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:

• On the toolbar, click EV File
  
  - OR -
• On the View menu, click EV File properties,
  
  - OR -
• Press F6

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

• Bottom Classification page
• Classes page
• Echogram page
• EV File page
• Export page
• Fish Tracks page
• Lines and Surfaces page
  • Single beam (Line pick)
  • Multibeam (Surface detection)
• Mapping page
• Ping Status page
• Notes page
  • Survey Metadata
• Region Classification page
• Schools page

You can also inspect, modify and export the settings on this dialog box with the Properties Action.

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.
Features to Extract
Bottom features	Select or clear the bottom features to extract from the first bottom echo and the second bottom echo. Features include: Bottom_roughness_normalized Bottom_hardness_normalized First_bottom_length_normalized Second_bottom_length_normalized Bottom_rise_time_normalized Bottom_line_depth_mean Bottom_max_Sv Bottom_kurtosis Bottom_skewness 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_normalized. When no second bottom echo exists, clear Second_bottom_length_normalized and Bottom_hardness_normalized. See also Cluster Dimension Selection, Manual.
Cluster Dimension Selection
Automatic (Principal component analysis)	This setting 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. This setting requires at least two dimensions and this may affect available choices under Features to Extract.
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: Within cluster sum of squares (WCSS) with elbow Calinski-Harabasz
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: Within cluster sum of squares (WCSS) Calinski-Harabasz
Clustering iterations	Specifies the number of 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 be 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 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.
Transects	Toggle the transect bar on echograms.
Multibeam replay rate	Defines the replay rate for multibeam echograms. Note: You can assign a user-defined keyboard shortcut to increase or decrease 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. See also About lines: Color. 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 (virtual) 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.
Trained model bottom exclusion (experimental)	See Trained model bottom exclusion (experimental) algorithm for details.

Available settings depend on the algorithm chosen:

Basic settings	Description
Start range	Specifies the start range (m) for the line pick algorithm.
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 identification	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
Not set	This Ping status and color cannot be changed and is used to represent pings that have no ping status assigned.
0...9	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 › sign next to the checkbox next to the variable or category's name.

To select an analysis variable for export, or a whole category, select the checkbox next to the variable or category's name. The checkbox 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 of the analysis variables in this category are selected for export.
	all of the analysis variables in this category are selected for export.

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 (analysis).csv filename (cells).csv filename (intervals).csv filename (layers).csv filename (species).csv Created for Sv integrations By Regions By Cells exports that include a specified Density number or Density weight export variable. filename (regions).csv Created for By Regions exports. filename (targets).csv Created for single target and fish track exports. 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 checkbox.
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 area units	Biomass area units selects the units for the Density_number and Density_weight analysis variables. This setting affects 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). See also Detecting schools on single beam data: Before you begin.

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
Distance mode	Use the Distance mode list to select the information used to determine distance for all school detection settings. The Distance mode value can affect the 2D schools detection. List items include: GPS distance Vessel log distance Water current distance Ping number Ping time GPS distance/Vessel log distance/Ping number/Ping time are available for Platform type: Position determined by GPS. Ping time/Ping number are available for Platform type: Fixed. Water current distance where units are in meters is available for Platform type: Fixed, and a specified Water current speed source. See also About speed data.
Minimum total school height (meters)	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. When Distance mode is GPS distance/Vessel log distance/Water current distance length is in meters. When Distance mode is Ping time, length is in seconds. When Distance mode is Ping number, length is in pings. Use the Show time/distance grid to help estimate school candidate length.
Minimum candidate height (meters)	Minimum height allowed for a single school candidate.
Maximum vertical linking distance (meters)	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. When Distance mode is GPS distance/Vessel log distance/Water current distance length is in meters. When Distance mode is Ping time, length is in seconds. When Distance mode is Ping number, length is in pings. 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. Use the Show time/distance grid to help estimate horizontal linking distance.
Minimum total school length	After linking is completed, schools shorter than this length will not be included in detections. When Distance mode is GPS distance/Vessel log distance/Water current distance length is in meters. When Distance mode is Ping time, length is in seconds. When Distance mode is Ping number, length is in pings. Use the Show time/distance grid to help estimate school length.

Notes:

• Other settings are also relevant to school detection, in particular the settings on the Data page of the Variable Properties dialog and the Exclude above line and Exclude below line settings on the Analysis page.
• Assumptions about the data used for school detection and for calculating corrected schools parameters are made in some school detection algorithms, for example, that only a minimum Sv threshold has been applied to the data. Echoview can filter and condition data in ways that may not be compatible with the assumptions of the school detection algorithms. It is not possible for the software to automatically check for situations in which these assumptions are not met. Please review the algorithms.
• School candidates are linked when there is a clear path between them. The presence of valid samples between school candidates can result in candidates not being linked by the algorithm. If you are confident that particular schools should be linked (but aren't by the algorithm), the intervening "valid" samples can be included in a bad data region and you can redo the school detection.
• The detection can be applied when live-viewing data or at the post-processing stage. Following a detection, region classification with rules can be applied.
• About speed data

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 checkbox 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, ECS, and Code operator Python 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.

Note: Relative file paths can cause issues with templates that use ECS file or Code operator Python scripts.

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 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 for data or calibration files on the File Locations page of the Echoview Configuration dialog box.
%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 supported windows, their positions and contents as they were displayed when you closed the EV file. 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 supported 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 given session in 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 checkbox(es) if you want the regions window or the Dataflow window displayed automatically when you open the EV file.

Notes:

• If a workspace becomes invalid, a message is displayed and the workspace resets.
• The Media window is not supported under Workspace settings.
• Under COM, When this EV file is opened settings may not be enforced.

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 and specify region type region outline and fill color.

• Classes
• General
• Echogram display

Classes

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: The Region Class Properties dialog box to create a new region class. The Species Properties dialog box to add a new species. The Target Class Properties dialog box to create a new target class.
Properties	Click a class in the desired section and click Properties to edit properties for: Region Class Properties dialog box Species Properties dialog box Target Class Properties dialog box You can also display the Properties by double-clicking on the region class, species name or target class in the list. Region class Properties allow custom region outline, color. and shading.
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.

General

Settings	Description
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.

Echogram display

Use these settings to customize the outline and fill colors of the different region types. Note, the Predefined color scheme or Custom color scheme can stipulate the default color settings.

Settings	Description
Region type	Specify the region type: Analysis Bad data (empty water) Bad data (no data) Marker
Custom Analysis regions	Toggle the checkboxes for any of these to modify the default behavior. Outline color Click the color swatch to choose the color of region outline from the Color dialog box. Outline thickness Specify the pixel thickness of the region outline. Shading Choose between shading (default) or not shading the region with a fill color. Deactivating shading automatically disables the Fill color setting. Fill color Click the color swatch to choose the fill color of region from the Color dialog box. This is only available if the Shading setting is set to the default behavior.

Mapping page

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

• to select the mapping projection for geographic data processed by Echoview
• to add WMS maps
• to add supported map or waypoint data

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

Settings	Description
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:

• Geographic position data will be displayed on the status bar in units appropriate to the selected projection.
• Changing the projection while viewing a scene or cruise track may cause the scene or cruise track to change.
• If exported geo-referenced images from scenes or cruise tracks are expected to match up with other geo-referenced data from other sources, it is important that they all use the same projection and datum.
• Consider the geographic position of a cruise track when selecting a UTM zone. An unsuitable zone may result in an unexpected map display.
• Only the WGS 84 datum is currently supported by Echoview.

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: For information about viewing these files with cruise tracks refer to Variable Properties dialog box - Cruisetrack Display page. Echoview may incorrectly render WMS maps with unusual projections.
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:

• 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. Echoview Software is not responsible for the content of online maps, and does not guarantee that they are rendered accurately within Echoview.
• You can disable Echoview's WMS map internet connection request with the setting Disable Echoview downloads.

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: For information about viewing these files with cruise tracks refer to Variable Properties dialog box - Cruisetrack Display page. Adding Map and Waypoint files to cruise track windows may also be useful.
Path	The Windows file path for the map or waypoint file.

Notes:

• Geographic position data will be displayed on the status bar in units appropriate to the selected projection.

• Changing the projection while viewing a scene or cruise track may cause the scene or cruise track to change.

• If exported geo-referenced images from scenes or cruise tracks are expected to match up with other geo-referenced data from other sources, it is important that they all use the same projection and datum.

• Only the WGS 84 datum is currently supported by Echoview.

• 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. Echoview Software is not responsible for the content of online maps, and does not guarantee that they are rendered accurately within Echoview.

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