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  • 11. BT Filters

11. BT Filters

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

Summary Table

1. Summary Table
The table at the top of the window allows the user to select which transect to graph (by clicking on the desired row), provides information on the number of ensembles 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. This table does not have any editable cells. The columns in the table are as follows:
 
Filename—Filename of the transect.
# Ensembles—Total number of ensembles in the transect.
# <4 Beam—Number of ensembles that had valid bottom track but less than 4 valid beams.
# Invalid Total—Number of ensembles with invalid bottom track velocity.
# Invalid Orig Data—Number of ensembles that had invalid bottom track velocity prior to any filtering.
# Invalid <4 Beam—Number of ensembles with valid bottom track but less than 4 beams for which the bottom track velocity has been determined to be invalid by the 3 Beam Solutions Filter.
# Invalid Error Vel—Number of ensembles that have been determined to be invalid due to filtering based on the bottom track error velocity.
# Invalid Vert Vel—Number of ensembles that have been determined to be invalid due to filtering based on the bottom track vertical velocity.
# Invalid Other—Number of ensembles that have been determined to be invalid due to filtering using other filters.
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 transect displayed in graphs.
3

Filter Graph

 
The left portion of the Graphics panel is determined from the type of data graphed, which is selected by the user using the radio buttons at the top left of the Graphics panel. Invalid data are identified by red circles.
 
3 Beam Solutions
3. Filter Graph
 
Error Velocity
 
Vertical Velocity
 
Other (only valid if the Other Filter is set to Smooth)
 
All
 Instructions on moving the Legend.
4

BT Speed Time Series

 
4. BT Speed Time Series
The bottom track time series plot is shown except when Other and All are selected above. Instructions on moving the Legend.
5

Ship Track Graph

5. Ship Track Graph
The ship track graph displays the raw (unfiltered and without interpolation) ship track and the processed (filtered and interpolated) ship track. The location and source of invalid data are indicated by symbols shown in the graph legend. The end of the transect is indicated by a black square so the user can determine the direction of boat travel. Instructions on moving the Legend.
6

Navigation Reference

6. Navigation Reference
The Nav Ref panel that shows the current navigation or boat velocity reference. If this reference is not BT, then changes to the BT filters will not change the discharge.
 
7

Beam Filter

7. 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—(Default) 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
 
8

Error Velocity Filter

8. 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—(Default) 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.
9

Vertical Velocity Filter

9. 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—(Default) 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.
10

Other Filter

10. Other Filter
The Other Filter panel shows the current setting and allows the user to change the filters as necessary from the following options:
 
Off—(Default) No spike detection type filter is applied.
Smooth—A locally weighted scatterplot smoothing (LOWESS) filter  with a dynamic moving window is applied. Details are documented in Mueller (2016).
 
11

Graphics Toobar

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

Add Comment

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

User's Guide

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

Close Window

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