Stafford County, Virginia Shoreline Situation Report - 2006

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, Virginia Institute of Marine Science

Publication_Date: 2006

Title: Stafford County, Virginia Shoreline Situation Report - 2006

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Gloucester Point, Virginia

Publisher: Virginia Institute of Marine Science

Online_Linkage: <URL:<http://www.vims.edu/ccrm/gis/gisdata.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 three coverages that are included in this metadata file; staf_lubc, staf_astru, staf_sstru. Staf_lubc (land use and bank cover for Stafford County) is an arc coverage containing data about the land use, bank height, bank cover, erosion, marsh, and beach status along the shoreline. Staf_sstru (Stafford County shoreline structures) is an arc coverage delineating hard structures in place for shoreline protection (bulkhead, riprap, groin fields). Staf_astru (Stafford County access structures) coverage is a point coverage with locations of docks, ramps, and boathouses. The attributes of these three coverages are explained in the Entity and Attribute Information section below.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20010605

Ending_Date: 20050901

Currentness_Reference: ground condition at time of survey.

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -77.63828169

East_Bounding_Coordinate: -77.2838844

North_Bounding_Coordinate: 38.51591035

South_Bounding_Coordinate: 38.23733983

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: Shoreline condition

Theme_Keyword: Shoreline structures

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Virginia

Place_Keyword: Stafford County

Place_Keyword: Rappahannock River

Place_Keyword: Potomac River

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 (VIMS)

Contact_Position: Director Comprehensive Coastal Inventory Program

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 1346

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: (804) 684-7188

Contact_Facsimile_Telephone: (804) 684-7179

Contact_Electronic_Mail_Address: marcia@vims.edu

Data_Set_Credit:

Collection of the data would not have been possible without the cooperation of VIMS Vessel Center. The following CCI staff participated in the data collection and processing: Marcia Berman, Harry Berquist, Donna Bilkovic, Sharon Killeen, Karinna Nunez, and Tami Rudnicky.

Native_Data_Set_Environment:

SunOS, 5.7, sun4u UNIX ARC/INFO version 7.2.1

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The attributes were compared to original GPS data logs for accuracy. Errors were corrected where noted.

Logical_Consistency_Report:

Chain-node topology present. Linear coverages were built for line and point coverages were built for points.

Completeness_Report:

Data was collected on the Rappahannock River up to the Rte 3 bridge in Fredericksburg. Shallow water prevented further collection in Potomac Creek and Aquia Creek.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Shoreline structures were recorded with a GPS unit as the boat moved along the shoreline. Data was transferred from the GPS boat track to an existing digital shoreline coverage by projecting data to the shoreline at a 90 degree angle from the boat track. Rectified digital orthophoto quads were used as a background coverage to aid in data positioning. Dock and boathouse point data were aligned with docks on the images. Land use features were placed along the shore so changes in land use were coincident with changes illustrated in the imagery. Positional accuracy for data that has been corrected with imagery is +/- 2 meters (equivalent to image resolution). Data not visable on the imagery (bulkheads, riprap, etc.) has a positional accuracy of +/- 11 meters. Accuracy was determined by comparing digitally processed data locations to onsite GPS ground surveys collected at random.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:

Geographic Network Division of its Department of Technology Planning (VGIN).

Publication_Date: 03012003

Title: Virginia Base Map Program Imagery and Hydrology

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Richmond, VA

Publisher:

Geographic Network Division of its Department of Technology Planning (VGIN).

Type_of_Source_Media: digital data

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 02012002

Ending_Date: 04012002

Source_Currentness_Reference: data of source photography

Source_Citation_Abbreviation: VBMP

Source_Contribution:

Images serve as a background in the map portfolios. Images are used to accurately position land use and cover data. Shoreline was extracted from the hydrology dataset.

Process_Step:

Process_Description:

Data was collected by a two-person field crew (one data collector and one boat operator/data collector) 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. The data collector records natural features including land use, bank height, bank cover, presence of marsh or beach, and shoreline stability. The boat operator collects data on the hardened structures: riprap, bulkheads, docks, boatramps, etc. Point features (docks, boathouses, ramps) were surveyed with a ten second observation recorded at 1 reading/second. Linear features were surveyed kinematically at a rate of one observation every 3 seconds. Data collection began 6/5/01 and was completed on 9/1/05.

Process_Date: 2005

Process_Step:

Process_Description:

Data from the GPS units were postprocessed on a PC with Trimble Pathfinder Office software. Postprocessing included differential correction using data collected at various CORS (continuously operating reference stations) sites. Corrected data is converted into ArcInfo coverages and transferred to a UNIX workstation for further processing.

Process_Date: 2005

Process_Step:

Process_Description:

Stafford County Shoreline was extracted from the VBMP hydrology coverage.

Source_Used_Citation_Abbreviation: VBMP

Process_Date: 2005

Process_Step:

Process_Description:

ArcMap 9.0 software on a PC was used to attribute the base shoreline. Boat-track points and arcs, VBMP imagery, and the base shoreline were displayed in ArcMap. Shoreline arcs were split using the edit tool and the spatial adjustment attribute transfer tool was used to move the attributes from the boat track to the shoreline. Arcs were split on and points were moved to locations on the shoreline that were perpendicular to the original locations on the boat-track. VBMP imagery provided additional information for placement of features. Geodatabase features were visually checked for attribute accuracy between coded shoreline and boat-track data.

Source_Used_Citation_Abbreviation: VBMP

Process_Date: 2005

Process_Step:

Process_Description:

Thirteen 1:12,000 scale plates were created for Stafford County Each plate shows three maps: riparian land use, bank and buffer conditions, and shoreline features. DOQQ imagery is displayed in the background to provide users with additional information. Maps are created using ArcMap software.

Process_Date: 2006

Process_Step:

Process_Description:

Data received a final check in hard copy map format. Changes were made as necessary to data.

Process_Date: 2006

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: 922

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Point_and_Vector_Object_Count: 443

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 944

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: .9996

Longitude_of_Central_Meridian: -75W

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.0001318726757

Ordinate_Resolution: 0.0001318726757

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: GRS80

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Below is a listing of the attributes found in the three coverages (_lubc, _sstru, and _astru). The first seven items found in the .aat files and the first four items in the .pat file are ArcInfo generated. Staf_lubc contains the following items; FEATURE or land use, has the following values: ' ' = no data, Agriculture, Bare, Commercial, Forest, Grass, Industrial, Paved, Residential, and Scrub-shrub. Height is bank height with ' ' = no data, 0 - 5 feet, 5 - 10 feet, 10 - 30 feet, and greater than 30 feet. COVER describes the bank cover with values of ' ' = no data, bare or less than 25% covered, partial coverage (25-75% coverage), and full coverage (greater than 75% coverage). EROSION is the bank erosion condition. Values can be ' ' for no data, low erosion, high erosion, or undercut. MARSH provides information on the status of the marsh; ' ' = no data, Yes(Erosion) = marsh eroding, Yes(No_Erosion) = marsh not eroding, and No = no marsh. BEACH defines ' ' = no data, Yes(Erosion) = beach eroding, Yes(No_Erosion) = beach not eroding, and No = no beach. PHRAG with the value 'yes' indicates the presence of Phragmites australis. STRUCTURE contains the types of shoreline structures found in Stafford County: bulkhead, riprap, breakwater, debris (tires, bricks, etc. tossed haphazardly along the shoreline), unconventional (concrete blocks, or other miscellaneous material placed neatly along the shoreline for stabilization), groin field, jetty, dilapidated bulkhead, and marina (<50 slips, or >50 slips). PNTSTRUC contains the types of access structures or points of interest found along the shoreline: docks/piers, boathouses, public and private ramps, outfalls (pipes open to the water), and other points of interest. GPS_DATE holds the date of data collection.

STAF_LUBC.AAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  FNODE#                 4     5     B      -
    5  TNODE#                 4     5     B      -
    9  LPOLY#                 4     5     B      -
   13  RPOLY#                 4     5     B      -
   17  LENGTH                 8    18     F      5
   25  STAF_LUBC#             4     5     B      -
   29  STAF_LUBC-ID           4     5     B      -
   33  GPS_DATE              25    25     C      -
   58  PHRAG                 25    25     C      -
   83  MARSH                 25    25     C      -
  108  EROSION               25    25     C      -
  133  COVER                 25    25     C      -
  158  HEIGHT                25    25     C      -
  183  FEATURE               25    25     C      -
  208  BEACH                 25    25     C      -


STAF_ASTRU.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   8    18     F      5
    9  PERIMETER              8    18     F      5
   17  STAF_ASTRU#            4     5     B      -
   21  STAF_ASTRU-ID          4     5     B      -
   25  ID                     4    10     B      -
   29  GPS_DATE              25    25     C      -
   54  PNTSTRUC              25    25     C      -


STAF_SSTRU.AAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  FNODE#                 4     5     B      -
    5  TNODE#                 4     5     B      -
    9  LPOLY#                 4     5     B      -
   13  RPOLY#                 4     5     B      -
   17  LENGTH                 8    18     F      5
   25  STAF_SSTRU#            4     5     B      -
   29  STAF_SSTRU-ID          4     5     B      -
   33  GPS_DATE              25    25     C      -
   58  STRUCTURE             25    25     C      -

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Virginia Institute of Marine Science (VIMS)

Contact_Position: Director Comprehensive Coastal Inventory Program

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 1346

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: (804) 684-7188

Contact_Instructions: Contact via email

Contact_Electronic_Mail_Address: marcia@vims.edu

Distribution_Liability:

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.

Metadata_Reference_Information:

Metadata_Date: 20060427

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Virginia Institute of Marine Science (VIMS)

Contact_Person: Tamia Rudnicky

Contact_Position: GIS Programmer/Analyst

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 1346

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: (804) 684-7181

Contact_Facsimile_Telephone: (804) 684-7179

Contact_Electronic_Mail_Address: tamia@vims.edu

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Access_Constraints: none

Metadata_Use_Constraints: none