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  • 15. WT Filters

15. WT Filters

The WT Filters button opens a window that allows the user to evaluate the water track data for each transect and change the filter settings. Filter settings are applied to all transects and cannot be set for individual transects.
 
15. WT Filters
1

Summary Table

1. Summary Table
The Summary Table allows the user to select which transect to graph (by clicking on the desired row), provides information on the number of depth cells that have been determined to be invalid by the various filters, and shows the effect of a filter change on the computed discharge. Cells in the table contain color codes associated with cautions or warnings generated from the ADQA. No editable cells are in this table. The columns in the table are:
 
Filename—Filename of the transect.
# Depth Cells—Total number of depth cells in the transect.
% <4 Beams—Number of ensembles that had valid water track in less than 4 beams.
% Invalid Total—Number of ensembles with invalid water track velocity.
% Invalid Orig—Number of ensembles that had invalid water track velocity prior to any filtering.
% Invalid <4 Beams—Number of ensembles with valid water track in less than 4 beams for which the water track velocity has been determined to be invalid.
% Invalid Error Vel—Number of ensembles that have been determined to be invalid due to filtering based on the water track error velocity.
% Invalid Vert Vel—Number of ensembles that have been determined to be invalid due to filtering based on the water track vertical velocity.
% Invalid Other—Number of ensembles that have been determined to be invalid due to filtering using other filters. Currently (2015) other filters are not implemented.
% Invalid SNR—Number of ensembles that have been determined to be invalid due to filtering of the signal to noise ratio (SNR) range. This filter applies to SonTek data only.
Discharge Prev. —Total discharge prior to most recent filter change.
Discharge Now—Total discharge after applying the most recent filter change. If no filters have been changed, the discharge now will equal the discharge previous.
Discharge % Change—The percent difference between the discharge previous and the discharge now due to the last filter change.
 
2

Transect Displayed

2. Transect Displayed
Filename of the transect displayed in the graphs.
3

Filtered Data

3. Filtered Data
 
The Filtered Data graph is determined from the type of data graphed, which is selected by the user using the radio buttons on the right. For 3 Beam Solutions, Error Velocity, Vertical Velocity, SNR Range (only for SonTek RiverSurveyor ADCPs), and Contour showing invalid, the left portion of the Graphics panel will display two graphs. The default is to display a color contour graph showing only valid data without interpolation. The top graph will display a time series graph for the other types of data selected:
 
3-Beam Solutions
 
Vertical Velocity
 
Error Velocity
 
SNR Range (only for SonTek RiverSurveyor ADCPs)
 
With the exception of 3 Beam Solutions, the time series shows every valid depth cell. Showing every depth cell allows the user to visually evaluate the magnitude and variance of the data. Invalid data are identified by red circles.
 
 If All Time Series or Other are selected from the radio buttons, the left graph is a single time series graph.
 
All Time Series
 
Other
 
Currently, other filters have not been implemented; therefore, the other graph is a times series of the average water speed for each ensemble.
4

Processed Data

4. Processed Data
The Processed Data graph is a color contour graph showing full processed data including interpolation. These are the dat athat will be used to compute discharge.
5

Ship Track

5. Ship Track
The Ship Track graph shows the ship track using the processed navigation reference. Locations of invalid water data and the cause of the data being marked invalid are shown with symbols indicated in the legend.
6

Navigation Reference

6. Navigation Reference
Identifies the selected navigation reference.
7

Excluded Distance

7. Excluded Distance
The Excluded Distance is the distance below the transducer for which measured WT data will not be used. This value defaults to zero except for:
RiverSurveyor M9: default = 16 cm (U.S. Geological Survey, 2014)
TRDI RioPro: default = 25 cm
8

Beam Filter

8. Beam Filter
The Beam Filter panel shows the current setting and allows the user to change the filters as necessary from the following options:
 
Auto—Evaluates 3 beams solutions using neighboring data to determine the validity of the 3 beam solution. Details are documented in Mueller (2016).
Allow—Allows 3 beam solutions
4 Beam—Allows only 4 beam solutions
9

Error Velocity Filter

9. Error Velocity Filter
The Error Velocity Filter panel shows the current setting and allows the user to change the filters as necessary from the following options:
 
Auto—Use the variance of the error velocity data to automatically set threshold limits for each transect. Details are documented in Mueller (2016).
Manual—Allows the user to enter a threshold value that will be applied to all transects in the measurement.
Off—No error velocity filter is applied.
 
NOTE: The error velocity filter does not always perform well on data from ADCPs with auto adaptive modes (S5, M9, RiverRay, RiverPro, RioPro) due to the change in error velocity distribution for the different modes.
10

Vertical Velocity Filter

10. Vertical Velocity Filter
The Vertical Velocity Filter panel shows the current setting and allows the user to change the filters as necessary from the following options:
 
Auto—Use the variance of the vertical velocity data to automatically set threshold limits for each transect. Details are documented in Mueller (2016).
Manual—Allows the user to enter a threshold value that will be applied to all transects in the measurement.
Off—No error velocity filter is applied.
 
NOTE: The vertical velocity filter does not always perform well on data from ADCPs with auto adaptive modes (S5, M9, RiverRay, RiverPro, RioPro) due to the change in error velocity distribution for the different modes.
11

SNR Filter

11. SNR Filter
The SNR Filter panel shows the current setting and allows the user to change the filter as necessary from the following options:
 
Auto—The SNR filter is applied with predetermined thresholds to RSL data only. Details are documented in Mueller (2016).
Off—No SNR filter is applied.
12

Graphics Toolbar

12. Graphics Toolbar
Allows user to zoom, pan, and query the graphs. For more information see Toolbar.
13

Add Comment

13. Add Comment
Allows the user to add a comment. For more information see Comment Button.
14

User's Guide

14. User's Guide
Opens this User's Guide
15

Close Window

15. Close Window
Close window and return control to the main window.