About data types

Data type

Description

Angular position

Sample values are two angles (degrees) describing the detected position of the sample in the beam (determined from split beam phase measurements).

Boolean

Samples are either true or false.

Color

Sample values are 24-bit RGB quantities, with separate red, green and blue intensities in the range 0 to 255.

Current velocity magnitude

The magnitude of one of the current velocity vectors returned by an ADCP.

Linear

Real numbers with unspecified units.

Power dB

Sample power values (dB).

Single targets

Detected single targets with a range, angular position (for split beam targets) and target strength as a TS value.

Sv

Volume backscattering strength (dB re 1m-1).

Target length

Same as the Single targets data type but reporting target length (cm) in place of target strength (TS).

TS

Point backscattering strength data (dB re 1m2).

Unspecified dB

Sample values are dB values that are not Sv or TS. (E.g., the result from subtracting one Sv value from another.)

Data type

Description

Multibeam boolean

Sample values are either false or true.

Multibeam color

Sample values are 24-bit RGB quantities, with separate red, green and blue intensities in the range 0 to 255.

Multibeam magnitude

Uncalibrated echo magnitude in linear units.

Multibeam phase

Received signal phase (quadrature) in radians (−π to π).

Multibeam Sv

Volume backscattering strength (dB re 1m-1) for multibeam data.

Multibeam TS

Point backscattering strength data (dB re 1m2) for multibeam data.

Multibeam targets

Detected targets with a range, angular position, and Sv value.

Multibeam unspecified dB

Multibeam sample values are dB values that are unreferenced, i.e., neither Sv nor TS.

Multibeam angular position

Multibeam angular position values derived from available split beam phase measurements. Beam geometry matches that of the associated multibeam Sv variable.

Data type

Description

Complex angular position

Sample angular position values (degrees) derived from wideband data where the transmit pulse is frequency modulated.

Complex power dB

Sample complex power values (dB) that represent values of the wideband power where the transmit pulse is frequency modulated.

Complex Sv

Sample complex Sv values (dB) calculated using wideband power.

Complex TS

Sample complex TS values (dB) calculated using wideband power.

Pulse compressed complex angular position

Sample values are two angles describing the detected position of the sample in the beam (determined from split beam phase measurements). The sample values are then pulse compressed.

Pulse compressed complex power dB

Wideband power values (dB) where the transmit pulse is frequency modulated. The sample data are then pulse compressed.

Pulse compressed complex Sv

Sample Sv values (dB) calculated using wideband power. The sample data are then pulse compressed.

Pulse compressed complex TS

Sample TS values (dB) calculated using wideband power. The sample data are then pulse compressed.

Matrix angular position

Matrix angular position values derived from available split beam phase measurements. Beam geometry matches that of the associated matrix Sv variable.

Matrix unspecified dB

Matrix sample values are dB values that are unreferenced, i.e., neither Sv nor TS.

Data type

Description

Raw line

Raw lines are a series of time/measurement coordinates read from an echosounder data file. For more information refer to About lines: Raw line.

A depth variable is a time series of depth values in meters.

A heave variable is a time series of heave values in meters depth.

A length variable is a time series of raw length values in meters.

A sounder-detected bottom line is time series of range values in meters.

Virtual line/Time series

A virtual line is a line variable defined in relation to another line. Virtual lines change in response to changes made to the lines relative to which they are defined. For more information refer to About lines: Virtual line.

Editable line

Editable lines can be created, edited and deleted. For more information refer to About lines: Editable line.

See About lines for more information.

Virtual length

Output data type a virtual variable using a these operators:

• Smoothing filter
• Copy - Time series
• Time series set status

Data type

Description

Virtual analysis time series

A time series output by the virtual variables using these operators:

• Copy - Time series
• Interval analysis - Bottom feature
• Interval analysis - Single targets
• Interval analysis - Sv
• Smoothing filter
• Time series set status

Data type

Description

Virtual calibration time series

A time series output by the virtual variable using these operators:

• Copy - Time series
• Interval analysis - Calibration
• Smoothing filter
• Time series set status

Data type

Description

Virtual transmission time series

A time series output by the virtual variable using these operators:

• Copy - Time series
• Smoothing filter
• Time series set status
• Transmission time series select. The output data is a statistic for the aggregate of all pings in the specified transducer component.

Data type

Description

Virtual unspecified time series

Data type output the virtual variables of these operators when the data is or has been assigned the Unspecified type:

• Copy - Time series
• Smoothing filter
• Time series select
• Time series set status

Data type

Description

Time series collection

A set of time series read from a *.table.csv file. For more information refer to About time series collections.

The output of a virtual variable using the Collate time series operator.

Transmission time series collection

A raw variable that contains active per-ping transducer transmission characteristics recorded in a data file added to a fileset. For more information refer to About time series collections.

Data type

Description

Bottom points

A bottom points variable contains a time series of geopoints output by a bottom classification. Bottom points consist of latitude, longitude, altitude, class name, class ID and extracted bottom features that are created by Echogram menu > Classify Bottom. A bottom points variable may be edited.

See About bottom classification for more information.

Data type

Description