Display page
The Display page of the Variable Properties dialog box is used to control the way data is displayed in echogram, cruise track or some graph windows.
This page displays settings relevant to the type of variable as follows:
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Sections for all acoustic variables
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Sections for single target variables only
Sections for multibeam variables only
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Sections for position variables
Note: A different page is displayed for acoustic and position variables; some variables have special sections on this page.
Sections for all acoustic variables (Echogram)
Echogram colors
The Echogram colors section is used to define the colors used in displaying echograms. It is visible only if Echogram is selected under Display properties for.
For most acoustic variables the following settings are available:
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Settings
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Description
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Color display minimum
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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.
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Color display range
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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.
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Color Scheme
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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.
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For angular position variables the following settings are available:
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Settings
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Description
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Minor-axis angle range
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Enter the range of minor-axis beam angles to display. The values you enter must be between 0.01 and 90 degrees.
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Minor- axis color scheme
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Choose from pre-defined or customized color schemes. See note below.
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Major-axis angle range
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Enter the range of major-axis beam angles to display. The values you enter must be between 0.01 and 90 degrees.
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Major-axis color scheme
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Choose from pre-defined or customized color schemes. See note below.
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Notes:
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The echogram color settings will also affect along-track displays of Mean Sv, Maximum Sv and Minimum Sv.
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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.
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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. It is visible only if Echogram is selected under Display properties for.
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Settings
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Description
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Upper display limit
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Defines the smallest depth/range displayed in the echogram.
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Lower display limit
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Defines the largest depth/range displayed in the echogram.
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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 first time an echogram is displayed from an EV file, the upper and lower display limits are set to display the full depth range of the first echogram telegram (the first ping) in the first data file in the file list. The limits of the echogram data may vary between data files or even within the one data file but the data can still be displayed correctly by Echoview. It may, however, be necessary to manually change the upper or lower display limits if the data range of some data is greater than the data range in the first ping.
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.
Echogram general display options
The general display options for echograms are as follows:
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Settings
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Description
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Integram analysis
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Choose an analysis to display in the integram area of the echogram. You can choose from:
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Integration line
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Choose to display an Integration line for the data in an Integration rectangle on the echogram.
You can choose from:
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Integration line
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Description
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None
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No Integration line displayed
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In window
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Display an Integration line for the data in the visible window.
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In intervals
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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.
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In cells
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Display an Integration line for the data in a cell.
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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
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Click the colored square beside Integration line.
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Select a basic color or create a custom color.
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Click OK.
See Integration line algorithm for more information.
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Sections for all acoustic variables (Cruise track)
Cruise track
The Cruise track section is used for along-track displays. It is visible only on Sv variables and only if Cruise track is selected under Display properties for.
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Settings
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Description
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Along-track analysis
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Choose an analysis for along-track display.
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Along-track width
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Sets the width (in pixels) of the along-track cruise track that will be displayed for the variable.
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Cruise track colors
The Cruise track colors section is used for along-track displays. It is visible only on Sv variables and only if Cruise track is selected under Display properties for.
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Settings
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Description
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Color display minimum
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Sets the value below which all data values will be displayed in the Below threshold color of the selected color scheme.
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Color display range
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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.
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Color scheme
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Choose from pre-defined or customized color schemes.
User-defined color schemes can be created and edited with the Echocolor application supplied with Echoview. Note that 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.
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Note: The three cruise track color settings are only available for some analysis variables (choose an analysis variable in the Cruise track section). Along-track displays of Mean Sv, Minimum Sv, and Maximum Sv are displayed with the Echogram color settings. Along-track displays of ping status display the user-defined colors.
Cruise track general display options
The general display options for cruise tracks are used for along-track displays. They are visible only on Sv variables and only if Cruise track is selected under Display properties for.
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Settings
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Description
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Show grid lines
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Check this box to display grid lines on the along-track display, and leave it unchecked to view the display without grid lines.
Note: This setting will only affect the along-track display, and not any open echogram.
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Show scale bar
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Check this box to display the scale bar on the along-track display window.
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Sections for single target variables
The Sections for all acoustic variables (echogram) are displayed as well as the following section:
Single target display
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Settings
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Description
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Upper detection range
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Enter the single target detection range in meters. This allows you to differentiate between ranges where you tried to detect targets and there weren't any and ranges where you did not try to detect targets.
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Lower detection range
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Thickness factor
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Controls the display thickness of single target detections on an echogram. See Configuring single target display thickness for more information.
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Sections for multibeam variables (echogram)
The sections for all acoustic variables (echogram) are displayed as well as the following section:
Multibeam display
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Setting
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Description
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Show multibeam bottom preview
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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.
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Flip horizontally
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Select this check box to rotate the multibeam sector plot 180 degrees in the horizontal plane.
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Show direction labels
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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.
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Show target outlines
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Select this check box to display outlines around the targets detected in multibeam target detection.
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Show target sample outlines
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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.
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Show input data under targets
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Select this check box to display the input data for the detected multibeam targets.
This setting can be toggled with a user-defined shortcut.
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for H-mode variables only, following option is also available:
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Orientation
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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. See Furuno FSV-30 (Research version).
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Sections for multibeam variables (cruise track)
The sections for all acoustic variables (cruise track) are displayed as well as the following sections:
Transparency
The display options for H-mode cruise tracks are used for along-track displays of H-mode data. They are only visible on Sv variables of ping mode 3 and only if Cruise track is selected under Display properties for.
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Settings
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Description
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Values below the color display minimum
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All samples in displayed pings with values below the color display minimum will be transparent.
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Values above the color display maximum
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All samples in displayed pings with values above the color display maximum will be transparent.
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No data
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All samples in displayed pings with the no data value will be transparent.
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Sampling
The display options for H-mode cruise tracks are used for along-track displays of H-mode data. They are only visible on Sv variables of ping mode 3 and only if Cruise track is selected under Display properties for.
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Settings
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Description
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First ping
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Ping number of first ping displayed.
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Last ping
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Ping number of last ping displayed.
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Sampling factor
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Every Sampling factor pings will be displayed.
That is, the pings which are displayed will be numbers:
0, Sampling Factor, 2xSampling Factor, 3x Sampling Factor ... N x Sampling factor
Such that N is the largest multiple of Sampling factor before the last ping.
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Position variables
General display options
The Cruise trackdisplay options section is included on the Display page for position GPS fixes variables and is used to enter display settings for position variables.
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Settings
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Description
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Show good fixes
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Select this option to display good GPS fixes on the cruise track window. Good fixes are displayed as green crosses.
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Show bad fixes
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Select this option to display bad GPS fixes on the cruise track window. Bad fixes are displayed as red crosses.
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Show grid lines
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Select this option to display grid lines on the cruise track window.
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Show scale bar
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Select this option to display the cruise track window's scale bar.
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See also : About GPS fix status
Map and waypoint files
The Map and waypoint files section is available for position variables and is used to manage the map and waypoint files. Select the files to display then in the cruise track window.
Note: Map and waypoint files are added on the Mapping page of the EV File Properties dialog box.
Warning: Echoview is not a navigational tool. Any map files supplied with Echoview show indicative positions of coastlines only; they do not show navigational hazards.
See also
About Cruise Tracks
About Graphs
About Echograms
Variable Properties dialog box