This dataset was collected by staff of the Environmental Data Center (EDC) at The University of Rhode Island in cooperation with the Northeast Coastal and Barrier Network (NCBN) of the National Park Service (NPS) under the project: Field Technician Support for Elevation Mapping of NPS Salt Marshes and other sites for Sea Level RIse Planning and Post- and Future Storm Evaluation which is a modification to Task Agreement P13ACAC00891 of Cooperative Agreement P09AC00212 Elevation Mapping of Critical Park Areas for Planning and Post- and Future Storm Evaluation and Modeling. The data was collected from Summer 2014 to Fall 2016 at Assateague Island National Seashore (ASIS), Fire Island National Seashore (FIIS), and Gateway National Recreation Area-Sandy Hook Unit. These datasets consist of point locations where vegetation surveys were conducted in salt marshes. Sample locations were determined by overlaying a 20 meter grid of points on salt marsh sites determined by the NCBN. Field crews navigated to every grid point, placed a meter square plot on the ground and sampled vegetation, identifying species type and percent cover (using the Braun-Blaunquet cover-abundance scale). At any given point/plot there may be multiple points with the same coordinates representing the different species present at that location. High accuracy elevation data was also collected at the same locations using RTK-GPS equipment. This data can be found in the same project folder on the NPS Integrated Resource Management Applications (IRMA) website.

This dataset was collected by staff of the Environmental Data Center (EDC) at The University of Rhode Island (URI) in cooperation with the Northeast Coastal and Barrier Network (NCBN) of the National Park Service (NPS) under the project: Field Technician Support for Elevation Mapping of NPS Salt Marshes and other sites for Sea Level Rise Planning and Post- and Future Storm Evaluation which is a modification to Task Agreement P13ACAC00891 of Cooperative Agreement P09AC00212 Elevation Mapping of Critical Park Areas for Planning and Post- and Future Storm Evaluation and Modeling. The data was collected from Fall, 2014 to Spring, 2016 at Assateague Island National Seashore (ASIS), Fire Island Island National Seashore (FIIS), and Gateway National Recreation Area-Sandy Hook Unit (GATE-SHU). This dataset consists of point locations where survey grade GPS devices were used to collect Northing, Easting, and Elevation values. Northing and Easting values are referenced to NAD83 (2011) UTM Zone 18 and Elevation is referenced to the North American Vertical Datum of 1988 (NAVD88) (Geoid12A). Locations for the points were chosen by overlaying a 20 meter grid over survey site boundaries and surveying a point at the centroids of the grid. Points were surveyed with Trimble R10 GPS receivers using Real Time Kinematic (RTK) and Post Processed Kinematic (PPK) survey styles.

This dataset was collected by staff of the Environmental Data Center (EDC) at The University of Rhode Island (URI) in cooperation with the Northeast Coastal and Barrier Network (NCBN) of the National Park Service (NPS) under the project: Field Technician Support for Elevation Mapping of NPS Salt Marshes and other sites for Sea Level Rise Planning and Post- and Future Storm Evaluation which is a modification to Task Agreement P13ACAC00891 of Cooperative Agreement P09AC00212 Elevation Mapping of Critical Park Areas for Planning and Post- and Future Storm Evaluation and Modeling. The data was collected from Fall, 2014 to Spring, 2016 at Assateague Island National Seashore (ASIS), Fire Island Island National Seashore (FIIS), and Gateway National Recreation Area-Sandy Hook Unit (GATE-SHU). This dataset consists of point locations where survey grade GPS devices were used to collect Northing, Easting, and Elevation values. Northing and Easting values are referenced to NAD83 (2011) UTM Zone 18 and Elevation is referenced to the North American Vertical Datum of 1988 (NAVD88) (Geoid12A). Locations for the points were chosen by overlaying a 20 meter grid over survey site boundaries and surveying a point at the centroids of the grid. Points were surveyed with Trimble R10 GPS receivers using Real Time Kinematic (RTK) and Post Processed Kinematic (PPK) survey styles.

This dataset was collected by staff of the Environmental Data Center (EDC) at The University of Rhode Island (URI) in cooperation with the Northeast Coastal and Barrier Network (NCBN) of the National Park Service (NPS) under the project: Field Technician Support for Elevation Mapping of NPS Salt Marshes and other sites for Sea Level Rise Planning and Post- and Future Storm Evaluation which is a modification to Task Agreement P13ACAC00891 of Cooperative Agreement P09AC00212 Elevation Mapping of Critical Park Areas for Planning and Post- and Future Storm Evaluation and Modeling. The data was collected from Fall, 2014 to Spring, 2016 at Assateague Island National Seashore (ASIS), Fire Island Island National Seashore (FIIS), and Gateway National Recreation Area-Sandy Hook Unit (GATE-SHU). This dataset consists of point locations where survey grade GPS devices were used to collect Northing, Easting, and Elevation values. Northing and Easting values are referenced to NAD83 (2011) UTM Zone 18 and Elevation is referenced to the North American Vertical Datum of 1988 (NAVD88) (Geoid12A). Locations for the points were chosen by overlaying a 20 meter grid over survey site boundaries and surveying a point at the centroids of the grid. Points were surveyed with Trimble R10 GPS receivers using Real Time Kinematic (RTK) and Post Processed Kinematic (PPK) survey styles.

This dataset was collected by staff of the Environmental Data Center (EDC) at The University of Rhode Island (URI) in cooperation with the Northeast Coastal and Barrier Network (NCBN) of the National Park Service (NPS) under the project: Field Technician Support for Elevation Mapping of NPS Salt Marshes and other sites for Sea Level Rise Planning and Post- and Future Storm Evaluation which is a modification to Task Agreement P13ACAC00891 of Cooperative Agreement P09AC00212 Elevation Mapping of Critical Park Areas for Planning and Post- and Future Storm Evaluation and Modeling. The data was collected from Fall, 2014 to Spring, 2016 at Assateague Island National Seashore (ASIS), Fire Island Island National Seashore (FIIS), and Gateway National Recreation Area-Sandy Hook Unit (GATE-SHU). This dataset consists of point locations where survey grade GPS devices were used to collect Northing, Easting, and Elevation values. Northing and Easting values are referenced to NAD83 (2011) UTM Zone 18 and Elevation is referenced to the North American Vertical Datum of 1988 (NAVD88) (Geoid12A). Locations for the points were chosen by overlaying a 20 meter grid over survey site boundaries and surveying a point at the centroids of the grid. Points were surveyed with Trimble R10 GPS receivers using Real Time Kinematic (RTK) and Post Processed Kinematic (PPK) survey styles.

This dataset was collected by staff of the Environmental Data Center (EDC) at The University of Rhode Island (URI) in cooperation with the Northeast Coastal and Barrier Network (NCBN) of the National Park Service (NPS) under the project: Field Technician Support for Elevation Mapping of NPS Salt Marshes and other sites for Sea Level Rise Planning and Post- and Future Storm Evaluation which is a modification to Task Agreement P13ACAC00891 of Cooperative Agreement P09AC00212 Elevation Mapping of Critical Park Areas for Planning and Post- and Future Storm Evaluation and Modeling. The data was collected from Fall, 2014 to Spring, 2016 at Assateague Island National Seashore (ASIS), Fire Island Island National Seashore (FIIS), and Gateway National Recreation Area-Sandy Hook Unit (GATE-SHU). This dataset consists of point locations where survey grade GPS devices were used to collect Northing, Easting, and Elevation values. Northing and Easting values are referenced to NAD83 (2011) UTM Zone 18 and Elevation is referenced to the North American Vertical Datum of 1988 (NAVD88) (Geoid12A). Locations for the points were chosen by overlaying a 20 meter grid over survey site boundaries and surveying a point at the centroids of the grid. Points were surveyed with Trimble R10 GPS receivers using Real Time Kinematic (RTK) and Post Processed Kinematic (PPK) survey styles.

The data set includes vector reports of kinematic observations between the base station used for each survey and the rover points.

The data set includes vector reports of kinematic observations between the base station used for each survey and the rover points.

The salt marsh complex of Assateague Island National Seashore (ASIS) and Chincoteague Bay was delineated to smaller, conceptual marsh units by geoprocessing of surface elevation data. Flow accumulation based on the relative elevation of each location is used to determine the ridge lines that separate each marsh unit while the surface slope is used to automatically assign each unit a drainage point, where water is expected to drain through. Through scientific efforts initiated with the Hurricane Sandy Science Plan, the U.S. Geological Survey has been expanding national assessment of coastal change hazards and forecast products to coastal wetlands, including the Assateague Island National Seashore and Chincoteague Bay salt marshes, with the intent of providing Federal, State, and local managers with tools to estimate the vulnerability and ecosystem service potential of these wetlands. For this purpose, the response and resilience of coastal wetlands to physical factors need to be assessed in terms of the ensuing change to their vulnerability and ecosystem services.

This data release contains coastal wetland synthesis products for the Atlantic-facing Eastern Shore of Virginia (the data release for the Chesapeake Bay-facing portion of the Eastern Shore of Virginia is found here: https://doi.org/10.5066/P997EJYB). Metrics for resiliency, including unvegetated to vegetated ratio (UVVR), marsh elevation, and tidal range are calculated for smaller units delineated from a digital elevation model, providing the spatial variability of physical factors that influence wetland health. The U.S. Geological Survey has been expanding national assessment of coastal change hazards and forecast products to coastal wetlands with the intent of providing federal, state, and local managers with tools to estimate the vulnerability and ecosystem service potential of these wetlands. For this purpose, the response and resilience of coastal wetlands to physical factors need to be assessed in terms of the ensuing change to their vulnerability and ecosystem services.