Exporting line data

Available line export file formats include:

File format

Description

.evl

Exports line data using Echoview's line definition format. This file format is labeled as Echoview format (for re-import) on the Export line dialog box. Data exported in this format can be modified in external applications and re-imported into Echoview.

An *.evl file can be imported into Echoview as an editable line variable.

See the Line definition file format (*.evl) for more information.
 

.csv

depth.csv

Exports simple line depth data to a depth.csv file. The depth.csv option can be easily edited and viewed in Excel. If edited in Excel, the edited data will be read in when the EV file is reopened.

A *.depth.csv file can be added to and removed from a fileset and Echoview can derive a raw line variable.

The .depth.csv file format can be used to specify a line with respect to line segments using time, depth and line status.

See Line file format (*.depth.csv) for more information.

line.csv

Exports detailed line data to a line.csv file. This file format is labeled as CSV format (bathymetric data) on the Export line dialog box.

A *.line.csv file can be added to a fileset and Echoview can derive a raw line variable.

The .line.csv file format can be used to specify:

  • sounder-detected lines
  • lines with respect to latitude, longitude, ping time and platform altitude

See Line file format (*.line.csv) for more information.
 

.evd

Exports line data to a *.evd file. The EVD file format preserves line calibration settings for sounder-detected lines and is suitable for the export of range-based lines.

An exported file may be added to a fileset and Echoview can derive a raw line variable.

See Line file format (*.evd) for more information.


Exporting lines

Export a line displayed in a Graph or Table window, or Dataflow window

Available output file formats: *.depth.csv or *.evl.

  1. Display a line graph or a line table
  2. On the Graph menu or Table menu select Export Line Data ...
  3. - OR -
  4. Select a line object on the Dataflow window.
  5. Right-click and on the Shortcut menu, select Export, Data Values ...
  6. - THEN -
  7. On the Line Export dialog box, specify the range of line measurements to export under Select range to export.
    1. All measurements exports the entire line.
    2. Measurement range (in line points), together with From and To values, exports part of the line. The number of points in the line is displayed by default.
  8. Click Export.
  9. Under File name, browse to a path and enter a file name.
  10. Under Save as type, select the output file format (*.depth.csv or *.evl).
  11. Click Save.

Export a line while an echogram is displayed

Available output file formats: *.line.csv or *.evl.

  1. Display an echogram.
  2. On the Echogram menu, select Export, Line...
  3. Specify settings on the Export line dialog box.
  4. Click Export.
  5. Browse to a folder and enter a name for the export file.
  6. Click Save.

Export part of a line

  1. On the echogram make selection using the Vertical band tool vertical selection tool.
  2. Place the mouse pointer on the selection and right-click.
  3. On the Shortcut menu, select Export Selection, Line ...
  4. Specify settings on the Export line dialog box.
  5. Click Export.
  6. Browse to a folder and enter a name for the export file.
  7. Click Save.

Note: This feature exports line data even when echosounder data files are not completely read, or they are removed.

Export line data to the Echoview Data File Format

Available output file format: *.evd.

See Exporting to Echoview Data File Format.

Line export file format (*.evd)

Line data content in Echoview Data File Format.

Line export file format (*.depth.csv)

Exported line data includes:

Variable

Description

Depth_index

A sequential identification of the export line data points.

Note: Prior to Echoview 12, Depth_index was exported as Depth_data.

Depth_date

Date for the line segment in YYYY-MM-DD format.

Depth_time

Time for the line segment in HH:mm:SS format.

Depth_milliseconds

Time-milliseconds for the line segment in sss format.

Depth_metres

-OR-

Depth_meters

Depth for the line segment in meters.

Depth_status

Line status for the line segment.

0 = none

1 = unverified

2 = bad

3 = good

Line export file format (*.line.csv)

Bathymetric data can be exported to *.line.csv files. The export can be for an entire line or the part of a line that falls within a selection made using the vertical band tool vertical selection tool.

The first line of the .line.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 line contains the value for each variable for a single ping.

The following data are exported.

Variable

Description

Ping_date

YYYY-MM-DD

Ping_time

HH:mm:SS

Ping_milliseconds

ms

Latitude

degrees (999.0 if unknown)

Longitude

degrees (999.0 if unknown)

Position_status

Position status of ping as follows:

 1 =  Interpolated position good

 3 =  Interpolated position uncertain

 4 =  Interpolated position unknown

Depth

meters

Line_status

Line status of ping as follows:

 0 = Bad

 1 = Good

 2 = Unverified

 3 = No line

Sound_speed

m/sec
(only exported for sounder-detected bottoms)

Ping_status

Ping status (1-10)

Altitude

Altitude of the platform at the line segment time.

When GPS is unknown the Altitude value is -9.9e+37.

GPS_UTC_time

hh:mm:ss (-1 if unknown)

Example line

2008-07-13, 04:11:27, 994.0,59.27444235, -176.97746414, 1,132.067922, 1,0,5.000000, 04:11:27

Line definition file format (*.evl)

This is an Echoview line file format. These files have an *.evl extension and may be referred to as "EVL files".

You can view the exported files in an external application (this information on this page should allow you to write software to do this). You can also create or modify EVL files for import into Echoview. If you create or modify EVL files you should do so carefully as Echoview may crash or exhibit other problems on encountering a file that it considers corrupt.

Overall structure

EVL files are structured text data files. A CR/LF pair terminates each line (this is the DOS convention, not the UNIX convention that uses a single LF to terminate each line).

An EVL file consists of the following parts:

Structure of a line describing a single data point

The following fields are written for each data point. The fields are separated by spaces (any number of spaces).

Field

Description

date

CCYYMMDD

time

HHmmSSssss

depth

meters

line status

0 = none
1 = unverified
2 = bad
3 = good

Where:

CC

=

century

e.g.

20

YY

=

year

e.g.

03

MM

=

month

e.g.

01

DD

=

day

e.g.

07

HH

=

hour

e.g.

14

mm

=

minute

e.g.

23

SS

=

second

e.g.

13

hh

=

hundredths of a second

e.g.

87

ssss

=

0.1 milliseconds

e.g.

2854

Special values in .evl files

Sounder-detected bottom lines and lines based on sounder-detected bottom lines can include date and time records without an associated depth. EVL file exports include the special (depth) value -10000.99000 to signify that depth information was unavailable.

Example file

EVBD 3 3.00.41
8
20000410 1530453205  205.321984 3
20000410 1530552245  203.043990 0
20000410 1531139215  198.743539 3
20000410 1532419230  178.502529 1
20000410 1534396220  215.121401 3
20000410 1534407190  215.121401 2
20000410 1536538200  187.270428 3
20000410 1536549220  187.484544 0

See also

About lines