Exporting complex data

Complex data from variables derived from wideband data can be exported from Echoview to a *.complex.csv file.

You can export complex data directly from an echogram or by using a Measurements – complex data exporter object in the Dataflow window. Exporter objects provide a flexible way to manage export settings and reuse export configurations. For more information, see About exporter objects.

To export complex data:

Display Complex data or a pulse compressed Complex data variable echogram.
On the Echogram menu click Export, Complex Data...
-OR-
On the Dataflow window select a complex or pulse compressed complex data variable.
Right-click and select Export, Complex Data Values...
On the export dialog box, specify the Export options.
Click Export...
-OR-
On the Dataflow Toolbox, drag a Measurements – complex data exporter onto the Dataflow window.
In the Exporter Properties dialog box, set the Operand to the Complex or Pulse compressed Complex data variable.
Double-click the exporter object in the Dataflow window to export the data.

Notes:

Exclusions set on the Analysis page of the Variable Properties dialog box are applied to exported data. Excluded samples are handled as no data values.
Region and selection Complex data may be exported. With the mouse pointer over an active region or selection, use the right-click menu and select:
- Export Region, Complex Data
- Export Selection, Complex Data

Complex data export file (*.complex.csv)

The first line of the .complex.csv file lists the variables that are exported (these will be used as column headings if the file is loaded into a spreadsheet program). Each subsequent pair of lines contains the Real and Imaginary values of each variable for a single ping. The number of samples in a ping can be very large.

The following data are exported:

Variable	Description
Ping_index	Sequential ping number. Note: Echoview numbers pings sequentially beginning with 0 for the first ping in an echogram.
Component	Component of sample complex number. Complex number = Real Component + i*Imaginary Component.
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 (dd/MM/yyy) on which the ping was transmitted.
Ping_time	The time (HH:mm:ss) at which the ping was transmitted.
Ping_milliseconds	The millisecond (0..999) at which the ping was transmitted (optional column, may be left out).
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.
Depth_start	Ping start depth (m).
Depth_stop	Ping stop depth (m).
Range_start	Ping start range (m).
Range_stop	Ping stop range (m).
Sample_count	Number of samples in the ping.
List of data values	A data value for each sample (separated by commas). The Component value in the row indicates the Real or Imaginary nature of the sample value.

Exporting complex data

Complex data export file (*.complex.csv)

See also