Data Despiking* - (Available only in ViewHydraPro) When activated, lets you refine readily
apparent data spikes into more meaningful data. You select a range of samples over which to
interpolate the refining of data based on a user-selected standard deviation. The default win-
dow width is 7; the default StdDev is also 7.
• Sound Speed Correction - Lets you correct velocity data for erroneous sound speed that may
have occurred due to an incorrect salinity or temperature data.
• Recompute Burst Statistics File - Executing this option will recompute the burst statistics file
for the currently loaded Hydra data set. Any data smoothing, screening, or mean removal en-
tries you made (see above options) will be included in the new statistics file. In effect, you
will create a new baseline for the display of your data. However, your original .adr data file
will not be modified; only the statistics file will be affected.
• Sensor Calibration Settings - Lets you adjust any calibration settings for the various sensors
(temperature, pressure, external pressure, external sensor 1/2/3, CTD temperature). Calibra-
tion coefficients that are adjustable include offset, slope, and quadratic term.
• SonWave Processing Setup - Lets you set the parameters used to process wave data (available
only in ViewHydraPRO; contact SonTek Sales for details). This feature lets you plot and dis-
play wave data in a variety of formats. Plot types include: 3D-Polar, 3D-Contour, 3D-
Surface, 2D-Time Series, 2D-Spectra. You can also choose to: Show Frequency Spectra,
Show Wave Direction, and Compare 2D Spectra. You are also allowed to modify certain
variables and filters, including: Fmin, Rp Cut Off, NFFT, Window Type (Hanning, Ham-
ming, Cosine, Rectangle, Triangular), Water Depth, Burst Length, Start Burst, End Burst, Di-
rectional Weighting Exponent.
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