Name: Large River Deltas - Tidal Polygons

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Description: The Tidal Wetland network represents the current and potential tidal wetland habitat network as polygons and their tidal connectivity determined using the Tidal Restriction network, remotely sensed aerial imagery, SHSTMP tidal wetland habitat extent and feature polygons (NOAA 2011; 2016), and Pacific Marine and Estuarine Fish Habitat Partnership (PMEP) tidal exceedance polygons (PMEP 2018). The maps of current and potential tidal wetland habitat were updated using the spatial database of the tidal restriction network developed in this project, SHSTMP tidal wetland habitat extent, feature polygons, and overwater structures (NOAA 2011; 2016; 2019), and Pacific Marine and Estuarine Fish Habitat Partnership (PMEP) tidal exceedance polygons (PMEP 2018). Tidal restrictions were buffered and used to segment PMEP wetland polygons into individual polygons, to associate tidal restriction features, feature types, and tidal connectivity ratings to polygons of tidal wetland habitat. Tidal wetland connectivity ratings were determined using the Tidal Restriction network and the SHSTMP tidal wetland habitat features to assess pathways of tidal movement and were assigned as Completely Restricted, Significantly Restricted, Partially Restricted, Unrestricted, or Unknown. Tidal wetlands were classified by both their tidal feature connectivity and landscape connectivity with certainty ratings. The feature tidal connectivity classified the tidal connectivity of the feature based on the tidal connectivity to that feature given the immediately downstream tidal restriction features. Feature tidal connectivity was determined by the downstream feature allowing tidal connectivity regardless of upstream or landward tidal restrictions connectivity restrictions. The landscape tidal connectivity classified the tidal connectivity of the wetland feature based on its connectivity to the delta as a whole. The landscape tidal connectivity of a feature was determined by the connectivity rating of the landscape wetlands and the downstream tidal restriction features.

Copyright Text:

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