MeanNASCData: Mean NASC data

In StoXProject/RstoxBase: Base StoX Functions

Mean NASC data

Description

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:

Variable	Description	Unit	Data type	Example
Survey	The survey identifier	None	Character	"MainSurvey"
Stratum	The stratum identifier	None	Character	"Stratum1"
PSU	The PSU identifier	None	Character	"PSU1"
Layer	The depth Layer identifier	None	Character	"Layer1"
Beam	Unique Beam identifier	None	Character	"38000/2"
AcousticCategory	The acoustic category	None	Character	"HER"
Frequency	The acoustic frequency of the Beam	hertz	Numeric	38000
NASC	The nautical area scattering coefficient.	m^2/nmi^2	Numeric	59.24813
MinLayerDepth	The minimum depth of the depth Layer	m	Numeric	0
MaxLayerDepth	The maximum depth of the depth Layer	m	Numeric	100
MeanNASCWeight	The total LogDistance of the PSU	None	None	0.1
ChannelReferenceType	Unique ChannelReference identifier	None	Character	"P"
ChannelReferenceDepth	The depth of the ChannelReference origin. 0 for pelagic channels. Not yet given for bottom channels, as BottomDepth is not yet defined for NMDEchosounder data	m	Numeric	0
ChannelReferenceTilt	The tilt angle of the beam, where 180 is vertically downwards and 0 is vertically upwards	degree	Numeric	180

Resolution:

Variable	Description	Unit	Data type	Example
Stratum	The stratum identifier	None	Character	"Stratum1"
PSU	The PSU identifier	None	Character	"PSU1"
EDSU	Unique elementary distance sampling unit (EDSU/Log) identifier	None	Character	"2020821/2020-04-24T03:51:26.000Z"
Layer	The depth Layer identifier	None	Character	"Layer1"
Channel	Unique NASC depth channel identifier	None	Character	"2"
Cruise	Unique Cruise identifier (see StoxAcousticFormat for output from AcousticDensity and StoxBioticFormat for output from SweptAreaDensity)	None	Character	"2021105"
EffectiveLogDistance	The effective length of the EDSU	nmi	Numeric	0.09
DateTime	UTC time at start of the EDSU or Station, stored as POSIXct	ISO8601	Character	2020-09-09T01:02:03.456Z
Longitude	Longitude at start of the EDSU or Station	degree east	Numeric	62.5
Latitude	Latitude at start of the EDSU or Station	degree north	Numeric	5.1

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

StoXProject/RstoxBase documentation built on Nov. 6, 2024, noon