York County Tidal Marsh Inventory 2013

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
Comprehensive Coastal Inventory, Virginia Institute of Marine Science
Publication_Date: 2013
Title: York County Tidal Marsh Inventory 2013
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage:
<http://ccrm.vims.edu/gis_data_maps/shoreline_inventories/index.html>
Description:
Abstract:
The Virginia Institute of Marine Science published the first Tidal marsh Inventories for York County in 1989 using data collected in the 1970's. Using high resolution color infra-red imagery from 2009 and 2011 a new Tidal Marsh Inventory has been developed for 2013. Marsh boundaries were generated using heads-up digitizing techniques at a scale of 1:1,000. Each marsh polygon was classified by morphologic type: fringe, extensive, embayed, or marsh island. Marshes were ground-truthed in the field , in 2010 and 2013, where a community type index was assigned to each marsh based on plant community make-up
Purpose:
To maintain and update an inventory of the distribution of tidal marshes for the Commonwealth of Virginia.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 7/29/2013
Single_Date/Time:
Calendar_Date: 7/31/2013
Single_Date/Time:
Calendar_Date: 6/21/2010
Single_Date/Time:
Calendar_Date: 6/22/2010
Single_Date/Time:
Calendar_Date: 6/23/2010
Single_Date/Time:
Calendar_Date: 6/24/2010
Single_Date/Time:
Calendar_Date: 6/25/2010
Single_Date/Time:
Calendar_Date: 6/28/2010
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.712367
East_Bounding_Coordinate: -76.383619
North_Bounding_Coordinate: 37.373640
South_Bounding_Coordinate: 37.087984
Keywords:
Theme:
Theme_Keyword: Tidal Marsh Inventory
Theme_Keyword: Marsh community type
Place:
Place_Keyword: Virginia
Place_Keyword: York County
Place_Keyword: York River
Place_Keyword: Poquoson River
Place_Keyword: Chesapeake Bay
Place_Keyword: Back Creek
Place_Keyword: Back River
Place_Keyword: Bay Tree Creek
Place_Keyword: Carter Creek
Place_Keyword: Chisman Creek
Place_Keyword: Felgates Creek
Place_Keyword: Goodwin Islands
Place_Keyword: Indian Creek
Place_Keyword: King Creek
Place_Keyword: Queen Creek
Place_Keyword: Skimino Creek
Place_Keyword: Wormley Creek
Access_Constraints: none
Use_Constraints:
The marsh boundaries should not be used for jurisdictional determinations
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
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000
Data_Quality_Information:
Completeness_Report:
All shoreline for York County that has a minimum depth of 2 feet at mean low water was surveyed. Some shorelines are coded remotely if access was restricted due to depth at time of survey. Upper reaches of creeks were often coded remotely.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The positional accuracy of the data is dependent upon the accuracy of the initial shapefiles.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Commonwealth of Virginia, through the Virginia Geographic Information Network (VGIN) of the Virginia Information Technology Agency (VITA)
Title: Virginia Base Mapping Program (VBMP)
Publication_Information:
Publication_Place: Richmond, Virginia
Publisher: Virginia Geographic Information Network (VGIN)
Type_of_Source_Media: base shoreline and imagery
Source_Citation_Abbreviation: VBMP
Source_Contribution: base shoreline and imagery
Process_Step:
Process_Description:
The 2013 TMI (Tidal Marsh Inventory) shapefile was created by visual photo interpretation and heads up digitizing of recent (2009 and 2011) high resolution (6") color-infrared aerial photography at a scale of 1:1000. This scale was picked as a compromise between taking full advantage of the image resolution and time constraints of the project. Marsh information from previous shoreline surveys was used, particularly in identifying narrow fringe marshes. The latest NWI was also used. This delineation was completed prior to the fieldwork and then corrected as noted in the field.
Process_Date: 2013
Process_Step:
Process_Description:
Wetlands Advisory Group (WAG) scientists with experience identifying tidal wetland plant species are responsible for TMI field data collection. During boat surveys, observations of tidal marshes visible along the shoreline from a boat are made using binoculars. The WAG scientist compares observed tidal marshes with the digitized polygons on the aerial photographs.
Field data sheets are used to record all of the mapped marsh polygons that are ground truthed as tidal marshes. New marshes that are not delineated as numbered polygons are drawn onto the aerial photos using legible ink for future digitizing. Each new marsh is assigned a unique new marsh ID number using pre-established sequences for each scientist. Previously digitized polygons that are determined through observation to be "Not Marsh" are recorded for future deletion with notes to document what the actual condition is.
All observed tidal wetland plant species within each marsh polygon are recorded on the field data sheets. For surveys conducted in 2010, percent cover was recorded for each plant species observed. For surveys conducted after 2010, plant species present were placed in one of three cover categories: Dominant (>50%), Present (1-49%), or Trace (<1%). Marsh community type, based on relative species dominance, was also recorded. Data from the 2010 survey was converted to the 2013 format for merging purposes, but the original percent cover data is available on request.
Field data is then entered into a project-specific attribute table for easy assimilation into a geo-referenced database. Quality assurance checks after data entry include looking for and fixing duplicate polygon numbers, deleting all Not Marsh polygons, correcting inconsistent community codes, and verifying that the field surveyed marsh polygons in the final maps have the correct, corresponding field data.
Process_Date: 2013
Process_Step:
Process_Description:
Maps that have been verified in the field are checked in the lab for any discrepancies. Any changes to existing marsh boundaries or the addition of new marshes are made this stage. Marsh polygons are also coded for field verification
Process_Date: 2013
Process_Step:
Process_Description:
Community type, presence of phragmites and comments are extracted from the marsh excel spreadsheet and joined (ArcMap command Join Field) to the tidal marsh shapefile using the marsh id as the common attribute.
Process_Date: 2013
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sharon Killeen
Contact_Organization:
Comprehensive Coastal Inventory Program, Virginia Institute of Marine Science
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: 804-684-7534
Contact_Facsimile_Telephone: 804-684-7179
Contact_Electronic_Mail_Address: sharon@vims.edu
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
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: YorkCo_TMI_2013
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_Definition: size of marsh in acres
Attribute:
Attribute_Label: TMI_ID
Attribute:
Attribute_Label: marshclass
Attribute_Definition:
Geomorphic classification of marsh polygons based on size, shape and location in the landscape (Fringe >15 feet, Fringe <15 feet, Embayed, Extensive, and Marsh Island)
Attribute:
Attribute_Label: FIELD
Attribute_Definition: field verified
Attribute:
Attribute_Label: Final_ID
Attribute:
Attribute_Label: CmtyType
Attribute_Definition:
Plant community type: I = Saltmarsh Cordgrass/low marsh,II = Saltmeadow/high marsh, III = Black Needlerush, IV = Saltbush, V = Big Cordgrass, VI = Cattail, VII = Arrow Arum, VIII = Reedgrass, IX = Yellow Pond Lily, X = Saltwort, XI = Freshwater mix, XII = Brackish mix
Attribute:
Attribute_Label: Reedgrass
Attribute:
Attribute_Label: PctPhrag
Attribute_Definition: % of Phragmites australis present
Attribute:
Attribute_Label: FieldDate
Attribute_Definition: Date of field verification
Attribute:
Attribute_Label: CollectedB
Attribute_Definition: data collected by
Attribute:
Attribute_Label: Acres
Attribute_Definition: size in acreage
Attribute:
Attribute_Label: Code
Attribute:
Attribute_Label: CommunType
Attribute:
Attribute_Label: Dominant_P
Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 18.259
Metadata_Reference_Information:
Metadata_Date: 20131205
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sharon Killeen
Contact_Organization:
Comprehensive Coastal Inventory Program, Virginia Institute of Marine Science
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: 804-684-7534.
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
Generated by mp version 2.9.6 on Thu Dec 05 10:13:20 2013