Exporting multibeam target data

You can export multibeam targets for all pings or a selection of pings to a comma separated values (.csv) file. The targets.mb prefix is added to the csv file extension (e.g. filename.targets.mb.csv) to identify multibeam targets exports from other data exports.

To export multibeam targets:

  1. Display a multibeam targets echogram.

  2. On the Echogram menu, point to Export, and then click Multibeam targets.

  3. On the Export Data - Select Range of Pings for Export dialog box, select the pings for which you want to export values.

  4. Click Export.

  5. Choose a folder and enter a file name for the export file.

  6. Click Save.

Multibeam target export file format (*.targets.mb.csv)

The first line of the file is a header row that contains the names of the variables that are exported (see below). Each additional row contains the corresponding variables for a single ping.

Variable

Description

Ping_index

Sequential ping number

Note: In Echoview, pings are renumbered sequentially beginning with 0

Distance_gps

Distance (nmi) from the first GPS fix in the data file

Distance_vl

Vessel log (nmi) at the time the ping was transmitted

Ping_date

The date (yyyy-mm-dd) on which the ping was transmitted

Ping_time

The date (yyyy-mm-dd) on which the ping was transmitted

Ping_milliseconds

The date (yyyy-mm-dd) on which the ping was transmitted

Latitude

The latitude (degrees) of the GPS antenna at the time the ping was transmitted

Longitude

The longitude (degrees) of the GPS antenna at the time the ping was transmitted

Heading

The heading of the platform at the time the ping was transmitted

Note: Heading values are taken from the heading source selected on the Attitude page of the Platform Properties dialog box.

Range_start

Range (m) of the closest sample (measured along the beam-axis) in the operand variable.

Range_stop

Range (m) of the farthest sample (measured along the beam-axis) in the operand variable.

Sector_angle

Angle (degrees) scribed between the two outer beams in the operand variable.

Number_of_beams

Number of beams in each ping in the operand variable.

Number_of_targets

Number of targets in the ping.

Ping_mode

Ping mode of the multibeam target variable.

Variable_name

Name of multibeam target variable.

Datafile_ping_number

The number, if any, assigned to the ping in the original data file from which Echoview read the data.

Target values

Note: No title in the header row of the file

Five values are exported for each target:

  • target range (m)

  • target mean Sv (dB re 1m-1)

  • target major-axis angle (degrees)

  • target minor-axis angle (degrees)

  • target status:

  • 1 = excluded from the echogram by the thresholds on the Data page of the Variable Properties dialog box

  • 0 = included on the echogram

The values are exported as follows:

<target 0 range>, <target 0 mean Sv >, <target 0 major-axis angle>, <target 0 minor-axis angle>, <target 0 status>,
<target 1 range>, <target 1 mean Sv >, <target 1 major-axis angle>, <target 1 minor-axis angle>, <target 1 status>,
 ...
<target n range>, <target n mean Sv >, <target n major-axis angle>, <target n minor-axis angle>, <target n status>

For Number_of_targets=n+1.

See also

Target Properties from multibeam data