The MeanLengthDistributionData model data is a list of two elements; the Data, which are similar to LengthDistributionData 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, Station, Layer and Haul containing the link between the horizontal and vertical resolution variables before summing and averaging.
Data:
| 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" | SpeciesCategory | The species category | None | Character |
| "Herring" | 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 |
| LengthResolution | Resolution of IndividualTotalLength | cm | Numeric | 0.5 | WeightedNumber |
| The number of individuals of the length group. | None | Numeric | 12 | MinLayerDepth | The minimum depth of the depth Layer |
| m | Numeric | 0 | MaxLayerDepth | The maximum depth of the depth Layer | m |
| Numeric | 100 | MeanLengthDistributionWeight | The weight of the WeightedNumber, equal to the number of Stations of the PSU | None | Numeric |
| 1 | LengthDistributionType | The type of length distribution, one of "Normalized", "Standard" and "Percent" (see LengthDistribution) | None | Character | "AreaNumberDensity" |
| Cruise | Unique Cruise identifier (see StoxAcousticFormat for output from AcousticDensity and StoxBioticFormat for output from SweptAreaDensity) | None | Character | "2021105" | EffectiveTowDistance |
| Effective tow distance of the Haul | nmi | Numeric | 1.5 | 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 |
Resolution:
| Variable | Description | Unit | Data type | Example |
| Stratum | The stratum identifier | None | Character | "Stratum1" |
| PSU | The PSU identifier | None | Character | "PSU1" |
| Station | Unique Station identifier | None | Character | "2021105-1" |
| Layer | The depth Layer identifier | None | Character | "Layer1" |
| Haul | Unique Haul identifier | None | Character | "2021105-1-2" |
| Cruise | Unique Cruise identifier (see StoxAcousticFormat for output from AcousticDensity and StoxBioticFormat for output from SweptAreaDensity) | None | Character | "2021105" |
| EffectiveTowDistance | Effective tow distance of the Haul | nmi | Numeric | 1.5 |
| 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 |
| Gear | Identifier of the gear | None | Character | "3270" |
| VerticalNetOpening | Vertical span of the net | m | Numeric | 23 |
| HorizontalNetOpening | Vertical span of the net | m | Numeric | 105 |
| TrawlDoorSpread | Distance between the trawl doors. | m | Numeric | 125 |
This data type is produced by MeanLengthDistribution with input LengthDistributionData from LengthDistribution or SumLengthDistributionData from SumLengthDistribution. See DataTypes for a list of all StoX data types produced by RstoxBase