Top left: Raw Sv data.
Bottom left: Cell statistic (Mean Sv) on raw Sv data.
Top right: Cell statistic (Mean TS) on single target data.
Bottom right: Fish per cubic metre, restricted to the cells where the mean Sv is <-64dB.
The Cell statistic and the Cell statistic (Single targets) operators accept gridded Sv data or single target data and outputs a virtual variable with the same grid; each cell's samples are set to a selected cell statistic. The available Cell statistics are: Mean, Minimum, Maximum, Median, Percentile and Number of samples/targets. Cell statistics can be used to mask original data. This combination of processes can offer information-rich visualizations, based on qualitative calculations, and enable innovative analysis insights into your data. The Cell statistic operator is licensed with the Virtual echogram module.
Note: Samples that are excluded or thresholded affect the calculation of cell statistics.
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Top left: Raw Sv data. Bottom left: Cell statistic (Mean Sv) on raw Sv data. Top right: Cell statistic (Mean TS) on single target data. Bottom right: Fish per cubic metre, restricted to the cells where the mean Sv is <-64dB. |
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The Cell Statistic operator can provide visual guidance whilst calculating TS calibration with a calibration sphere and tuning the single target detection of the sphere.
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Other cell statistics could facilitate other types orf analysis. For example, the Sawada indices Nv, NE and M would be become accessible via a Beam volume sum statistic. We plan to add the Beam volume sum statistic in the near future.
About virtual variables
Operators: Cell statistic
Operators: Match geometry
Cell statistic settings
Cell statistic algorithms
