Chesapeake Bay Bottom Type in Virginia - Dexter Haven Data Set

Identification_Information:
Citation:
Citation_Information:
Originator: Comprehensive Coastal Inventory, Center for Coastal Resources Management, Virginia Institute of Marine Science (VIMS)
Publication_Date: 2001
Title: Dexter Havens Chesapeake Bay Bottom Type Data Set - Virginia
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract: The public oyster grounds (Baylor Survey Grounds) were evaluated for the suitability of oyster culture with respect to bottom type from 1978 to 1981. Bottom types were determined using probing pipes, patent tongs, and an acoustical device. These data were transferred to 1:10,000 charts for hardcopy publication purposes. They were later drafted to stable-based mylar sheets and digitized in ArcInfo to create a digital coverage.       
Bottom probe surveys were conducted in the 1970’s on surveyed public Baylor Ground using probes, sonic gear, and patent tongs.  Bottom types were recorded as oyster rock, shell-mud, shell-sand, sand, gravel, mud or buried shell.
Purpose: The purpose of the data is to report bottom substrate condition as an indicator of bottom potentially suitable for growing oyster reefs.
Supplemental_Information:
To map productive or potentially productive areas for oyster reef restoration activities. To identify areas within public oyster grounds with hard bottom composed of shell or shell rock. For more information on methodology, please refer to Haven, D.S., & J.P. Whitcomb. 1983. The Origin and Extent of Oyster Reefs in the James River, Virginia. Journal of Shellfish Research, Vol. 3, No. 2, 141-151.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1978
Ending_Date: 1981
Currentness_Reference:
Bottom substrate condition at time of survey
Status: Complete
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.769754
East_Bounding_Coordinate: -75.289824
North_Bounding_Coordinate: 38.178596
South_Bounding_Coordinate: 36.894991 Keywords:
Theme:
Theme_Keyword: oyster rock
Theme_Keyword: shell-mud
Theme_Keyword: shell-sand
Theme_Keyword: sand
Theme_Keyword: gravel
Theme_Keyword: mud
Theme_Keyword: buried shell
Place:
Place_Keyword: Virginia
Place_Keyword: Chesapeake Bay
Place_Keyword: York River
Place_Keyword: James River
Place_Keyword: Rappahannock River
Place_Keyword: Piankatank River
Place_Keyword: Potomac River
Access_Constraints: none
Use_Constraints:
These data should only be used for providing general location information. Bottom conditions may have changed since survey.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Marcia Berman
Contact_Organization: Virginia Institute of Marine Science
Contact_Position: Director Comprehensive Coastal Inventory Program
Contact_Address:
Address_Type: 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: 804-694-7179
Contact_Electronic_Mail_Address: marcia@vims.edu
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attributes were compared to original mylar charts for accuracy.
Logical_Consistency_Report:
Polygon topology present.
Completeness_Report:
All charts containing bottom type information were digitized for Virginia.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The positional accuracy of the data is dependent upon the accuracy of the mylar maps and the initial coverages. Field surveys did not use GPS.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Virginia Institute of Marine Science
Publication_Date: 1987
Title:
Baylor Ground and Oyster Bottom Charts
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Gloucester Point, Virginia
Publisher: Virginia Institute of Marine Science
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1978
Ending_Date: 1981
Source_Currentness_Reference:
ground condition
Process_Step:
Process_Description:
The Baylor Ground and oyster bottom mylar charts (BYL) were digitized using ESRI's ArcInfo. Two coverages were created for each chart: one delineating the Baylor Ground (public oyster bottom) outline, and the other containing bottom substrate composition.
Process_Date: 1991
Process_Step:
Process_Description:
Coverages were appended together to form one coverage for Virginia.
Process_Date: 1997
Process_Step:
Process_Description:
The bottom type coverage was edgematched and cleaned. The original mylar charts were consulted to correct data and arc inconsistencies.
Process_Date: 2004

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 4955
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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: botall83
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: AREA
Attribute:
Attribute_Label: PERIMETER
Attribute:
Attribute_Label: BOTALL83_
Attribute:
Attribute_Label: BOTALL83_I
Attribute:
Attribute_Label: BOTTYPE
Attribute_Definition:
numeric code that represents the substrate: 1 = oyster rock, 2 = shell, 3 =  shell and sand,  4 = buried shell, 5 = sand, 6 = sand and mud, 7 = clay, 8 = gravel, 9 = stones, 10 = not surveyed, 11 = uncoded, 12 = occupied, 13 =  barren bottom

Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 4.939

Metadata_Reference_Information:
Metadata_Date: 20110330
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sharon Killeen
Contact_Organization: Virginia Institute of Marine Science
Contact_Position: GIS Programmer/Analyst
Contact_Address:
Address_Type: 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