Swept-area density — SweptAreaDensity • RstoxBase

This function calculates the area density of fish as number of individuals or weight (kg) per square nautical mile, as determined by the DensityType.

SweptAreaDensity(
  SweptAreaDensityMethod = c("LengthDistributed", "TotalCatch"),
  MeanLengthDistributionData,
  MeanSpeciesCategoryCatchData,
  SweepWidthMethod = c("Constant", "PreDefined"),
  SweepWidth = double(),
  DensityType = character()
)

Arguments

SweptAreaDensityMethod: The method to use for the swept-area calculation, one of \"LengthDistributed\" for calculating density from the length distribution (MeanLengthDistributionData), and \"TotalCatch\" for calculating density from the total catch (MeanSpeciesCategoryCatchData).
MeanLengthDistributionData: The MeanLengthDistributionData data.
MeanSpeciesCategoryCatchData: The MeanSpeciesCategoryCatchData data.
SweepWidthMethod: The method for calculating the sweep width. Possible options are (1) "Constant", which requires SweepWidth to be set as the constant sweep width, and (2) "PreDefined", impying that the sweep width is already incorporated in the WeightedNumber in the MeanLengthDistributionData using link{GearDependentLengthDistributionCompensation} or link{LengthDependentLengthDistributionCompensation}, or in the MeanSpeciesCategoryCatchData using link{GearDependentSpeciesCategoryCatchCompensation}.
SweepWidth: The constant sweep width in meters.
DensityType: The requested density type, currently only "AreaNumberDensity" is supported for SweptAreaDensityMethod = "LengthDistributed", and one of "AreaNumberDensity" and "AreaWeightDensity" (kg) for SweptAreaDensityMethod = "TotalCatch". All area densities are given per square nautical mile.

Value

An object of StoX data type DensityData. Note that the Density column of the Data table has unit kg nmi^-2 if SweptAreaDensityMethod is "TotalCatch" and DensityType is "AreaWeightensity". See also QuantityData