https://doi.org/10.25773/frdc-d079

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GIS Data: 2024 Northumberland County, Virginia - Shoreline Inventory, Coastal Natural Buffers, & Marsh Migration Corridors

Document Type

Data

Department/Program

Virginia Institute of Marine Science

VIMS Department/Program

Center for Coastal Resources Management (CCRM)

Publication Date

9-30-2024

Spatial Information

See embedded metadata within geodatabase for full spatial information

Abstract

The 2024 Shoreline Inventory, Coastal Natural Buffers, and Migration Corridors layers for Northumberland County were generated using on-screen, digitizing techniques in ArcGIS® Pro v. 3.x while viewing conditions observed in Bing high-resolution oblique imagery, Google Earth, and 2021 imagery from the Virginia Base Mapping Program (VBMP). A geodatabase was developed named Northumberland_ShlInventory_NatBuffers_MarshCorridors_2024 containing the following seven features classes displaying bank conditions, shoreline features, natural buffers, and marsh migration corridors: Northumberland_BankHeightSlope_2024, Northumberland_RecreationalStructures_2024, Northumberland_ErosionControlStructures_2024, Northumberland_BeachesAndDunes_2024, Northumberland_TMI_2024, Northumberland_MarshMigrationCorridors_2ft_2024, and Northumberland_MarshMigrationCorridors_4ft_2024

Description

Geodatabase: Northumberland_ShlInventory_NatBuffers_MarshCorridors_2024

Feature classes:

  • Northumberland_BankHeightSlope_2024 - a polyline feature class containing bank height category and slope for segments of the upland shoreline.
  • Northumberland_RecreationalStructures_2024 - a polygon feature class with locations of docks, community docks, dilapidated docks, private and public boat ramps, jetties, marinas (< 50 and > 50 slips), and wharves.
  • Northumberland_ErosionControlStructures_2024 (Shoreline Protection Structures & Living Shoreline Treatments) - a polygon feature class delineating hardened shoreline structures that are used for erosion control (i.e., revetment, sill, bulkhead, breakwaters, groins, unconventional, oyster structures, and dilapidated bulkhead), as well as living shoreline treatments (breakwater with beach nourishment, marsh with sill, marsh with oyster structures [oyster bags, manufactured, natural materials), constructed oyster reef and coir logs).
  • Northumberland_BeachesAndDunes_2024 - a polygon feature class that delineates the location of beaches and dunes
  • Northumberland_TMI_2024 - a polygon feature class that shows the location, size, and community type of tidal marshes. In 2023, the tidal marsh inventory update began in conjunction with the shoreline inventory update. Marsh boundaries (updated marsh extent and distribution) were identified and mapped remotely using high-resolution color imagery from the Virginia Base Map Program (VBMP). Plant community types and other historical data from the previous inventory were maintained for marshes that intersected the same geographic location. New marshes were initially classified as having an "undetermined" plant community type. This classification was only updated if high-resolution aerial imagery or drone-based photography provided conclusive evidence of the specific plant communities present.
  • Northumberland_MarshMigrationCorridors_2ft_2024 & Northumberland_MarshMigrationCorridors_4ft_2024 - Rasters that show the potential area of the current upland expected to become marsh under 2ft and 4ft sea level rise scenario. This layer is the result of combining the outputs from four existing marsh migration models into marsh migration corridor envelopes.

The metadata file is embedded in the geodatabase and defines attribute accuracy, data development, and any use restrictions that pertain to data

Keywords

Shoreline Inventory, Tidal Marsh Inventory, Coastal Natural Buffers, Marsh Migration Corridors.

Associated Publications

GIS Data – 2024 Shoreline Management Model - Northumberland County

Publication Statement

Disclaimer: The Center for Coastal Resources Management (CCRM) provides these data with the understanding that they are not guaranteed to be correct or complete, and conclusions drawn from the data set are the sole responsibility of the user. Every attempt has been made to ensure that these data and the documentation are reliable and accurate. CCRM, the Virginia Institute of Marine Science (VIMS), and the Virginia Department of Environmental Quality, Virginia Coastal Zone Management Program assume no liability for any damages caused by inaccuracies in the data or documentation; and make no warranty, express or implied, as to the accuracy, completeness, or utility of this information, nor does the fact of distribution constitute a warranty.

Funding

This project was funded in part by the Virginia Coastal Zone Management Program at the Department of Environmental Quality through Grant #NA23NOS4190255 of the U.S. Department of Commerce, National Oceanic and Atmospheric Administration

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