NASCData: Nautical area scattering coefficient (NASC) data
In StoXProject/RstoxBase: Base StoX Functions
NASCData R Documentation
Nautical area scattering coefficient (NASC) data
Description
The NASCData model data gives the NASC for each acoustic channel or Layer, and ESDU, PSU or Stratum.
Details
Variable Description Unit Data type Example
EDSU Unique elementary distance sampling unit (EDSU/Log) identifier None Character "2020821/2020-04-24T03:51:26.000Z"
Channel Unique NASC depth channel identifier None Character "2"
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
MinChannelDepth The minimum depth of the depth Channel m Numeric 0
MaxChannelDepth The maximum depth of the depth Channel m Numeric 10
NASCWeight The LogDistance of the EDSU 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
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 NASC. NASCData is used in SumNASC with output SumNASCData and MeanNASC with output MeanNASCData. See DataTypes for a list of all StoX data types produced by RstoxBase
StoXProject/RstoxBase documentation built on Nov. 6, 2024, noon
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| NASCData | R Documentation |
Nautical area scattering coefficient (NASC) data
Description
The NASCData model data gives the NASC for each acoustic channel or Layer, and ESDU, PSU or Stratum.
Details
| Variable | Description | Unit | Data type | Example |
| EDSU | Unique elementary distance sampling unit (EDSU/Log) identifier | None | Character | "2020821/2020-04-24T03:51:26.000Z" |
| Channel | Unique NASC depth channel identifier | None | Character | "2" |
| 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 |
| MinChannelDepth | The minimum depth of the depth Channel | m | Numeric | 0 |
| MaxChannelDepth | The maximum depth of the depth Channel | m | Numeric | 10 |
| NASCWeight | The LogDistance of the EDSU | 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 |
| 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 NASC. NASCData is used in SumNASC with output SumNASCData and MeanNASC with output MeanNASCData. See DataTypes for a list of all StoX data types produced by RstoxBase
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