Conversion Factors: Conversion factors have been incorporated to facilitate the conversion from backscattering cross-section to scattering cross-section and from meters to nautical miles (nmi).
Computation Approach:
Cells Selection: Cells are chosen based on their depth and distance. The distance calculation is based on latitude and longitude coordinates.
NASC Calculation: For each channel and cell, the NASC is computed using the following steps:
Multiply the Sv (in linear units) with the height of the samples. The sample height is determined as the difference between consecutive depth values.
Compute the mean of the obtained values.
Multiply the mean value by the number of samples within the selected cell per the number of pings in the same cell.
Further multiply the result by $4 \times \pi \times 1852^2$
Finally, divide the obtained result by the percentage of non-NaN samples present in the analysis.
NASC (Nautical Area Scattering Coefficient) Computation Correction
This issue is opened to propose a solution for https://github.com/OSOceanAcoustics/echopype/pull/1136
Changes Made:
Conversion Factors: Conversion factors have been incorporated to facilitate the conversion from backscattering cross-section to scattering cross-section and from meters to nautical miles (nmi).
Computation Approach: