Virginia SAV Habitat - 10 years

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Virginia Institute of Marine Science
Publication_Date: 20190125
Title: Virginia SAV Habitat - 10 years
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
The Chesapeake Bay SAV Coverages are mapped from 1:24,000 black and white aerial photography and digital multispectral imagery with a 25cm GSD to assess water quality in the Bay. Each area of SAV was interpreted from the rectified photography and classified into one of four density classes by the percentage of cover. The SAV beds were entered into an SDE GIS fetaure class using the quality control procedures documented below. The dataset contains all SAV areas that were identified from the areas flown. Some areas that are presumed to contain no SAV were not flown. Some small beds, particularly along narrow tributaries may not have been distinguishable on the aerial photography. Data for 10 years were merged and dissolved to form polygons showing the location where SAV has been mapped.
Purpose:
The annual SAV aerial photographic monitoring program provides a comprehensive and accurate measure of change in SAV relative abundance that has been used to link improving water quality to increases in bay living resources. This dataset shows the location of SAV over a 10 year period.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20080526
Ending_Date: 20171127
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.464109
East_Bounding_Coordinate: -75.265500
North_Bounding_Coordinate: 38.902175
South_Bounding_Coordinate: 36.886505
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: SAV
Theme_Keyword: vegetative surface cover
Theme_Keyword: submerged aquatic vegetation
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: boundaries
Theme_Keyword: environment
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1977, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions (Federal Information Processing Standard 10-3):Washington, D.C., National Institute of Standards and Technology.
Place_Keyword: US
Place:
Place_Keyword_Thesaurus: U.S. Postal State Abbreviations
Place_Keyword: VA
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Chesapeake Bay
Place_Keyword: Chincoteague Bay
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Virginia Institute of Marine Science
Contact_Position: SAV Data Administrator
Contact_Address:
Address_Type: mailing and physical
Address: Rt. 1208, Greate RD
City: Gloucester Point
State_or_Province: VA
Postal_Code: 23062
Country: US
Contact_Voice_Telephone: 804/684-7088
Contact_Electronic_Mail_Address: savadmin@vims.edu
Data_Set_Credit:
SAV Ecology, Monitoring, & Restoration Program, Virginia Institute of Marine Science
Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The density attribute for all beds has been reviewed by an experienced photo-interpreter for correctness and consistency with analysis for prior years.
Logical_Consistency_Report:
The GIS data has been cross-checked against data tables and ground observations.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy is based upon orthorectification of scanned aerial photography using USGS digital orthothophoto quadrangles for horizontal control and USGS 30m DEM data as vertical control. Horizontal RMSE for individual flightlines was held to less than four meters.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Title: Chesapeake Bay SAV Coverage
Online_Linkage:
https://www.vims.edu/research/units/programs/sav/reports/index.php
Type_of_Source_Media: onLine
Source_Citation_Abbreviation: Chesapeake Bay SAV Coverage
Source_Contribution: SAV GIS datasets from 2008 to 2017
Source_Information:
Source_Citation:
Citation_Information:
Title: Virginia Administrative Boundaries
Online_Linkage:
https://vgin.maps.arcgis.com/home/item.html?id=777890ecdb634d18a02eec604db522c6
Type_of_Source_Media: None
Source_Citation_Abbreviation: Virginia Administrative Boundaries
Source_Contribution:
VA_COUNTY is a feature class representing locality (county and city) boundaries in the Commonwealth of Virginia. This dataset was derived from Census TIGER data supplemented with data made available from the cities and counties themselves.
Process_Step:
Process_Description:
Sav shapefiles from the last 10 years available (2008-2017) were unioned using ArcGIS software. SAV beds with density 1 to 4 (sparse to dense) were dissolved to form a shape file that represents SAV habitat over a ten year period.
Process_Date: 20180125
Process_Step:
Process_Description:
The SAV Habitat layer was combined with the VGIN Administrative Boundaries to add countiy location to the dataset.
Process_Date: 20190125
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1884
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: WGS 1984 Web Mercator Auxiliary Sphere
Map_Projection_Parameters:
Other_Projection's_Definition:
PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",3857]]
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001
Planar_Distance_Units: meter
Geodetic_Model:
Horizontal_Datum_Name: D WGS 1984
Ellipsoid_Name: WGS 1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: sav_habitat_current_10years_int_vacnty_wm
Entity_Type_Definition: VIMS
Entity_Type_Definition_Source: VIMS - SAV Program
Attribute:
Attribute_Label: OBJECTID
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: sav_hab
Attribute_Definition: SAV habitat
Attribute_Definition_Source: processor
Attribute:
Attribute_Label: FIPS
Attribute:
Attribute_Label: FIPS2
Attribute:
Attribute_Label: JURIS
Attribute_Definition: Virginia county/city name
Attribute_Definition_Source: processor
Attribute:
Attribute_Label: GIS_Acres
Attribute_Definition: Acres calculated usig the ArcGIS software
Attribute_Definition_Source: processor
Attribute:
Attribute_Label: Shape_Length
Attribute_Definition: Length of feature in internal units.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: Shape_Area
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: years
Attribute_Definition: The range of years used to create this dataset.
Attribute_Definition_Source: processor
Metadata_Reference_Information:
Metadata_Date: 20200911
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Virginia Institute of Marine Science
Contact_Position: SAV Data Administrator
Contact_Address:
Address_Type: unknown
Address: Rt. 1208 Greate Rd.
City: Gloucester Point
State_or_Province: VA
Postal_Code: 32061
Country: USA
Contact_Voice_Telephone: 804/684-7088
Contact_Electronic_Mail_Address: savadmin@vims.edu
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Use_Constraints: None
Generated by mp version 2.9.12 on Fri Sep 11 11:36:14 2020