Shoreline & Tidal Marsh Inventory

Shoreline Situation Reports were developed by VIMS in the 1970s for Virginia and have been the foundation for tidal shoreline management ever since.  Now state of the art mapping and remote sensing techniques are being used to update these historic shoreline reports for Virginia and to create new inventories in other locations.  

The latest Shoreline Inventories are being generated and published entirely in digital format.   Digital Shoreline Inventories are available for coastal Virginia, Maryland, portions of Delaware, and the Chowan River Basin in North Carolina.  Tidal Marsh Inventories are sometimes included with Shoreline Inventories.  These wetland inventories map the locations and identify plant communities observed in tidal marshes. 

General Methods

Shoreline conditions that can be observed from a small boat in the field or remotely at the desktop using high resolution imagery are characterized for each shoreline inventory.   

The shorezone is divided into three regions:

  1. the upland riparian zone next to the shoreline is evaluated for land use;
  2. the bank, or transition area from upland to the water’s edge, is evaluated for height, stability, and vegetation cover; and
  3. the shoreline, is evaluated for the presence of natural buffers such as tidal marshes and beaches; shoreline structures for shore protection (revetments, bulkheads, marsh sills, groins, jetties, offshore breakwaters, etc.); and water access structures (docks, boathouses, boatramps).

Each inventory was generated using on-screen, digitizing techniques in ArcGIS while viewing conditions observed in the most recent imagery available.  The geographic extent of each inventory is first defined with a shoreline shapefile.  Three GIS shapefiles are then generated from the digitized shoreline to classify various shoreline conditions, also called attributes.  

One shapefile describes land use and bank conditions, the second reports shoreline structures that are described as arcs or lines, and the third shapefile includes all structures that are represented as points.  A metadata file is provided with the shapefiles to define attribute accuracy, data development, and any use restrictions that pertain to the inventory data. 

More details about the methods used are provided in the reports and metadata for each shoreline inventory. 

Areas
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Disclaimer

The Comprehensive Coastal Inventory Program (CCI) and the Center for Coastal Resources Management (CCRM) provides these data with the understanding that it is 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. Neither CCI, CCRM, or the Virginia Institute of Marine Science (VIMS), or the Virginia Coastal Zone Management Program (VA-CZMP) of NOAA assume liability for any damages caused by inaccuracies in the data or documentation, or as a result of failure of the data to perform in a particular manner. CCI, CCRM, VIMS, VA-CZMP and the Commonwealth of Virginia 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. 

Use of these data in map publications, either digital or hardcopy, requires proper citation, and inclusion of the CCRM logo.   Distribution of these data is not restricted.  CCI, however, recommends metadata file(s) always remain with the data.  CCI encourages noticeable errors be reported to the contact person identified in the metadata file.