This page describes the format of files created when you export a line. 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.
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:
A single line containing the string "EVBD", followed by the EVL file format version number, and the version number of Echoview that created the file. Each of these three fields is separated by a single space. For example: "EVBD 3 3.10.1121"
A single line that contains the number of data points in the line, e.g.:"35"
A line for each 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 |
|
0 = none |
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 |
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.
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