The Quantity model data holds the abundance and biomass of individuals as number and weight, respectively, per Stratum and Layer. The data type contains the tables Data and Resolution with variables given in the following tables:
Data:
| Variable | Description | Unit | Data type | Example | Occurrence |
| Survey | The survey identifier | None | Character | "MainSurvey" | Always |
| Stratum | The stratum identifier | None | Character | "Stratum1" | Always |
| Layer | The depth Layer identifier | None | Character | "Layer1" | Always |
| Beam | Unique Beam identifier | None | Character | "38000/2" | AcousticDensity |
| SpeciesCategory | The species category | None | Character | "Herring" | Always |
| IndividualTotalLength | Total length (from snout to end of fin), given as the lower end of the interval of width given by LengthResolution | cm | Numeric | 14.5 | SweptAreaDensity |
| LengthResolution | Resolution of IndividualTotalLength | cm | Numeric | 0.5 | SweptAreaDensity |
| Frequency | The acoustic frequency of the Beam | hertz | Numeric | 38000 | AcousticDensity |
| Abundance | The number of individuals | individuals | Numeric | 1234567.8 | If MeanDensityType is"AreaNumberDensity" in the input MeanDensityData |
| Biomass | The total weight of the species | kg | Numeric | 123456.7 | If DensityType is "AreaWeightDensity" (only relevant when SweptAreaDensityMethod is "TotalCatch" in SweptAreaDensity) |
| MinLayerDepth | The minimum depth of the depth Layer | m | Numeric | 0 | Always |
| MaxLayerDepth | The maximum depth of the depth Layer | m | Numeric | 100 | Always |
Resolution:
| Variable | Description | Unit | Data type | Example | Occurrence |
| Stratum | The stratum identifier | None | Character | "Stratum1" | Always |
| PSU | The PSU identifier | None | Character | "PSU1" | Always |
| EDSU | Unique elementary distance sampling unit (EDSU/Log) identifier | None | Character | "2020821/2020-04-24T03:51:26.000Z" | AcousticDensity |
| Station | Unique Station identifier | None | Character | "2021105-1" | SweptAreaDensity |
| Layer | The depth Layer identifier | None | Character | "Layer1" | Always |
| Channel | Unique NASC depth channel identifier | None | Character | "2" | AcousticDensity |
| Cruise | Unique Cruise identifier (see StoxAcousticFormat for output from AcousticDensity and StoxBioticFormat for output from SweptAreaDensity) | None | Character | "2021105" | Always |
| EffectiveLogDistance | The effective length of the EDSU | nmi | Numeric | 0.09 | AcousticDensity |
| EffectiveTowDistance | Effective tow distance of the Haul | nmi | Numeric | 1.5 | SweptAreaDensity |
| DateTime | UTC time at start of the EDSU or Station, stored as POSIXct | ISO8601 | Character | 2020-09-09T01:02:03.456Z | Always |
| Longitude | Longitude at start of the EDSU or Station | degree east | Numeric | 62.5 | Always |
| Latitude | Latitude at start of the EDSU or Station | degree north | Numeric | 5.1 | Always |
| VerticalNetOpening | Vertical span of the net | m | Numeric | 23 | SweptAreaDensity |
| HorizontalNetOpening | Vertical span of the net | m | Numeric | 105 | SweptAreaDensity |
| TrawlDoorSpread | Distance between the trawl doors. | m | Numeric | 125 | SweptAreaDensity |