Essex County and the Town of Tappahannock Shoreline Situation Report - 2001

Metadata also available as

Metadata:
Identification_Information:

Citation:
Citation_Information:
Originator:
Comprehensive Coastal Inventory, Virginia Institute of Marine Science
Publication_Date: 2001
Title:
Essex County and the Town of Tappahannock Shoreline Situation Report - 2001
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name:
Special Report in Applied Marine Science and Ocean Engineering No. 370 of the Virginia Institute of Marine Science
Issue_Identification: SRAMSOE No. 370
Publication_Information:
Publication_Place: Gloucester Point, Virginia
Publisher: Virginia Institute of Marine Science
Other_Citation_Details:
Berman, M.R., Berquist, H., Dewing, S., Glover, J., Hershner, C.H., Rudnicky, T., Schatt, D.E., and Skunda, K., 2001. Essex County and the Town of Tappahannock Shoreline Situation Report, Special Report in Applied Marine Science and Ocean Engineering No. 370, Comprehensive Coastal Inventory Program, Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, Virginia, 23062.
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; essex_lubc, essex_astru, essex_sstru. Essex_lubc (land use and bank cover for Essex County) is an arc coverage containing data about the land use, bank height, bank cover, erosion, marsh, and beach status along the shoreline. Essex_sstru (Essex County shoreline structures) is an arc coverage delineating hard structures in place for shoreline protection (bulkhead, riprap, groin fields). Essex_astru (Essex 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:
Single_Date/Time:
Calendar_Date: 1999
Currentness_Reference: ground condition at time of survey

Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.11493433
East_Bounding_Coordinate: -76.68023528
North_Bounding_Coordinate: 38.16708449
South_Bounding_Coordinate: 37.76348235

Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: Shoreline condition
Theme_Keyword: Shoreline structures
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Virginia
Place_Keyword: Rappahannock River
Place_Keyword: Essex County
Place_Keyword: Tappahannock

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: Virgina 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: Marcia Berman, Harry Berquist, Sharon Dewing, Julie Glover, Dan Schatt, Kevin Skunda, 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:
All Essex County shoreline that has a minimum depth of 2 feet at mean low water was surveyed. Areas inaccessible by boat have been remote surveyed (land use, marsh, beach, and structures coded by looking at the digital orthophoto quarter quads).

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: U.S. Geological Survey
Publication_Date: 1994
Title: Digital Orthophoto Quadrangles
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Type_of_Source_Media: color infra-red digital imagery
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19940312
Ending_Date: 19940402
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: DOQQ
Source_Contribution:
Serves as a background coverage in the map portfolios. Used to accurately position land use and cover data. Used to create a new digital shoreline coverage that serves as the base shoreline for shoreline conditions.

Process_Step:
Process_Description:
Data was collected by a three-person field crew (two data collectors and one boat operator) 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, bank cover, 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 ten second observation recorded at 1 reading/second. Linear features were surveyed kinematically at a rate of one observation every 3 seconds.
Process_Date: 1999

Process_Step:
Process_Description:
Data from the GPS units were postprocessed on a PC with Trimble Pathfinder Office software. Postprocessing included differential correction using base station data collected at the VIMS laboratory. Corrected data is converted into ArcInfo coverages and transfered to a UNIX workstation for further processing.
Process_Date: 1999

Process_Step:
Process_Description:
Using ArcInfo in the UNIX environment, a new base shoreline was created by digitizing the land-water interface illustrated on the DOQQs. Essex County boundary (determined from the USGS DLG digital dataset (1990)) set the limits for Essex shoreline.
Source_Used_Citation_Abbreviation: DOQQ
Process_Date: 2000

Process_Step:
Process_Description:
In the UNIX ArcInfo environment, boat-track points and arcs were manually shifted to the base shoreline. Arcs were split and points were moved to locations on the shoreline that were perpendicular to the original locations on the boat-track. Shoreline arcs segments and points were coded, and the coverages were visually checked for attribute accuracy between coded shoreline and boat-track data.
Source_Used_Citation_Abbreviation: DOQQ
Process_Date: 2000

Process_Step:
Process_Description:
Land use, dock, and boathouse locations were digitally checked and repositioned if necessary with DOQQ imagery displayed as a background coverage. This was done using ArcInfo's ArcEdit capabilities.
Source_Used_Citation_Abbreviation: DOQQ
Process_Date: 2000

Process_Step:
Process_Description:
Land use, bank height, marsh and beach presence, erosion, and docks were remote coded for creeks west of U.S. Route 17. Boat height restricted the navigation beyond the bridges. Remote coding was accomplished in ArcEdit with the DOQQ imagery displayed as a background coverage.
Source_Used_Citation_Abbreviation: DOQQ
Process_Date: 2000

Process_Step:
Process_Description: Data received a final check in hard copy format.
Process_Date: 2001

Process_Step:
Process_Description:
A portfolio containing twentyfour 1:12000 scale plates was created for Essex 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.
Process_Date: 2001
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: 1849
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 491
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 1013
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 965
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: 4.4045
Ordinate_Resolution: 4.4045
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
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, _astru, and _sstru). The first seven items found in the .aat files and the first four items in the .pat file are ArcInfo generated. FEATURE is land use and contains the following values: 0 = no data, 1 = forested, 2 = scrub-shrub, 3 = grass, 4 = residential, 5 = commercial, 6 = bare, and 10 = agriculture. HEIGHT is the bank height with 0 = no data, 1 = 0 - 5 feet, 2 = 5 - 10 feet, and 3 = greater than 10 feet. COVER describes the bank cover where 0 = no data, 1 = bare or less than 25% covered, 2 = partial coverage (25-75% coverage), and 3 = full coverage (greater than 75% coverage). EROS is the bank erosion condition where 0 is no data, 1 is low erosion and 2 is high erosion. MARSH defines 0 = no data, 1 = marsh eroding, 2 = marsh not eroding, and 3 = no marsh. BEACH defines 0 = no data, 1 = beach eroding, 2 = beach not eroding, and 3 = no beach. REMOTE refers to how the data was gathered: a blank value indicates the data was collected with the GPS unit, a "y" indicates that the shoreline attributes where determined from the DOQQ imagery. BTHS (boathouse), and DOCK are present if the value is 1. RAMP (boat ramp) is present with a value greater than 0, where 1 = private ramp and 2 = public ramp. PTINT contains points of interest which have been incorporated into the _sstru coverage. BLKHD (bulkhead), RPRP (riprap), MARINA, GROIN (groin field) and JETTY are present with a value of 1. 

ESSEX_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                 4    12     F      3
   21  ESSEX_LUBC#            4     5     B      -
   25  ESSEX_LUBC-ID          4     5     B      -
   29  FEATURE                2     2     I      -
   31  HEIGHT                 1     1     I      -
   32  COVER                  1     1     I      -
   33  EROS                   1     1     I      -
   34  MARSH                  1     1     I      -
   35  BEACH                  1     1     I      -
   36  REMOTE                 2     2     C      -


ESSEX_ASTRU.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   4    12     F      3
    5  PERIMETER              4    12     F      3
    9  ESSEX_ASTRU#           4     5     B      -
   13  ESSEX_ASTRU-ID         4     5     B      -
   17  BTHS                   2     2     I      -
   19  DOCK                   2     2     I      -
   21  RAMP                   2     2     I      -
   23  PTINT                 30    30     C      -
   53  REMOTE                 2     2     C      -


ESSEX_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                 4    12     F      3
   21  ESSEX_SSTRU#           4     5     B      -
   25  ESSEX_SSTRU-ID         4     5     B      -
   29  BLKHD                  4     4     I      -
   33  RPRP                   4     4     I      -
   37  MARINA                 4     4     I      -
   41  GROIN                  4     4     I      -
   45  JETTY                  2     2     I      -
Entity_and_Attribute_Detail_Citation: none
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Virgina 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: 20010403
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
Generated by mp version 2.5.4 on Mon Jun 18 08:12:21 2001