About region type

Region types

Analysis regions
Fish track regions
Bad data regions
Bad data (no data)
Bad data (empty water)
Marker regions

Specifying the region type
See also

Region types

Analysis regions

An analysis region is used to enclose samples which you plan to analyze.

All regions of this type are analyzed for the following exports:

Analysis regions can be given a region class to allow you to classify the data they enclose. This feature may be used for many purposes including the classification of regions according to species.

Fish track regions

A fish track region is used enclose single targets which you plan to analyze as a fish track (that is a the echoes from a single fish).

Fish track regions can be given different region classes to allow you to classify various parts of an echogram or file. This feature may be used to classify different regions for each transducer, for example, or for different species.

All regions of this type are analyzed for Fish Track analyses.

There are rules which constrain the data which fish track regions can enclose. For this reason you must detect or create fish track regions. See About fish track regions for more information.

Bad data regions

A bad data region is used to enclose data (of any type) which you don't wish to use in your analysis. With the release of Echoview 5.4, two types of bad data region are available: Bad data (no data) and Bad data (empty water). In Echoview 5.3 and older, one type was available and it was named Bad data.

Bad data (no data)

A Bad data (no data) region is a useful way to define data points that you wish to exclude from your analysis (e.g. off transect, below target layer etc) or whose values have known or suspected problems (e.g. noise contribution, bad weather, interference, ghost bottoms, echosounder malfunction etc).

Data points within Bad data (no data) regions are treated according to the analysis settings that you define.

Bad data (empty water)

A Bad data (empty water) region is a useful way to define volumes of water that are devoid of your target of interest, e.g. fish of a given species.

Data points within Bad data (empty water) regions are treated according to the analysis settings that you define.

Notes:

For further information about bad data regions and their impacts on integration and biomass estimates refer to About analysis domains: What is excluded from an analysis domain?.
Post Echoview 5.2, no data samples within bad data regions are deemed as bad_data_samples for integration and analysis results. Prior to Echoview 5.2, no data samples within bad data regions were counted as no_data_samples.
See also: About analysis domains: Integration cues.
See also: About samples and echo-integration.

Marker regions

A marker region encloses data for annotation. It is neither a bad data nor analysis region. The annotation can be viewed and edited on the Region browser dialog box.

The Marker region type may be assigned to a selected region using the Region browser or to selected regions using the Region editor. See also Keyboard shortcuts to define marker regions.

Marker regions are automatically created for:

Comment String (CS) telegrams read from Simrad Ex500 data files and Annotation datagrams associated with Vertical markers in Simrad Ex60 data files
Marker telegrams read from SonarData EchoListener data files
Event marker tuples read from HAC data files
Simrad EK80 annotations
BioSonics Comment tuples for Event markers

Note: Uncheck the Create marker regions from data files setting on the Classes page of the EV File Properties dialog box to stop the automatic creation of marker regions. Doing this can improve Echoview's performance when working with these data files.

To make the annotations for marker regions visible, select the Notes for marker regions option under Show in echogram on the Echogram page of the EV File Properties dialog box.

Specifying the region type

Specify the region type with the Region Browser dialog box.

You can change the region type outline and color under Echogram Display on the Classes page of the EV File Properties dialog box.

3D Regions are always analysis regions.