Fairfax County Shoreline Structures

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator:

Comprehensive Coastal Inventory Program, Virginia Institute of Marine Science

Publication_Date: 2010

Title: Fairfax County Shoreline Structures

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 1970's 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 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 Shoreline Inventory report continues a process which updates and expands the earlier reports. Data collected reports conditions surveyed in the immediate riparian zone, the bank, and along the shoreline.

Purpose: To inventory Virginia's tidal shoreline conditions.

Supplemental_Information:

There are three shapefiles that are part of the 2010 Fairfax County Shoreline Inventory database: fairfax_lubc, fairfax_astru, fairfax_sstru. Fairfax_lubc (land use and bank cover for Fairfax County) is a linear shapefile containing data about land use, tree fringe, canopy overhang, bank height, bank cover, erosion, Phragmites australis, marsh, and beach status along the shoreline. Fairfax_sstru (Fairfax County shoreline structures) is a linear shapefile delineating hard structures in place at the shoreline (bulkhead, breakwater,debris, dilapidated bulkhead, riprap, jetty, marina, marsh toe revetment, wharf, unconventional, groinfields). Fairfax_astru (Fairfax County access structures) is a point shapefile with locations of docks, ramps, dilapidated docks, outfalls and boathouses. The attributes of these three shapefiles are explained in the Entity and Attribute Information section below.

Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 6/7/2010

Single_Date/Time:

Calendar_Date: 6/8/2010

Single_Date/Time:

Calendar_Date: 8/16/2010

Currentness_Reference: ground condition of survey

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -77.267694

East_Bounding_Coordinate: -77.038292

North_Bounding_Coordinate: 38.800023

South_Bounding_Coordinate: 38.616615

Keywords:

Theme:

Theme_Keyword: Shoreline conditions

Theme_Keyword: Shoreline inventory

Theme_Keyword: Shoreline structures

Theme_Keyword: Shoreline structures

Place:

Place_Keyword: Potomac River

Place_Keyword: Occoquan Bay

Place_Keyword: Pohick Bay

Place_Keyword: Accotink Bay

Place_Keyword: Hunting Creek

Place_Keyword: Little Hunting Creek

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.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Marcia Berman

Contact_Organization: Virginia Institute of Marine Science

Contact_Position: Director of Comprehensive Coastal Inventory Program

Contact_Address:

Address_Type: mailing and physical address

Address: P.O.Box 1346 Greate Road

City: Gloucester Point

State_or_Province: VA

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: 804-684-7188

Contact_Facsimile_Telephone: 804-684-7179

Contact_Electronic_Mail_Address: marcia@vims.edu

Native_Data_Set_Environment:

Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.3000

Data_Quality_Information:

Lineage:

Process_Step:

Process_Description:

Data was collected by a two-person field crew (one person collecting land use and bank condition data and one boat operator also collecting shoreline features) using two hand-held Trimble GeoExplorers GPS Units, while navigating along the shoreline. A data dictionary designed for the inventory was installed on each GPS Unit. One data collector records natural features including land use, bank height, presence of marsh or beach, and shoreline stability. A second person collects data on the hardened structures: riprap, bulkheads, docks, boatramps, etc. Point features (docks, boathouses, ramps) were surveyed with a six second observation recorded at 1 reading/second. Linear features were surveyed kinematically at a rate of one observation every 3 seconds.

Process_Date: 2010

Process_Step:

Process_Description:

Data from the GPS units were postprocessed on a PC with Trimble Pathfinder Office software. Postprocessing includes differential correction using base station data collected at the VIMS laboratory. Corrected data is converted to shapefiles for further processing.

Process_Step:

Process_Description:

In the ArcMap environment, boat-track arcs were manually shifted to the base shoreline (VBMP). Arcs were split and moved to locations on the shoreline perpendicular to the original locations on the boat-track. Shoreline arc segments were coded, and the shapefiles were visually checked for attribute accuracy between coded shoreline and boat-track data.

Process_Step:

Process_Description:

In ArcMap, boat-track points were manually shifted to the base shoreline (VBMP). Points were moved to locations on the shoreline perpendicular to the original locations on the boat-track. Points were coded and the access structure (astru) was visually checked for attribute accuracy between coded shoreline and boat-track data.

Process_Step:

Process_Description:

Land use, dock, and boathouse locations were digitally checked and repositioned if necessary with VBMP imagery displayed as a background coverage. This was done using ArcMap capabilities. Areas inaccessible by boat due to low tide were coded based on features observed on the imagery. The "remote" coded areas were given the item REMOTE = "yes" to distinquish them from GPS collected data.

Process_Step:

Process_Description:

A portfolio for Fairfax County. Each plate shows four maps: riparian land use, bank conditions, shoreline features, and natural buffers. VBMP (2009) Infrared WGS imagery is displayed in the background to provide users with additional information.

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: 459

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 18

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -75.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000

Ordinate_Resolution: 0.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: fairfax_sstru

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: LENGTH

Attribute:

Attribute_Label: GPS_Date

Attribute_Definition: Date of survey

Attribute:

Attribute_Label: GPS_Time

Attribute_Definition: Time of survey

Attribute:

Attribute_Label: Feat_Name

Attribute_Definition: Structure type

Attribute:

Attribute_Label: Size

Attribute_Definition: Marina boat slips

Attribute:

Attribute_Label: STRUCTURE

Attribute_Definition: Structure type

Attribute:

Attribute_Label: REMOTE

Attribute_Definition: Remotely coded in lab

Distribution_Information:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 0.471

Metadata_Reference_Information:

Metadata_Date: 20130228

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Sharon Killeen

Contact_Organization: Comprehensive Coastal Inventory Program

Contact_Position: GIS Programmer /Analyst

Contact_Address:

Address_Type: mailing and physical address

Address: P.O.Box 1346 Greate Road

City: Gloucester Point

State_or_Province: VA

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: 804-684-7534

Contact_Facsimile_Telephone: 804-684-7179

Contact_Electronic_Mail_Address: sharon@vims.edu

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile