About analysis variables
The result of any exported analysis is one or more files containing comma separated values (.csv format) and a header line which identifies what each column contains. The header line contains the names of the analysis export variables which are in the file.
Some analysis variables are exported automatically, others must be selected on the Export page of the EV File Properties dialog box in order to be exported.
The order of the columns (variables) in an exported file is held constant across Echoview releases to ensure that any software you have or create in order to process such exported data can use the column number reliably to interpret the data, for a given type and configuration of export.
The analysis variables are grouped into the following categories:
-
General analysis variables
- Analysis common
- Analysis domain
- Analysis export
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Integration analysis variables
- Integration results
- Integration schools
- Integration settings
- Biomass
-
Single targets and fish track analysis variables
- Single targets
- Fish tracks
- Frequency distribution
- Wideband frequency response
- Bottom points variables
-
Multibeam analysis variables
- 3D_region metrics
- 3D region integration analysis variables
- Surface metrics
- Automatically exported variables
General analysis variables
Variables listed with + must be selected on the Export page of the EV File Properties dialog box in order to be exported.
Some variables are not listed on the Export page of the EV File Properties dialog box, they are exported automatically with the appropriate type of analysis export.
In the following list of analysis variables the order is alphabetic (not the order in which the columns appear in the exported file). Groups of very closely related variables are summarized, not listed individually, in order to improve legibility (e.g. Date_E, M & S, is short for Date_E and Date_M and Date_S).
*Prior to Echoview 5.2 Good_samples was known as Samples.
Integration analysis variables
Variables listed with + must be selected on the Export page of the EV File Properties dialog box in order to be exported.
Some variables are not listed on the Export page of the EV File Properties dialog box, they are exported automatically with the appropriate type of analysis export.
Variables listed with ++ will only be exported if you have the School Detection module licensed. School/Region altitude analysis variables can be found under the Analysis domain group (above).
In the following list of analysis variables the order is alphabetic (not the order in which the columns appear in the exported file).
Notes
#A selectable bottom point analysis value output to an integration analysis .csv file. This and other bottom point values may also be selected to be displayed with onscreen integration results. A complete bottom point variable export is available through using Export data with a cruise track, table or dataflow bottom points variable.
A fixed platform affects integration schools variables and other associated analysis variables.
Bottom points variables
Variables listed with +++ cannot be selected on the Export page of the EV File Properties dialog box, they are exported automatically with the appropriate type of analysis export.
See Export file formats for more information on the groupings of variables that are exported for Database or Spreadsheet output.
*The bottom feature is included in an integration export only when the feature is chosen for feature extraction for the bottom points variable.
Single target and fish track analysis variables
Variables listed with + must be selected on the Export page of the EV File Properties dialog box in order to be exported.
Some variables are not listed on the Export page of the EV File Properties dialog box, they are exported automatically with the appropriate type of analysis export.
Variables listed with ++ can only be exported if you have the Fish Tracking module licensed.
In the following list of analysis variables the order is alphabetic (not the order in which the columns appear in the exported file). Groups of very closely related variables are summarized, not listed individually, in order to improve legibility (e.g. Angle_minor_axis & major is short for Angle_minor_axis and Angle_major_axis). See Export file formats for more information on the groupings of variables that are exported for Database or Spreadsheet output.
| Single targets | Fish tracks | Frequency distribution |
| Num_targets | Direction_horizontal++ | Bin_count |
| Target_depth_min, mean & max1 | Direction_vertical++ | Bin_TS_mean |
| Target_range_min, mean & max | Distance_2D_unsmoothed++ | |
| Target_length_mean+ | Distance_3D_unsmoothed++ | |
| TS_max | Fish_track_change_in_depth++1 & range++ | |
| TS_mean | Speed_2D_max_unsmoothed++ & mean++ | |
| TS_min | Speed_4D_max_unsmoothed++ & mean++ | |
| Time_in_beam++ | ||
| Tortuosity_2D++ | ||
| Tortuosity_3D++ |
1Echoview 6 renamed Target_depth to Target_on_axis_depth. With this change, the calculations for Target_depth_mean, Target_depth_max, Target_depth_min and Fish_track_change_in_depth changed to assess Target_true_depth values.
Automatically exported variables
Under new EV files, these analysis variables are automatically exported or selected by default.
| Variable name | Export type or comments |
|
Process_ID Layer Interval |
Calculation identifier and cell data. |
|
Region_class Region_ID Region_name Region_bottom_altitude_min Region_bottom_altitude_max Region_bottom_altitude_mean Region_top_altitude_min Region_top_altitude_max Region_top_altitude_mean |
By Regions export for all variants under spreadsheet or database mode except for Wideband Frequency Response.
|
| Depth mean |
When Uncorrected length or Corrected length are selected on the Export page of the EV File Properties dialog box. |
|
C_bad_data no data_samples C_bad_data_empty_water_samples C_no_data_samples C_good samples* |
Export integration analyses by cells or by regions by cells if Output empty cells is selected on the Export page of the EV File Properties dialog box. *Prior to Echoview 5.2 C_good_samples was known as C_samples. |
|
Species_ID Species_name Species_percent Species_name |
Export integration by regions. When Density weight or Density number are selected on the Export page of the EV File Properties dialog box. |
|
Attribute Targets_binned Targets_excluded Targets_failed_filter Targets_failed_thresholds Targets_missed_bins Distance_minor_axis2 Distance_major_axis2 Grid_reference_line3 Target_on_axis_depth2 Region_detection_settings1 Region_notes1 |
Export Frequency distribution. Variations of By Regions, Frequency Distribution spreadsheet or database files also include selected region analysis variables.
1 Included with Analysis By Regions, Frequency Distribution, Database, regions file. 1 Included with Analysis By Regions By Cells, Frequency Distribution, Database, cells file.
2 Included with Analysis By Regions, Frequency Distribution, Database, targets file.
3 Included with Analysis By Cells or Analysis By Regions By Cells, Frequency Distribution, Spreadsheet file. |
|
Angle_minor_axis# & major# Distance_minor_axis3 & major3 Exclude below line depth* Fish_track_change_in_depth5 Height mean2 Ping_date, time & millisecond Ping_number Pulse_duration4 Pulse_start_normalized_PLDL4, 6dB4, 12dB4 & 18dB4 PulseLength_normalized_PLDL4, 6dB4, 12dB4 & 18dB4 PulseLengthDeterminationLevel4 Samples_above_PLDL4 StandDev_angles_minor_axis4 & major4 Target_on_axis_depth1, 2a, 2b, 3, 4 Target_range Target_true_depth TS_comp & uncomp Target_latitude Target_longitude Target_northing Target_easting Target_length Target_length_uncompensated Target_length_manual Target_perimeter Target perimeter edge midpoints Target_area Target area edge midpoints Target_intensity_variation Target_compactness Target compactness edge midpoints Target_thickness Target_length across beams Target_range extent Target class Target orientation Thickness mean2 |
Export By Regions variations for Single targets and Fish tracks also include selected region analysis variables.
# This analysis variable is available only when Database format is selected on the Export page of the EV File Properties dialog box.
* This analysis variable is not available in analysis exports, but in data exports only.
1 Echoview 6 renamed Target_depth to Target_on_axis_depth. With this change, the calculations for Target_depth_mean, Target_depth_max, Target_depth_min and Fish_track_change_in_depth changed to assess Target_true_depth values.
2 Included in Analysis By Regions By Cells, Integration file or Export Fish tracks file. 2a Included in Analysis By Cells, Fish tracks, Database, targets file. 2b Included in Analysis By Regions, Fish tracks, Database, targets file.
3 Included in Analysis By Regions, Single targets, Database, targets file. 3 Included in Analysis By Regions By Cells, Single targets, Database, targets file.
4 Included in Analysis By Regions or Analysis By Cells, Fish tracks, Database, targets file. 4a Included in Analysis By Regions, Fish tracks, Database, targets file.
5 Included in Analysis By Cells, Fish Tracks, Database, cells file. |
| Transect_ID 6, 7 Transect_name 6, 7 Transect_date_S 7 Transect_time_S 7 Transect_date_E 7 Transect_time_E 7 Transect_notes 7 |
These variables are automatically exported if there is an assigned transect group. 6 Included under Analysis By Regions, Analysis By Cells, Analysis By Regions By Cells and Analysis By Region Classes By Cells. 7 Included under Analysis By Transects. |
See also
Multibeam analysis variables
About analysis
About exporting analyses
Export variable lists
Special export values