EV File Properties dialog box

The EV File Properties dialog box is used to enter settings associated with the current EV file.

To display the EV File Properties dialog box:

The EV File Properties dialog box displays context sensitive pages which may include the following:

Bottom Classification page

The Bottom Classification page is used to configure the Feature Extraction and Clustering algorithms used for a bottom classification. Sv variable-specific settings which are also required for bottom classification settings are found under the Bottom settings section on the Analysis page of the Variable Properties dialog box. For further information refer to About bottom classification and Bottom classification algorithms.

The following sections are available:

Setting

Description

Feature Extraction Interval

Time/distance/ping interval

Specifies the interval type used by the bottom classification algorithms. The Time/distance list offers the following interval types:

  • Time
  • GPS distance (nmi)
  • Vessel log distance (nmi)
  • Ping number
  • GPS distance (m)
  • Vessel log distance (m)

Distance between intervals (nmi/m)

Time between intervals (minutes)

Number of pings between intervals

Specifies the size of the interval. The feature extraction interval aims to use an average of similar echoes to get better stability in the data for a classification. The default interval is 10 pings or its equivalent.

The size of the interval may affect the duration of PCA calculations.

Feature to Extract

Bottom features

Select or clear the bottom features to extract from the first bottom echo and the second bottom echo.

Features include:

Notes:

  • Bottom classification time increases with the number of selected features.
  • Bottom_max_Sv, Bottom_kurtosis, Bottom_skewness are associated with the first bottom echo. These features may reveal useful characteristics of the roughness index that is used to calculate Bottom_roughness_nomalized.
  • When no second bottom echo exists, clear Second_bottom_length_normalized and Bottom_hardness_normalized.

Cluster Dimension Selection

Automatic (Principal component analysis)

This settings sends Z-scores of extracted features to Principal component analysis algorithms. Five cluster dimensions may be identified. Information associated with feature weightings under Automatic PCA is sent to the Messages dialog box. See also Bottom classification algorithms: Automatic PCA message.

Manual

This setting allows you to specify an extracted feature as a cluster dimension. Use the Dimension Properties button to specify dimensions. Z-scores of the specified features are passed to k-Means algorithms.

Bottom Class Allocation

Automatic detection

This setting runs k-Means clustering of bottom points using a specified method from the Method list. Information associated with Automatic detection is sent to the Messages dialog box. See also Bottom classification algorithms: Automatic k-Means message.

The following Methods are available:

Manual

The Manual setting runs k-Means clustering for a specified Class count.

Class count

Specifies the number of classes for manual bottom class allocation.

Cluster measure

Cluster measure is available when Manual is selected. Use the Cluster measure list to specify the method that controls the clustering. Cluster measure makes it easier to compare Automatic and Manual clustering.

Methods:

Clustering iterations

Specifies the number iterations for the k-Means clustering.

Region Classification page

The Region Classification page is used to create, edit and view classification rules for the Classify region feature. Region classification can be applied with a 2D school detection, or to selected 2D regions on single beam echograms. For more information refer to Classifying regions.

The following sections are available:

Section

Description

Rules

The Rules section specifies a Rule's Name and a Rule's Region class.

  • To create a new Rule, click Rules and click Add Rule.
  • To delete a Rule, select the Rule and click Delete Rule .

The Rule's Name can by typed.

The Rule's Region Class can be selected from the list of available classes.

Notes:

  • Region classes are created, edited and deleted on the Classes page of the EV File Properties dialog box.
  • A Rule's Name cannot be left blank.
Special cases

The Special cases section is used when there are multiple Rules. You can specify a Region Class to apply for the listed Special cases:

  • Multiple rules match
  • No rules match

Select an available Region Class from the list. The Do Nothing item leaves the region class unchanged.

Analysis variable, Condition, Value

This section specifies a Rule's conditional tests which are used to assess a region.

  • To create a new conditional test, click Add.
  • To delete a conditional test, select the test and click Delete.

A conditional test is specified by the relationship between the Analysis variable, Condition and Value.

Analysis variable

Displays the name of an Analysis variable that can be calculated for the region. Available variables are associated with an integration analysis or schools (export) analysis.

Condition

Displays the selected Condition for the conditional test.

Available Conditions include:

> Greater than.
< Less than.
>= Greater than or equal to.
<= Less than or equal to.
= Equal to.
Not equal to.

Value

Displays a value for the Analysis variable in the conditional test.

Echogram page

The Echogram page of the EV File Properties dialog box controls the display of echograms in the EV file.

Settings

Description

Echogram mode

Defines whether the vertical dimension on echograms is displayed in depth or range values. See About depth, range and altitude for further details.

Note: Range mode is unavailable for single beam echograms when a Heave source is is applied to the platform. Multibeam data may be viewed under both modes when a Heave source is applied. For more information refer to About heave compensation.

Show on echogram

Position status

If selected, a color bar is displayed at the bottom of the echogram indicating the position status of pings and GPS fix status.

Analysis

If selected, Echoview displays analysis-hatching covering the analyzed area upon completion of an on-screen integration or an on-screen analysis on an echogram.

Region names

If selected, region names are displayed with each region on the echogram.

Region classes

If selected, region classes are displayed with each analysis region on the echogram.

Note: A Region class is not displayed for unclassified regions.

Notes for marker regions

If selected, annotations (Notes) for marker regions are displayed with each marker region on the echogram.

Geographic positions on time/distance grid lines

If selected, the geographic position of the platform at each time/distance grid line is displayed on the echogram. The geographic positions will be displayed as degrees (latitude/longitude) or meters (eastings/northings) depending on the settings on the Mapping page of the EV file Properties dialog box.

Shade bad data regions

If selected, bad data regions are subtly shaded when they are not actively selected on the echogram.

Shade analysis regions

If selected, analysis regions are subtly shaded when they are not actively selected on the echogram.

Shade marker regions

If selected, marker regions are subtly shaded when they are not actively selected on the echogram.

Multibeam replay rate

Defines the replay rate for multibeam echograms.

Note: You can assign a user-defined keyboard shortcut to increment or decrement the replay rate.

 

Setting

Description

As logged in file

The video button replay rate is the rate logged in the data file.

Maximum system capability

The video button replay rate is optimized to your computer system's limits. Replay displays all pings smoothly. Smooth replay is achieved by skipping pings.

Note: When this setting is selected, auto-synchronization with other echograms may not work correctly.

Pings per second

The video button replay rate is the rate specified by the Pings per second value. Echoview achieves the specified rate by dropping pings.

Note:

  • Use this setting to view:
    • DIDSON files that were recorded with CSOT (Cluster Size Over Thresholding) applied.
    • files that replay unsatisfactorily under As logged in file or Maximum system capability.

Line display defaults

The Line display defaults section allows you to specify line thickness and line status colors for the EV file. Line status may be assigned by a line picking algorithm or assigned manually, post line creation.

Line variable-specific settings are available on the Display page of the Line Properties dialog box.

Available settings:

Setting

Description

Thickness

Line thickness in pixels.

Color scheme to use

The Color scheme list allows you to choose a predetermined color scheme or create a "Custom" set of colors.

Line status colors

Displays and enables you to select line status colors.

Click a line status color to display a color palette and choose a new color.

Available line status states include:

  • Good (raw) for raw line variables.
  • Good (editable) for editable lines.
  • Good (vitual) for virtual lines.
  • Bad for all line types.
  • Uncertain for all line types.

See also

About Echograms
Understanding echograms

Depth and Range Mode

About regions

Lines and Surfaces page

Single beam tab

The Single beam tab of the Lines and Surfaces page of the EV File Properties dialog box is used to enter the settings for picking lines in single (or split or dual) beam echograms.

The following line pick algorithms are offered:

Line pick algorithm

Description

Delta Sv

See Delta Sv algorithm for details.

Maximum Sv

See Maximum Sv algorithm for details.

Best bottom candidate

See Best bottom candidate line pick algorithm for details.

Available settings depend on the algorithm chosen:

Basic settings

Description

Start depth

Determines at what depth the Line picking algorithm will start, i.e. data above this depth will not be considered.

This is particularly useful if you have high return areas at the top of your echogram that you wish to avoid being picked as bottom.

Stop depth

Determines at what depth the Line Picking algorithm will stop i.e. data below this depth will not be considered.

Minimum Sv for good pick (dB) See Maximum Sv algorithm or Best bottom candidate settings description for details.

Minimum Sv delta for pick (dB)

See Delta Sv algorithm for details.


Backstep settings

Description

Use Backstep

When checked the Discrimination level and Backstep range settings are available.

Discrimination level (dB)

See Best bottom candidate settings description or Maximum Sv algorithm for details.

Backstep range (m)

See Best bottom candidate settings description or Maximum Sv algorithm for details.


Advanced settings

Description

Peak threshold (dB)

See Best bottom candidate settings description for details.

Maximum dropout (samples)

See Best bottom candidate settings description for details.

Window radius (samples)

See Best bottom candidate settings description for details.

Minimum peak asymmetry

See Best bottom candidate settings description for details.

See also

About lines
Line picking and bottom detection

Line picking algorithms

Multibeam bottom detection algorithm

About the Best bottom candidate line pick

Multibeam tab

The Multibeam tab of the Lines and Surfaces page of the EV File Properties dialog box is used to enter the settings for the detection of a surface on multibeam echograms.

These settings are available:

Surface creation

Description

Maximum triangulation distance (m)

Enter the maximum allowable distance between points in the surface.

Where this distance is exceeded a gap will be displayed in the surface.

See also Triangulated irregular networks.


Candidate indentification

Description

Start Depth (m)

Defines the start depth for samples considered for the detection.

Stop Depth (m)

Defines the stop depth for samples considered for the detection.

Minimum threshold factor (%)

Is used in the calculation of a detection threshold (against which samples are evaluated for inclusion in the detection).

Minimum sample gap between candidates

Specifies the number of samples to skip in the evaluation of candidate samples for the detection.

Maximum candidates per beam

Specifies the maximum number of candidate samples in a beam.


Candidate joining

Description

Number of beams used for seeding

Specifies the number of most vertical beams in the ping.

Number of samples to join by the depth criterion

It is used as a beam limit in the selection of candidate bottom samples.

Maximum difference in range between neighbors (%)

Specifies the maximum difference in range between neighbors (%).

 

Maximum number of samples rejected before stopping

Specifies the maximum number of samples rejected before stopping the search for the next good bottom detection. This occurs during the creation of a line of good bottom detections in a ping. When the search exceeds the value, a gap in the line and a hole or holes in the surface can occur.


Quality control

Description

Maximum range of edge samples (%)

Specifies the maximum range of edge samples (%). Candidate bottom sample values that are greater than Rmax are discarded.

See also: Multibeam bottom detection algorithm, Detecting surfaces.

Ping Status page

The ping status page is used to configure the available ping status values.

Each ping in an EV file has an associated ping status flag that can be defined by the user. For example, the status might be used to visually classify the echogram according to bottom type or to flag areas where interpretation is uncertain.

The color bar at the bottom of each echogram will show the ping status if Show ping status has been selected in the Integram analysis section on the Echogram Display page of the Variable Properties dialog box.

Settings

Description

0 (not set)

This cannot be changed and is used to represent pings that have no ping status assigned.

1...10

Enter a name and choose a color for each ping status you would like to define.

Each ping status defined will be made available on the shortcut menu (right-click) for defining ping status. See Integram area.

Export page

The Export page of the EV File Properties dialog box is used to select the variables and format of export files of many analysis export files.

Analysis variables to export

The Analysis variables to export section is used to select the analysis variables you want included with onscreen analysis or in your exports. Matches to text in the filter area can help you to select export variables (from the export categories).

The analysis variables are grouped into categories and presented in a tree. To expand or collapse a category click the + or - sign next to the category name.

To select an analysis variable for export, or a whole category, select the check box next the variable or category's name. The check box next to a category name indicates the status of the individual analysis variables as follows:

  none of the analysis variables in this category are selected for export
some
all

See About analysis variables for full descriptions and details on when different variables are exported.

Output format

The Output format section is used to select the required export format. The following options are available:

Settings

Description

Database format (multiple files)

Exports data to multiple .csv files:

  • filename (cells).csv
  • filename (layers).csv
  • filename (intervals).csv
  • filename (analysis).csv
  • filename (targets).csv - created for single target and fish track exports
  • filename (regions).csv - created for By Regions exports
  • filename (species).csv - created for Sv integrations By Regions By Cells exports that include a specified Density number or Density weight export variable.

The exported data are formatted for use with a database application.

Spreadsheet format (single file)

Exports data to a single .csv file. The exported data can be opened in any application that supports the .csv file format, e.g. a spreadsheet application.

Note: This format is the only format available for analysis by region and analysis by selection exports.

General

Settings

Description

Output empty cells

See Output Empty Cells for details on this check box.

Output empty single target pings

When the Output empty single target pings setting is checked, empty pings are exported for Single target exports. This allows exported Single target .csv data to be correctly re-imported into Echoview.

Biomass export

The Biomass export setting is used to select the units that will be used for the Density_number and  Density_weight analysis variables. This setting will affect all exports made from the EV file.

See also

About exporting analyses

Schools page

The Schools page of the EV File Properties dialog box is used to enter the settings that control schools (shoal) detection.

Single beam schools

The Single-beam schools section is used to enter school detection settings for two dimensional echograms (as opposed to multibeam echograms).

Echoview school detection identifies data points which can be determined as "school candidates". "School candidates" are data points which meet the minimum requirements for length and height. Candidates which meet the relevant criteria can be linked to one another to form a larger candidate.

Settings

Description

Minimum total school length

After linking is completed, schools shorter than this length will not be included in detections.

Minimum total school height

After linking is completed, schools shorter than this height will not be included in detections.

Minimum candidate length

Minimum length allowed for a single school candidate.

Minimum candidate height

Minimum height allowed for a single school candidate.

Maximum vertical linking distance

Maximum vertical distance allowed between two school candidates being linked to form a school.

Maximum horizontal linking distance

Maximum horizontal distance allowed between two school candidates being linked to form a school.

Note: The two linking distances form the vertical and horizontal semi-axes of an ellipse. The ellipse is, in effect, moved around the boundary of a school candidate. If any part of any other school candidate falls within the ellipse, a link is created between the school candidates.

Distance mode

Choose whether GPS or vessel log information is used to determine distance for all school detection settings.

The length measurement used in the calculation of Schools analysis variables, pertaining to distance or length, is also determined by this setting.

Notes:

Multibeam schools

3D School detection is used for multibeam data only.

Click 3D Schools detection properties to open the 3D Schools Detection Properties dialog box.

See also

About detecting schools
Using the School Detection module

Notes about School Detection

School Detection module algorithms

Fish Tracks page

The Fish Tracks page of the EV File Properties dialog box is used to access fish track detection settings and control 3D single target graph displays.

Fish Track Detection

Click Track Detection Properties to display the Track Detection Properties dialog box.

Note: Other settings that are relevant to fish track detection, in particular Exclude above line and Exclude below line, are located on the Analysis page of the Variable Properties dialog box.

3D single targets graph

Select the Show multiple 3D beams check box to show multiple 3D beams on 3D single targets graphs.

Note: 3D single targets graphs require a lot of memory and are currently limited to approximately 50 evenly spaced beams, including the first and last beams.

See also

Fish track editing
Fish track analysis variables

About beam geometry

Exporting Fish Tracks

EV File page

The EV File page of the EV File Properties dialog box is used for file management and window display actions of the EV file.

EV File settings

Select Save file locations relative to the EV File to save data and ECS file paths relative to the location of the EV file. If a relative path can't be determined an absolute file path is used. Relative file paths are useful when the EV file and data file directory structure are independent of storage device. For existing EV files, the default state for the setting is unchecked, and the data file's absolute file path is used. For new EV files, the setting is selected by default.

Select Interpret Ex60 multiplexed channels when you want to interpret Simrad Ex60 multiplexed channels. You can change the setting only before data files are added to a fileset.

Data file locations, Calibration file locations

Data file locations and Calibration file locations display the folders that Echoview will search for data files and calibration files. This makes it easier to access your data on different computers. To keep things simple it is best to keep your calibration files with your data files and set up the data and calibration file locations on the EV File page to be the same.

For example, if you keep your data on a removable hard disk then Windows will assign it a drive letter when you plug it in. Your data file paths will all be wrong if the drive letter has changed. You can use this dialog to tell Echoview to ignore the paths specified with the data files and first search the folder containing the EV file, or the folder specified in the Echoview configuration on that computer.

The display is managed with the following settings:

Settings

Description

New

Adds a new folder to the list.

The following options are available on the button menu:

  • Browse - Displays the Browse for Folder dialog box
  • EV File Folder - being the folder the EV file is in.
  • Echoview Folder - being the the folder that Echoview.exe is in.

Delete

Deletes the selected folder from the list.

Move up

Moves the selected folder up in the list.

Move down

Moves the selected folder down in the list.

The following special folder names may appear in the list:

Folder

Description

%EV File Folder%

This is the folder the EV file is stored in.

%Configured Folder%

This is the path set in Configuration dialog > File Locations for data or calibration files. The configuration settings are specific to the particular computer you are using.

 

%Data File Folder%

This is the path to the folder from which data files were first added.

Note: For new EV files, the Data files location specified on the File Locations page of the Echoview Configuration dialog box is listed as the default Data files folder.

%Calibration File Folder%

This is the path to the folder from which ECS files were first added.

Note: For new EV files, the Calibration files location specified on the File Locations page of the Echoview Configuration dialog box is listed as the default Calibration files folder.

In addition, by default, Echoview will look in %EV File Folder%.

Workspace

The workspace in Echoview consists of windows, their positions and contents. When an EV file is opened Echoview provides the workspace defined here.

In the When this EV file is opened list you can select one of:

Setting

Description

Restore windows from last close

When you open this EV file in Echoview it will restore all of the windows, their positions and contents as they were displayed when you closed the EV file.

Note: To close the EV file without altering the workspace click Close on the File menu.

This feature is useful if, when you open an EV file, you would like to see the EV file as you left it. The workspace is saved when you close the EV file.

Restore windows from last save

When you open this EV file in Echoview it will restore all of the windows, their positions and contents as they were displayed when you last saved the EV file.

This feature is useful if you would like to define a stable workspace which is not influenced by changes you make during any one session working with Echoview. The workspace is saved when you save the EV file.

Open these windows

When you open the EV file the selected windows will be displayed in their default positions (the workspace is not saved, the choice of windows only is saved).

Click in the list, any of the following types of window:
 

Echogram windows

Select the variables for which you want an echogram displayed automatically when you open the EV file.

Cruise track windows

Select this variable for which you want a cruise track displayed automatically when you open the EV file.

Scene windows

Select the scenes you would like displayed automatically when you open the EV file.

Manager windows

Select the appropriate check box(es) if you want the regions window or the Dataflow window displayed automatically when you open the EV file.

Notes:

Classes page

The Classes page of the EV File Properties dialog box is used to create, edit and delete Region classes, Target classes and Species.

Classes are displayed under section headings for Region Classes, Species and Target Classes.

Settings

Description

New

Click a class in the desired section and click New to display:

Properties

Click a class in the desired section and click Properties to edit properties for:

You can also display the Properties by double-clicking on the region class, species name or target class in the list.

Delete

Click a class in the desired section and click Delete to delete the selected Region class, Species or Target class.

Notes:

  • The default classes "Unclassified regions", "Unassigned species" and "Unclassified targets" cannot be deleted.

  • If any regions are assigned the class you are trying to delete, you will be warned that their class will revert to "Unclassified" if you proceed with the deletion.

Create marker regions from data files

Select this setting to automatically create marker regions when data files are added to an EV file.

Uncheck this setting to improve Echoview's performance whilst loading data files with marker regions. Existing marker regions in the EV file are unaffected.

Mapping page

The Mapping page of the EV File Properties dialog box is used:

 Echoview currently supports Equirectangular and UTM projections, but other mapping projections will be supported in future. See About mapping and projections for further information.

Projection

Settings

Description

Datum

Displays the datum for geographical information.

Note: only the WGS 84 datum is currently supported by Echoview.

Map Projection

Select an appropriate projection from the Map projection list. A map projection maps a spheroid onto a two dimensional space and will therefore have areas of minimum and maximum distortion. From more information refer to Map projections.

Units

Displays the appropriate units for the selected projection.

Note: When UTM projection is selected, geographic position is reported as eastings and northings in meters; otherwise geographic data is in the form of decimal degrees of longitude and latitude.

Notes:

UTM zone

This section is only available when the UTM projection has been selected. A map projection maps a spheroid onto a two dimensional space and will therefore have areas of minimum and maximum distortion. From more information refer to Map projections.

UTM zone

Select the Zone number and hemisphere in which the data was collected.

Standard parallel

This section is only available when the Equirectangular projection has been selected. A map projection maps a spheroid onto a two dimensional space and will therefore have areas of minimum and maximum distortion. From more information refer to Map projections.

Settings

Description

Adaptive

Choose Adaptive (Equirectangular projection) as a standard reference.

Specified latitude (degrees)

Choose Specified latitude and enter a value in degrees to use as a standard reference.

Note: Latitude must be entered in either decimal degrees or degree and minutes format.

WMS (Web Map Server) maps

Settings

Description

Name

The name of the WMS map.

Click Add to enter the details of a WMS map that can be displayed as a background on the cruise track window.

Select a WMS map name in the list and click Remove to delete it from the list.

Notes:

URL

The URL address for the WMS map.

Precache maps The Precache maps button is used to download and save WMS maps. This can be useful to those who intend to work with Echoview in locations where there is little or no access to the Internet. See also Notes (below).
Configure The Configure button opens the WMS Map Properties dialog box. The dialog box allows you to specify:
  • the WMS map name
  • which WMS map to select

The dialog box displays WMS Service information, along with a preview of the map.

Notes:

Map and waypoint files

Settings

Description

Name

The filename of the map or waypoint file.

Click Add to load map and waypoint files that can be displayed with cruise tracks.

Select a file in the list and click Remove to delete it from the list.

Notes:

Path The Windows file path for the map or waypoint file.

Notes:

Response Curves page

The Response Curves page of the EV File Properties dialog box is used to define the color response curves available in an EV file. See About color response curves for further information.

Settings

Description

Response curves

Lists the response curves currently defined. By default there is one response curve provided which you cannot edit. It is called Linear.

To create a new response curve click New.

You can also Rename, Delete and Copy response curves using the shortcut menu commands.

Click on a response curve to select it, and display its graph.

Example color scheme

Select a color scheme to use on the edges of the graph.

Graph

This is the graph which defines the response curve. The default response curve (Linear) is a straight line. You cannot edit this graph for this response curve. To edit a response curve you must first create a new response curve (see Response curves).

To edit a response curve you can:

  • add new nodes - right-click anywhere on the response curve and click Add Node

  • delete existing nodes - right-click on any existing node and click Delete Node

  • move existing nodes - click on any existing node and drag to new position

Note: There are constraints to which the curve must conform. You may not be able to add, delete or move nodes with complete freedom. See About color response curves for further information.

Coordinates

If the mouse pointer is over the graph then the coordinates of the mouse pointer on the graph will appear here. The coordinates are measured for In and Out from 0% to 100%. See About color response curves for further information.

Notes page

The Notes page of the EV File Properties dialog box displays EV file information and any extra information about the EV file that is not otherwise captured in Echoview.

The version of Echoview that was last used to save the EV file and the EV file location are displayed.

Survey Metadata

Survey Metadata is used to specify CSV export header record content. Additional transducer specific CSV header record content can be specified on the Notes page of the Transducer Properties dialog box.

Settings

Description

Name

Describes the acoustic survey under which the echogram data was acquired.

For an ICES CSV export, ideally this is the ICES name code for the acoustic survey. If the ICES name code is not used, Echoview attempts to match the Survey text to an ICES code description.

Country/Region

ICES name code for the country or region for the echogram data.

Platform

The Platform text describes the platform on which the echogram data was recorded. The platform may be a ship name, or other type of platform name (e.g. mooring, AUV etc).

For an ICES CSV export, ideally this is the ICES name code for the platform. If the ICES name code is not used, Echoview attempts to match the Platform text to the ICES code description.

See also: Exporting ICES CSV data

See also

About mapping and projections