Underlying theory#
This section contains information about the acoustic and spatial statistics theories underlying the computation implemented in Echopop.
The Acoustics basics page contains information about important acoustic quantities for deriving biological estimates in general.
The flow of computation in Echopop that combines acoustic data and biological data from trawls to derive biomass estimates is described across a few pages:
Biological estimates: derive number density from acoustic data.
Stratification to obtain population estimates: derive biomass density by combining. number density and animal length-weight information from trawl data.
The other pages contains detailed information of spatial statistics used for kriging:
Characterizing spatial correlation: characterizing spatial variability using semivariograms.
Theoretical semivariogram equations: equations of different semivariogram models.
Interpolating spatial fields: interpolating observations using geostatistical estimates based on the empirical and theoretical semivariograms.