Name: Sediment Data Density

Display Field: GridID

Type: Feature Layer

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Description: This dataset constitutes a portion of the input data for the Northeast Fishing Effects Model (Fishing Effects), and its primary purpose is to indicate the number of data points occurring within each 5x5 grid cell (data density). Sediment type and diversity values in cells with fewer observations may be less reliable than values calculated for grids with more grain size observations. This layer essentially serves as a data quality assessment, so users can visualize the limitations associated with both the underlying source data and this compilation when using the data for spatial planning. These limitations and caveats influence the Fishing Effects model percent habitat disturbance results as well. <br/> <br/> In areas where there were existing polygon interpretations of sediments, the polygons were used instead of the point-based interpolations to determine the percent sediment values in the final sediment dataset. The polygon data are not included in this sediment data density product, only points. The detailed metadata document includes maps of where polygon data were used to classify habitat type. The methods for generating the percent sediment grid, including the use of polygon vs. point data in specific locations, are explained in the metadata document for that dataset. Additional information about the model can be found on the <a href="https://www.nefmc.org/library/fishing-effects-model" target="_blank">New England Fishery Management Council's Fishing Effects</a> page.

Definition Expression: N/A

Copyright Text: New England Fishery Management Council, 2020. For questions contact Michelle Bachman, mbachman@nefmc.org

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Spatial Reference: 102100  (3857)

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