The MeanNASCData model data is a list of two elements; the Data, which are similar to NASCData but added the Layer vertical resolution column and the Stratum and PSU horizontal resolution columns, and summed vertically and averaged horizontally; and the Resolution, which is a table of the five columns Stratum, PSU, EDSU, Layer and Channel containing the link between the horizontal and vertical resolution variables before summing and averaging.

Details

Data:

VariableDescriptionUnitData typeExample
SurveyThe survey identifierNoneCharacter"MainSurvey"
StratumThe stratum identifierNoneCharacter"Stratum1"
PSUThe PSU identifierNoneCharacter"PSU1"
LayerThe depth Layer identifierNoneCharacter"Layer1"
BeamUnique Beam identifierNoneCharacter"38000/2"
AcousticCategoryThe acoustic categoryNoneCharacter"HER"
FrequencyThe acoustic frequency of the BeamhertzNumeric38000
NASCThe nautical area scattering coefficient.m^2/nmi^2Numeric59.24813
MinLayerDepthThe minimum depth of the depth LayermNumeric0
MaxLayerDepthThe maximum depth of the depth LayermNumeric100
MeanNASCWeightThe total LogDistance of the PSUNoneNone0.1
ChannelReferenceTypeUnique ChannelReference identifierNoneCharacter"P"
ChannelReferenceDepthThe depth of the ChannelReference origin. 0 for pelagic channels. Not yet given for bottom channels, as BottomDepth is not yet defined for NMDEchosounder datamNumeric0
ChannelReferenceTiltThe tilt angle of the beam, where 180 is vertically downwards and 0 is vertically upwardsdegreeNumeric180

Resolution:

VariableDescriptionUnitData typeExample
StratumThe stratum identifierNoneCharacter"Stratum1"
PSUThe PSU identifierNoneCharacter"PSU1"
EDSUUnique elementary distance sampling unit (EDSU/Log) identifierNoneCharacter"2020821/2020-04-24T03:51:26.000Z"
LayerThe depth Layer identifierNoneCharacter"Layer1"
ChannelUnique NASC depth channel identifierNoneCharacter"2"
CruiseUnique Cruise identifier (see StoxAcousticFormat for output from AcousticDensity and StoxBioticFormat for output from SweptAreaDensity)NoneCharacter"2021105"
EffectiveLogDistanceThe effective length of the EDSUnmiNumeric0.09
DateTimeUTC time at start of the EDSU or Station, stored as POSIXctISO8601Character2020-09-09T01:02:03.456Z
LongitudeLongitude at start of the EDSU or Stationdegree eastNumeric62.5
LatitudeLatitude at start of the EDSU or Stationdegree northNumeric5.1

See also

This data type is produced by MeanNASC with input NASCData from NASC or SumNASCData from SumNASC. See DataTypes for a list of all StoX data types produced by RstoxBase