20240710 11391300 1.0 FALSE P7TidalShorelineDec2023_Counties_Union_Dissolve 002 Projected GCS_North_American_1983 Linear Unit: Meter (1.000000) USA_Contiguous_Albers_Equal_Area_Conic_USGS_version <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.1.0'><WKT>PROJCS[&quot;USA_Contiguous_Albers_Equal_Area_Conic_USGS_version&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Albers&quot;],PARAMETER[&quot;False_Easting&quot;,0.0],PARAMETER[&quot;False_Northing&quot;,0.0],PARAMETER[&quot;Central_Meridian&quot;,-96.0],PARAMETER[&quot;Standard_Parallel_1&quot;,29.5],PARAMETER[&quot;Standard_Parallel_2&quot;,45.5],PARAMETER[&quot;Latitude_Of_Origin&quot;,23.0],UNIT[&quot;Meter&quot;,1.0],AUTHORITY[&quot;Esri&quot;,102039]]</WKT><XOrigin>-16901100</XOrigin><YOrigin>-6972200</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102039</WKID><LatestWKID>102039</LatestWKID></ProjectedCoordinateSystem> 20231220 09303300 20231220 09303300 150000000 5000 FGDC Esri ArcGIS 13.1.3.41833 Phase 7 Tidal Shoreline 2023-01-01T00:00:00 Andrew Fitch USGS Virginia-West Virginia Water Science Center / Chesapeake Bay Program Annapolis MD 21403 afitch@chesapeakebay.net 410-267-9835 This tidal shoreline layer of the Chesapeake Bay and the tidal portions of its tributaries was developed for use in the Chesapeake Bay Program's Phase 7 watershed and water quality models. It was derived from data provided by the Virginia Institute of Marine Science (VIMS) Center for Coastal Resources Management (CCRM). tidal shoreline Chesapeake Bay <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This tidal shoreline layer is based primarily on shoreline data provided by the Virginia Institute of Marine Science (VIMS) Center for Coastal Resources Management (CCRM), with minor modifications in six locations. In all six instances, the modifications were made using the National Oceanic and Atmospheric Administration's (NOAA) zero-foot sea level rise dataset. These modifications were as follows:</SPAN></P><UL><LI><P><SPAN>Added the Delaware portion of the tidal Nanticoke River up to the mean higher high tidal limit.</SPAN></P></LI><LI><P><SPAN>Added a braided channel in the Anacostia River in Washington, DC at Kingman Island.</SPAN></P></LI><LI><P><SPAN>Widened the Anacostia River in Washington, DC at the Washington Navy Yard.</SPAN></P></LI><LI><P><SPAN>Shortened the Rappahannock River to the mean higher high tidal limit.</SPAN></P></LI><LI><P><SPAN>Shortened the York River to the mean higher high tidal limit.</SPAN></P></LI><LI><P><SPAN>Shortened the Pamunkey River to the mean higher high tidal limit.</SPAN></P></LI></UL><P><SPAN>The VIMS source dataset is a composite of shorelines taken from shoreline inventories created by the Center for Coastal Resources Management (CCRM) at the Virginia Institute of Marine Science (VIMS), Gloucester Point, Virginia. Inventory shorelines range in publication date from 2009 to 2022 and reference imagery from high resolution imagery from Virginia's VBMP (2009, 2011, 2013, 2015, 2017, and/or 2019), NOAA Continually Updated Shoreline Product (CUSP), and Maryland's Six-Inch resolution aerial imagery (2016/2017 and 2019/2020), and are not tidally referenced.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> Center for Coastal Resources Management (CCRM), 2022. Chesapeake Bay Shoreline. Virginia Institute of Marine Science, William & Mary, Gloucester Point, Virginia. Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM) 2016 NOAA Office for Coastal Management Sea Level Rise Data: Current Mean Higher High Water Inundation Extent Charleston, SC NOAA's Ocean Service, Office for Coastal Management (OCM) https://www.coast.noaa.gov/slr https://coast.noaa.gov/digitalcoast/tools/slr https://coast.noaa.gov/slrdata Chesapeake Bay Program Office GIS Team -77.5 -75.3 39.7 36.65 1 Temporal range represents the period of time over which data were collected and processed. 2022-01-01T00:00:00 2022-12-31T00:00:00 Sea Level Rise Data: Current Mean Higher High Water Inundation Extent 2016-01-01T00:00:00 Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM) 2016 NOAA Office for Coastal Management Charleston, SC NOAA's Ocean Service, Office for Coastal Management (OCM) https://coast.noaa.gov/digitalcoast/tools/slr https://coast.noaa.gov/slrdata https://www.coast.noaa.gov/slr Chesapeake Bay Shoreline 2022-09-01T00:00:00 Center for Coastal Resources Management (CCRM), 2022. Chesapeake Bay Shoreline. Virginia Institute of Marine Science, William & Mary, Gloucester Point, Virginia. Karinna Nunez Center for Coastal Resources Management (CCRM), Virginia Institute of Marine Science 1208 Greate Road Gloucester Point Virginia 23062 karinna@vims.edu 804.684.7273 Andrew Fitch USGS Virginia-West Virginia Water Science Center / Chesapeake Bay Program Annapolis MD 21403 afitch@chesapeakebay.net 410-267-9835 Andrew Fitch File Geodatabase Feature Class dataset Esri 8.1.2 0 Simple FALSE 0 TRUE FALSE Phase 7 Tidal Shoreline Feature Class 0 Attributes for Phase 7 Tidal Shoreline feature class GIS OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. SHAPE Shape Geometry 0 0 0 Feature geometry. Esri Coordinates defining the features. FID_P7TidalShoreline_December2023 FID_P7TidalShoreline_December2023 Integer 4 0 0 SHAPE_Length Shape_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. SHAPE_Area Shape_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. 20231220 Andrew Fitch USGS Virginia-West Virginia Water Science Center / Chesapeake Bay Program Annapolis MD 21403 afitch@chesapeakebay.net 410-267-9835 Andrew Fitch Derived from VIMS shoreline data and NOAA sea level rise data. • Added the Delaware portion of the tidal Nanticoke River up to the mean higher high tidal limit. • Added a braided channel in the Anacostia River in Washington, DC at Kingman Island. • Widened the Anacostia River in Washington, DC at the Washington Navy Yard. • Shortened the Rappahannock River to the mean higher high tidal limit. • Shortened the York River to the mean higher high tidal limit. • Shortened the Pamunkey River to the mean higher high tidal limit. All processing was completed with ArcGIS Pro versions ranging from 2.9.x to 3.0.x, and the entire GIS layer was visually inspected at a scale of 1:10,000 for completeness and accuracy. Converted the VIMS shoreline feature class from lines to polygons using the Feature To Polygon tool in ArcGIS Pro 3.0. The Phase 7 models must differentiate between land and water, so it is necessary to have polygons representing those areas rather than lines delineating the shoreline. 2022-11-01T00:00:00 Added the Delaware portion of the tidal Nanticoke River, added a braided channel in the Anacostia River in Washington, DC at Kingman Island, and widened the Anacostia River in Washington, DC at the Washington Navy Yard. All three edits were made by overlaying the VIMS shoreline and the NOAA 0m sea level rise layer, splitting the NOAA 0m sea level rise layer polygons so that the correct shoreline would overlap with the VIMS shoreline, copying and pasting the split polygons into the VIMS shoreline layer, and using the Dissolve tool to combine the new polygons with the VIMS shoreline polygon. These were places where the VIMS shoreline was obviously not covering tidal areas needed for an accurate tidal shoreline layer. 2022-11-01T00:00:00 • Shortened the Rappahannock River to the mean higher high tidal limit. • Shortened the York River to the mean higher high tidal limit. • Shortened the Pamunkey River to the mean higher high tidal limit. All three edits were made by overlaying the VIMS shoreline with the NOAA 0m sea level rise layer, and splitting the VIMS shoreline polygon at the farthest extent of the NOAA layer in those rivers. The new polygons representing areas beyond tidal water were then deleted. These were places where the VIMS shoreline obviously extending beyond tidal limits. 2022-11-01T00:00:00 Layer is a closed polygon consisting of Chesapeake Bay tidal waters, with the polygon boundary representing the tidal shoreline. Layer is a closed polygon consisting of Chesapeake Bay tidal waters, with the polygon boundary representing the tidal shoreline.