About regions

Regions in Echoview are a feature of the EV file. Once defined, a region can be applied to all echograms in an EV file, including virtual echograms. Each region has five basic properties:

• ID, a unique number assigned by Echoview then the region is created. It is visible on the Regions window and in Region exports. You cannot alter the ID of a region once it is created
• name, used to identify the region. You may choose any name you like.
• type, used to describe the intended use for a region. See About region type for details.
• dimension,  distinguishes between significantly different types of object - flat two dimensional (2D) regions or full bodied three dimensional (3D) regions. See About region dimension for details.
• class, used to group regions for any purpose useful to you. See About region class for details.

Note: The Notes page of a region can be used to record additional information about a region. If the region has been created by a 2D or 3D Schools detection, the Schools detection settings are recorded on the Detection Settings page.

Regions can be displayed in a number of ways:

• On single, split or dual beam echograms, 2D regions are displayed with a colored border indicating its type. Regions appear cross-hatched when selected.
• On multibeam echograms, 3D regions (the intersection of the region with the visible ping) are displayed with a colored border and cross hatching. The cross-hatching is denser when the region is selected.
• On scenes, 3D regions are displayed as 3D objects.

On echograms, the default colors for each type of region are :

• Black border and yellow hatching for an analysis region.
• Purple border and hatching for a bad data region.
• Orange border and hatching for a marker region.
• A series of eight colors and hatching is used for fish track regions.
  
  These are the defaults colors only, you can define other colors in customized color schemes using Echocolor.

Regions can also be viewed on:

• The Regions window
• The Region browser dialog box
• The (3D Object) Properties dialog box

Working with regions

Active region

An Active region is the region available for analysis, export and synchronizing. You can only have one Active region at a time. To make a region Active:

1. On an echogram, use the rectangle tool and click on a region.

- OR -

2. On the Regions window, double click a region

- OR -

3. In the Region Browser dialog box, scroll through the regions using the next and previous arrows.

When a region is the Active region, you can:

• Export the Sv value.
• Graph the frequency distribution.
• Integrate the region.
• Delete the region.
• View a synchronized display of the region.

The Active region on an echogram has a border 1 pixel wider than other regions, and a fill color (dependent on the type of region).

The Active region is displayed in bold text on the Regions window.

Selected regions

You can have one or more Selected regions. To select regions, open the Regions window and:

1. Click on a single region.

- OR -

2. Hold down the SHIFT key and select multiple regions.

- OR -

3. On the Shortcut menu, select Select All.

When you have one or more regions Selected, you can use the Region Manager dialog box to:

• Change region type.
• Change region class.
• Shift region in time.
• Shift region in depth.
• Classify regions using the Rules that apply conditional tests and assign specified region classes. For more information refer to Classifying regions.
• Delete regions.

See also

About 3D regions
Defining and creating regions
Classifying regions
Region graphs
Exporting region
Joining regions
Editing 2D regions