Accomack County : Shoreline Structures 2016

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

Sharon Killeen, Coastal Inventory Program, Center For Coastal Resources Management, VIMS, GIS Programmer/Analyst

Publication_Date: 20160930

Title: Accomack County : Shoreline Structures 2016

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage:

<http://ccrm.vims.edu/gis_data_maps/shoreline_inventories/index.html>

Description:

Abstract:

Shoreline Situation Reports (SSR) were first generated by VIMS in the 1970s to report the condition and status of the shore lands. The SSR series were published in hardcopy on a county by county basis for each of the Tidewater Virginia localities. The reports were intended to assist planners, managers, and regulators in decisions pertaining to management of coastal areas and natural resources therein. This report continues the process which updates and expands earlier reports. Data collected describes conditions in the immediate riparian zone, the bank, and along the shore.

Purpose: To inventory Virginia's tidal shoreline conditions.

Supplemental_Information:

There are five shapefiles assocaited with Accomack County Inventory database: AccomackCo_lubc_2016,AccomackCo_astru_2016, Accomack Co_sstru_2016, AccomackCo_tm_2016, and AccomackCo_beaches_2016. AccomackCo_lubc_2016 (land use and bank cover for Accomack County) is a linear shapefile containing data about land use, tree fringe, bank height, bank cover, bank stability and beach status along the shoreline. AccomackCo_sstru_2016 ( Accomack County shoreline structures) is a linear shapefile delineating hard structures in place at the shoreline (bulkhead, dilapidated bulkhead, riprap, wharf, unconentional, debris, marina < 50 slips, marina > 50 slips, jetty, marsh toe revetment, groinfield and breakwaters). AccomackCo_astru_2016 (Accomack County access structures) is a point shapefile with locations of docks, dilapidated docks, boathouses, and private and public boat ramps. AccomackCo_tm_2016 (Accomack County tidal marshes) shows the location, size, species and type of tidal marshes in Accomack County. AccomackCo_beaches_2016 is a linear shapefile showing the presence of beaches on the shoreline of Accomack County. The attributes of these five shapefiles are explained in the Entity and Attribute Information section below.

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -76.002106

East_Bounding_Coordinate: -75.324786

North_Bounding_Coordinate: 38.008834

South_Bounding_Coordinate: 37.476488

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword:

Land use, Land cover, Shoreline conditions, Shoreline structures, Hardened structures, Access structures, Riparian land use, Shoreline Inventory

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: farming

Theme_Keyword: boundaries

Theme_Keyword: elevation

Theme_Keyword: environment

Theme_Keyword: location

Theme_Keyword: structure

Place:

Place_Keyword_Thesaurus: None

Place_Keyword:

Pocomoke River, Pocomoke Sound,Messongo Creek,Cattail Creek, Guilford Creek, The Thorofare, Chesconessex Creek,Onancock Creek,Pungoteague Creek,Nandua Creek,Occohannock Creek, Chesapeake Bay

Access_Constraints: None

Use_Constraints:

These data should not be used for jurisdictional permit determinations beyond providing general shoreline condition or status information. These data have not been surveyed to property boundaries.The Comprehensive Coastal Inventory Program (CCI) at VIMS performs a service by distributing data generated by either CCI or public agencies which offer data without restriction or charge. CCI assumes no responsibility for data accuracy or precision, metadata completeness or correctness for digital information. CCI assumes no liability for misuse of any data which may arise as a result of any alteration, conversion, or combination with other data sources. As well, the timeliness and scale of these products must be considered when evaluating appropriate use.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Virginia Institute of Marine Science

Contact_Person: Marcia Berman

Contact_Position: Director Comprehensive Coastal Inventory Program

Contact_Address:

Address_Type: mailing and physical

Address: PO Box 1346 | Rt. 1208 Greate Rd.

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Contact_Voice_Telephone: (804) 684-7188

Contact_Electronic_Mail_Address: marcia@vims.edu

Native_Data_Set_Environment:

Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.4.0.5524

Data_Quality_Information:

Lineage:

Process_Step:

Process_Description:

A shoreline for Accomack County was created using the 2013 VBMP imagery as a backdrop and using ArcGis version 10.2. Using this as a baseline the shoreline inventory was remotely generated using two sources: Google Earth 2015 imagery , and 2013 high resolution imagery available through Bing Maps and 2013 high resolution imagery available from the Virginia Base Mapping Program (VBMP). The shoreline was coded for land use, bank height, bank condition, bank cover and the presence or absence of beach, access structures and hardened structures.

Process_Date: 20160130

Process_Step:

Process_Description:

All processing steps for the shoreline inventory were generated using ArcGIS - ArcMap v10.2.2 while viewing conditions observed in 2015 Bing high resolution oblique imagery and 2013 imagery from the Virginia Base Mapping Program (VBMP). Using the latest VBMP 2013 imagery as a background, conditions visible on shore were used to code a digital shoreline created using VBMP 2013 imagery at a scale of 1:1000. Conditions were also verified using Bing Birds Eye, VBMP 2011, and VBMP 2009 imagery. For the land use/bank cover shapefile arcs were split and coded for land use, bank height, bank cover, tree fringe and presence or absence of beach, for the access structure shapefile arcs were coded for dock, dilapidated dock, boathouse, and public and private ramps, for the shoreline structure shapefile arcs were coded for bulkhead, delapidated bulkhead, riprap, unconventional, debris, wharf, breakwater, groinfield, jetty, marsh toe revetment and marina >50 and <50 slips.

Process_Date: 20160630

Process_Step:

Process_Description:

The first and second step in the QAQC process involves complete checks of shoreline coding by a GIS Programmer/Analyst and a Marine Scientist.

Process_Date: 20160831

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 813

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 UTM Zone 18N

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -75.0

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000.0

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000002220024164500956

Ordinate_Resolution: 0.000000002220024164500956

Planar_Distance_Units: meter

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: AccomackCo_sstru_2016

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: Shoreline

Attribute:

Attribute_Label: STRUCTURE

Attribute_Definition:

Erosion control conditions at the shoreline: breakwater, bulkhead, dilapidated bulkhead, debris, groinfield, jetty, marina >50 slips, marina <50 slips, marsh toe revetment, riprap, unconventional and wharf.

Attribute_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Bulkhead

Enumerated_Domain_Value_Definition:

Bulkheads are traditionally treated wood or steel “walls” constructed to offer protection from wave attack. More recently, plastics are being used in the construction. Bulkheads are vertical structures built slightly seaward of the problem area and backfilled with suitable fill material. They function like a retaining wall, as they are designed to retain upland soil, and prevent erosion of the bank from impinging waves.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Breakwaters

Enumerated_Domain_Value_Definition:

Breakwaters are structures that sit offshore and generally occur in a parallel series along the shore. Some breakwaters are attached to the land and are referred to as headland breakwaters. Their purpose is to attenuate and deflect incoming wave energy, protecting the fastland behind and between the structures.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Debris

Enumerated_Domain_Value_Definition:

Debris represents nonconforming materials and rubble dumped along the shoreline in a haphazard manner. Debris can include tires, bricks, broken concrete rubble, and railroad ties as examples. The inventory maps Unconventional instead of Debris when the material is deliberately placed for shoreline protection in a manner similar to riprap, bulkhead, and other shoreline protection structures.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Dilapidated Bulkhead

Enumerated_Domain_Value_Definition:

Dilapidated Bulkhead – A bulkhead which has failed due to deterioration from age or storm damage is called a dilapidated bulkhead. In many cases the structure may not be able to perform erosion control functions any longer.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Groinfield

Enumerated_Domain_Value_Definition:

Groins are low profile structures that sit perpendicular to the shore. They can be constructed of rock, timber, or concrete. They are frequently set in a series known as a groinfield, which may extend along a stretch of shoreline for some distance. Unless only a single groin can be detected, this inventory does not delineate individual groins in a groinfield. The groinfield is mapped as one linear feature parallel to the shoreline running along the length of the groin series. When effective, groins will trap sediment moving alongshore.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Jetty

Enumerated_Domain_Value_Definition:

Jetty is a structure generally constructed of stone which is perpendicular to the shoreline and generally located at the entrance of tidal creeks and tributaries or marina boat basins. The function of a jetty is to prevent sediment transported alongshore from accumulating in the inlet.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Marinas: < and > 50 slips

Enumerated_Domain_Value_Definition:

Marinas are denoted as line features in this survey. The infrastructure associated with the marina (e.g. bulkheading, docks, wharfs, etc) are not digitized individually. However, if a boat ramp is noted it will be surveyed separately and coded as private. Marinas are generally commercial operations. However, smaller scale community docks offering slips and launches for residences are becoming more popular. To distinguish these facilities from commercial marinas, the user could check the riparian land use delineation. If “residential” the marina is most likely a community facility. The survey estimates the number of slips within the marina and classifies marinas as those with less than 50 slips and those with more than 50 slips.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Marsh Toe Revetment

Enumerated_Domain_Value_Definition:

aka Marsh sill) – A low revetment placed offshore from an existing marsh or new planted marsh is classified as marsh toe revetment. The structure may include tidal openings to allow for the easy exchange of free swimming organisms during tidal cycles. Marsh toe revetments are mapped as offshore linear features running along the length of the structure. Marsh toe revetments are distinguished from breakwaters by the linear placement and presence of a tidal marsh instead of a sand beach landward from the structure. The classification can include best professional judgment.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Riprap

Enumerated_Domain_Value_Definition:

aka Revetments) - Sloped structures constructed with large, heavy stone or other materials placed against the upland bank for erosion protection are classified as riprap. Riprap is mapped as a linear feature along the shoreline. Riprap is also used next to failing bulkheads (bulkhead toe revetments). The inventory maps only riprap when this type of structure is co-located with bulkheads. A similar structure is used to protect the edge of eroding marshes. This use is mapped as marsh toe revetment, not riprap.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Unconventional

Enumerated_Domain_Value_Definition:

Unconventional features represent segments along the shore where alternative material has been deliberately placed for shoreline protection. Unconventional features may include unique materials placed in a similar manner as riprap or bulkheads, such as engineered pre-cast concrete products. It may also include unique placement or arrangement of conventional materials like riprap that does not fit other structure definitions. The inventory maps Debris instead of Unconventional when the material is haphazardly scattered and not providing any shoreline protection value.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Enumerated_Domain:

Enumerated_Domain_Value: Wharf

Enumerated_Domain_Value_Definition:

Typically describes a shore parallel structure where boats are tied. In this inventory, Wharf is generally associated with large industrial, public or commercial facilities.

Enumerated_Domain_Value_Definition_Source:

Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS

Attribute:

Attribute_Label: Inv_Update

Metadata_Reference_Information:

Metadata_Date: 20160930

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

Coastal Inventory Program, Center For Coastal Resources Management, VIMS

Contact_Person: Sharon Killeen

Contact_Position: GIS Programmer/Analyst

Contact_Address:

Address_Type: mailing and physical

Address: 1375 Greate Road, P.O.Box 1346

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Country: US

Contact_Voice_Telephone: 804-684-7534

Contact_Facsimile_Telephone: 804-684-7179

Contact_Electronic_Mail_Address: sharon@vims.edu

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time