Copyright © 1997-2008 Myriax Software Pty. Ltd.

Features of analysis export module

The analysis export module is the data processing module of Echoview and is used to calculate all results ("export variables") that can be exported from Echoview to ASCII data files and for use in other modules.   This module is required for echo integration, target strength analysis, fish track analysis and fish school analysis.

The module includes powerful and highly flexible features that allow researchers to use Echoview for almost any fisheries acoustic data processing.

General

• Definition of "bad data" polygons (polygon areas that are to be excluded from echo integration and other analyses).
• Definition and editing of regions (arbitrary polygons) on echograms for analysis.
• Echogram annotations.
• Flexible selection of variables for calculation and export.
• Display of per-ping analysis statistics with echograms for instant visual feedback.
• Access to operators for Sv to TS and TS to Sv Conversion.

Echo integration

• Echo integration within layers referenced to the surface or the bottom.
• Echo integration of regions (including regions defined with the schools detection module).
• Flexible echo integration reset intervals defined in time, ping or distance space.
• User classification of analysis export regions by species or other classes.
• Echo integration in layers referenced to any user defined line (e.g. a line defining the second-bottom reflection for use in acoustic bottom typing applications).
• Maximum and minimum Sv thresholds for echo integration.
• Time varied threshold following TVG curve.
• Integration of background noise levels.
• Exclude near surface and near bottom data from integrations.

TS analysis of single targets

• Echogram display of single target detections (single echoes).
• Visualization of single targets overlaid on Sv or TS echogram.
• Single target filtering by position in beam and minimum and maximum thresholds.
• TS distribution plotted on screen or exported for selections and regions.
• TS vs. depth plot on screen for selections and regions.
• Export of single target data from data files and Echoview detection algorithms.
• 3D beam graphs showing single targets in X,Y,Z space.
• Conversion of single targets into 3D objects for animated 3D visualisation.

Single target detection algorithms

• Single beam, dual beam and split beam single target detection algorithms.
• Single target filtering by position in beam and minimum and maximum thresholds.
• Detect single targets in post processing - no a priori decisions during data logging about settings.
• Experiment with the effect of different detection parameters without having to replay data through an echosounder.
• Exclude near surface and near bottom data from detection area.
• Works with high resolution data from Simrad, Kaijo, BioSonics, RDI, HTI and HAC formats.

Operators and Exports

• Use of ping subset operators.
• Use of resample operators.
• Use of the Target length calculator, Target length conversion and Target property threshold operators.
• Use of the Linear minus, Linear plus, Minus, Plus and Overlay operators.
• Use of the Threshold operator and the XxY convolution operator.
• Export of multibeam data and underlying data.
• Export of single beam data and underlying data.
• Export of 3D objects from scenes to geo-referenced image files.
• Export of analyses (including analyses from other modules).
• Export of region inspection data (also requires 3D Sonar license).
• Export of 3D single targets from scenes.