About integration algorithms

Echoview provides several distinct algorithms for integrating Sv data. They are as follows:

Algorithm

Description

Single beam - Equal sample weight

This algorithm is available for single beam data only. It makes no correction for varying sample size or ping spacing (varying ping rate or vessel speed). This algorithm does not allow for calculation of Volume_integration and dependent values.

Multibeam cruise scanning - Equal ping weight

This algorithm is available for all multibeam data. It makes no correction for varying ping spacing (varying ping rate or vessel speed). This algorithm does not allow for calculation of Volume_integration and dependent values.

H-mode cruise scanning - Furuno

This algorithm is available only for H-mode data while cruise scanning. It makes allowance for varying sample size and ping spacing (varying ping rate or vessel speed).

Note: Only the beams on the leading face of each H-mode ping are considered during school detection. All beams are considered during integration. This may lead to integration errors. A future release of Echoview will address these concerns. See also About ping modes.

V-mode cruise scanning - Furuno

This algorithm is available only for V-mode data while cruise scanning. It makes allowance for varying sample size and ping spacing (varying ping rate or vessel speed).

S-mode cruise scanning - Furuno

This algorithm is available only for S-mode data while cruise scanning. It makes allowance for varying sample size and ping spacing (varying ping rate or vessel speed).

H-mode instrument scanning - Furuno

This algorithm is available only for H-mode data while instrument scanning. It makes allowance for varying sample size and ping spacing (non-uniform tilt angle variation).

V-mode instrument scanning - Furuno

This algorithm is available only for V-mode data while cruise scanning. It makes allowance for varying sample size and ping spacing (non-uniform bearing angle variation).

Target-locked scanning - Furuno

This algorithm is applicable only to a target-locked H-mode or V-mode variable. It makes allowance for incomplete sampling of a region, by extrapolating the H-mode and V-mode data.

This algorithm uses a partially sampled analysis domain and extrapolation used to calculate the final result. As a consequence ping, beam and sample based analysis variables must be interpreted with respect to the actual data as follows:

Samples	reports the count of samples on the H-mode and V-mode pings within the analysis domain.
No_data_samples	reports the count of no data samples on the H-mode and V-mode pings within the analysis domain.
Pings	always reports 1, indicating a single target locked ping (an H-mode/V-mode pair)
Beams	reports the count of beams on the H-mode and V-mode pings within the analysis domain.

Note: These algorithm will integrate all of the samples within a specific analysis domain. One or more analysis domains can be integrated at one time. See About integration for further information.