Echogram Display page

The Echogram Display page of the Variable Properties dialog box is used to control the way data is displayed in echogram windows.

Note: Different display pages are displayed for acoustic variables displayed in an alongtrack cruise track and position variables displayed as cruise tracks.

The settings in the following sections are available:

Sections for all acoustic variables
- Echogram colors
  - Acoustic variables
  - Angular position variables
- Display limits
- Other
Sections for single target variables only
- Single target Display
Sections for multibeam variables only
- Multibeam display

Sections for all acoustic variables (Echogram)

Echogram colors

The Echogram colors section is used to define the colors used in displaying echograms.

Acoustic variables

Settings	Description
Color display minimum	Sets the value below which all data values will be displayed in the Below threshold color of the selected color scheme. Note: If the minimum threshold specified on the Data page is higher than the Color display minimum specified here, the data threshold specified on the Data page will define the lowest value displayed. The keyboard shortcuts, F11 and F12, will adjust this value when used in an echogram window.
Color display range	Sets the range of data values which are mapped to the selected color scheme. All values above (Color display minimum + Color display range) will be displayed in the color schemes Above (threshold + range) color.
Color Scheme	Choose from pre-defined or customized echogram color schemes. User-defined color schemes can be created and edited with the Echocolor application supplied with Echoview. If you add, remove or change the color-scheme files in this folder you will need to restart Echoview before those changes take effect. Note: If a custom color scheme has the same name as a predefined color scheme, its name will have " (.evc file)" appended to it to denote this. See About color schemes for further information. To select a color response curve click . The default color response is linear.

Angular position variables

Settings	Description
Minor-axis angle range	Enter the range of minor-axis beam angles to display. The values you enter must be between 0.01 and 90 degrees.
Minor- axis color scheme	Choose from pre-defined or customized color schemes. See note below.
Major-axis angle range	Enter the range of major-axis beam angles to display. The values you enter must be between 0.01 and 90 degrees.
Major-axis color scheme	Choose from pre-defined or customized color schemes. See note below.

Notes:

The echogram color settings will also affect along-track displays of Mean Sv, Maximum Sv and Minimum Sv.
Echoview requires the display settings on your computer to be set to at least 16-bit color (65536 colors). Better display results will be obtained with 24 or 32-bit color.
The two color schemes "Minor-axis angle" and "Major-axis angle" have been specifically designed for angular position data. For each sample on the echogram the two colors corresponding to each of the two angles for that sample are combined to form one display color. The resulting display color, when checked against the angular positions color legend, indicates the position within the incident beam for that sample. Myriax recommends using these color schemes for displaying angular position data.
If you are interested only in displaying position on one axis for an angular position variable, then set the color scheme for the other axis color scheme to "None".

Echogram display limits

The Echogram display limits section is used to set the upper and lower display limits for the echogram.

Settings

Description

Automatically set the display limits based on the loaded pings

Select this setting when you want the echogram to display data from the entire sample range. This setting accomodates new (added) data and new EV files based on templates.

Variables in new EV files select this setting by default.

Note: The Display limits can change as you scroll the echogram. This may occur when Echoview draws pings which have a bigger range than previous pings.

Manually set the display limits

Select this setting when you want to specify the sample display range.

Upper display limit	Defines the smallest depth/range displayed in the echogram.
Lower display limit	Defines the largest depth/range displayed in the echogram.

Upper and lower display limits are entered in meters and will apply to either depth or range depending on the mode selected on the Echogram page of the EV File Properties dialog box.

The upper and lower display limits cannot be overridden by zooming out. To see parts of the echogram outside the currently displayed limits the above settings must be changed.

Other

The Other display options for echograms may include:

Settings

Description

Integram analysis

Choose an integram analysis to display in the integram area of the echogram. You can choose from:

Ping status
Mean Sv (on Sv echograms only)
Maximum Sv (on Sv echograms only)

For more information refer to About the integram and Using the integram.

Integram feature Sv threshold (dB)

Displays the Integram Sv threshold value and the condition applied to the value. These settings are used to locate particular pings with the Next integram value / Previous integram value feature from the Shortcut menu.

Available settings:

Setting

Description

Condition

greater than

Find the next pings that are greater than the Integram Sv threshold value.

less than

Find the next pings that are less than the Integram Sv threshold value.

Integram Sv threshold value (dB)

Value for the Integram Sv threshold value.

Notes:

The Next integram value / Previous integram value feature shifts the echogram to and displays a marker around the value or values that satisfy the Integram Sv threshold condition and value.
The Mean Sv analysis and Maximum Sv analysis are affected by the Exclude Above and Exclude Below settings on the Analysis page of the Variable Properties dialog box.
For more information refer to About the integram and Using the integram.
Integram keyboard shortcuts.

Integration line

Choose to display an Integration line for the data in an Integration rectangle on the echogram.

You can choose from:

Integration line

Description

None

No Integration line displayed

In window

Display an Integration line for the data in the visible window.

In intervals

Display an Integration line for the data in an interval. The integration rectangle is defined by the height of the visible window and the width of the interval.

In cells

Display an Integration line for the data in a cell.

Note: While the echogram or the Variable Properties dialog box is active, you can change the Integration rectangle (successively) using CTRL+SHIFT+I

To choose the color of the Integration line

Click the colored square beside Integration line.
Select a basic color or create a custom color.
Click OK.

See Integration line algorithm for more information.

Flip echogram vertically

Choose to flip the echogram so that depth/range = 0 m is at the bottom of the window. Values increase as you move up the window.

Sections for single target variables

Single target display

Refer to the Single target settings section on the Data page of the Variable Properties dialog box.

Sections for multibeam variables (echogram)

Multibeam display

Settings may include:

Setting	Description
Show multibeam bottom preview	Select this check box to display a preview of the bottom detection on multibeam echograms. A circular mark is drawn on the each sample which is detected as the bottom, in the center of the side nearest the transducer.
Flip vertically	Select this check box to display range/depth = 0 m at the bottom of the multibeam echogram window.
Flip horizontally	Select this check box to rotate the multibeam echogramt 180 degrees in the horizontal plane. Beams and beam numbering read from highest (left) to lowest (right).
Show direction labels	Select this check box to show the direction of the beam numbering for the sector plot. This setting is a useful orientation cue when you use Flip horizontally.
Show target outlines	Select this check box to display outlines around the targets detected in multibeam target detection.
Show target sample outlines	Select this check box to display outlines around the samples included in detected multibeam targets. This setting can be toggled with a user-defined shortcut.
Show input data under targets	Select this check box to display the input data for the detected multibeam targets. This setting can be toggled with a user-defined shortcut.
Show target class labels	Clear this check box to hide target class labels for detected multibeam targets.
for H-mode variables only, following option is also available:
Orientation	Select either North up or Head up. If North up is selected then the echogram will be oriented such that geographic north is in the upwards on the screen. If Head up is selected then the echogram will be oriented such that heading of the vessel is in the upwards direction on the screen. The beam numbering in either case is instrument specific.