Name: Percent Sediment Type - Mud

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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 serve as a base layer for that model. Five different sediment grain sizes plus a steep and deep habitat type are represented in the dataset, which indicates the proportion of each grain size occurring within each 5x5 km grid cell based on available data (primarily from the USGS and SMAST drop camera survey dataset). In areas where there were existing polygon interpretations of sediments, these are used instead of the point-based interpolations to determine the percent sediment values in the final sediment dataset. For each grid cell, the proportions across the five grain sizes and steep and deep habitat type sum to 1, such that the area of the grid cell is fully allocated to one or more of the six conditions. The legends and color ramps for each of the five grain size layers are unique so as to display the range of variability within each layer. The model domain is fromthe U.S./Canadian border to the N.C./S.C. border, and inshore to offshore from the coastline to the Exclusive Economic Zone boundary. <br/> <br/> A secondary purpose for these maps of sediment grain sizes is to inform various spatial planning issues where seabed type is a consideration for decision making. It is important to understand caveats and 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. 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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