DEP Eelgrass

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: MA DEP Wetlands Conservancy Program
Publication_Date: February 2006
Title:
DEP Eelgrass
Edition: 2
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: Server=dep-fp-bos-006; Service=5151; User=gisdata; Version=SDE.DEFAULT
Description:
Abstract:
Seagrass beds are critical wetlands components of shallow coastal ecosystems throughout the state. Seagrass beds provide food and cover for a great variety of commercially and recreationally important fauna and their prey. The leaf canopy of the seagrass bed calms the water, filters suspended matter and together with extensive roots and rhizomes, stabilizes sediment.

Eelgrass and other seagrasses are often referred to as "Submerged Aquatic Vegetation" or SAV. This distinguishes them from algae, which are not classified as "plants" by biologists (rather they are often placed in the kingdom protista), and distinguishes them from the "emergent" saltwater plants found in salt marshes. In addition to the term SAV, some coastal managers use the term SRV or submerged rooted vegetation. This term probably arose to avoid confusion because non-scientists considered both seagrasses and algae as "plants" or "vegetation," and did not realize the term SAV excluded algae.  (refer to http://www.buzzardsbay.org/eelgrass.htm)

The DEP Eelgrass layer, produced from data collected in 2001, is the second statewide mapping of the eelgrass resources along the coast.  The data were compiled from similar methodologies as the earlier 1995 dataset. A similar third iteration of this statewide mapping is planned for the 2006-07 seasons.

Eelgrass, Zostera marina, is the most common seagrass present on the Massachusetts coastline.  The other species found in embayments of the Massachusetts coast is Ruppia maritima, widgeon grass,  is present in areas of less salinity along the Cape Cod and Buzzards Bay coast.

The layer is named EELGRASS_POLY. With the February 2006 update, which added the 2001 data, the EGRASVPT_PT layer of field verified points was discontinued.
Purpose:
The purpose of mapping the distribution of eelsgrass (Submerged Aquatic Vegetation - SAV) is to determine areas where the Zostera marina resource was decreasing in area and  cover.  The methods used for the 2001 were similar to those used in the earlier 1995.  One exception to this specification was the change in the delineatation of  apparent areas of no Zostera within polygons of the resource (i.e. holes).  This change in mapping convention was derived from a better understanding of the scientific literature of the dynamics of Zostera beds which describes subtle "infra" movement  within beds in response to day-to-day wave action, currents and sand migration, and storm events.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: February 2006
Currentness_Reference:
publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.0
East_Bounding_Coordinate: -69.5
North_Bounding_Coordinate: 42.5
South_Bounding_Coordinate: 40.5.
Keywords:
Theme:
Theme_Keyword_Thesaurus: eelgrass seagrass
Theme_Keyword: eelgrass submerged aquatic vegetation rupia seagrass
Place:
Place_Keyword: massachusetts
Access_Constraints: No restrictions to access
Use_Constraints:
Use for other than display purposes requjires the consent of the Mass DEP Wetlands Conservancy Program Manager
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Charles Costello
Contact_Organization: MA DEP - Wetlands Conservancy Program
Contact_Position: Director
Contact_Address:
Address_Type: mailing and physical address
Address:
1 Winter St
City: Boston
State_or_Province: MA
Postal_Code: 01915
Country: USA
Contact_Voice_Telephone: 617-292-5907
Contact_Facsimile_Telephone: 617-556-1049
Contact_Electronic_Mail_Address: charles.costello@state.ma.us
Hours_of_Service: 9am-5pm
Data_Set_Credit:
Mass Dept of Environmental Protection - Wetlands Conservancy Program
Security_Information:
Security_Classification_System: none
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722
Cross_Reference:
Citation_Information:
Title:
EELGRASS_POLY
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Edge of polygons accurate to +- 10 meters
Completeness_Report:
Complete to date of delineation
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
edge of polygon accurate to +- 10 meters
Lineage:
Source_Information:
Source_Scale_Denominator: 1:12000
Type_of_Source_Media: Aerial photos
Source_Contribution:
flown low tide no clouds
Source_Information:
Type_of_Source_Media: field verification with gps and underwater camera
Source_Contribution:
field verification of interpreted areas
Process_Step:
Process_Description:
Dataset copied.
Source_Used_Citation_Abbreviation:
Server=sun420.env.state.ma.us; Service=esri_sde; User=massgis; Version=SDE.DEFAULT
Process_Step:
Process_Description:
Dataset copied.
Source_Used_Citation_Abbreviation:
\\Milton\F\CACO\MASSGIS_0707\EELGRASS_POLY
Cloud_Cover: none
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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: 9318
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 2001
Lambert_Conformal_Conic:
Standard_Parallel: 41.716667
Standard_Parallel: 42.683333
Longitude_of_Central_Meridian: -71.500000
Latitude_of_Projection_Origin: 41.000000
False_Easting: 200000.000000
False_Northing: 750000.000000
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
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: GISDATA.EELGRASS_POLY
Attribute:
Attribute_Label: SHAPE
Attribute_Definition:
Feature geometry.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
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: HABITAT95
Attribute_Definition:
SAV type observed in 1995
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: eelgrass
Enumerated_Domain_Value_Definition:
Zostera marina, Eelgrass
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: 10 meters
Attribute:
Attribute_Label: HABITAT01
Attribute_Definition:
SAV type observed in 2001
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: eelgrass
Enumerated_Domain_Value_Definition:
Zostera marina, Eelgrass
Enumerated_Domain:
Enumerated_Domain_Value: rupia
Enumerated_Domain_Value_Definition:
Ruppia maritima, widgeon grass
Enumerated_Domain:
Enumerated_Domain_Value: Freshwater sp
Enumerated_Domain_Value_Definition:
Freshwater species
Attribute_Value_Accuracy_Information:
Attribute_Value_Accuracy: 10 meters
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: CODE
Attribute_Definition:
coded value for legend
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 95 Only
Enumerated_Domain_Value_Definition:
SAV observed in 1995 only
Enumerated_Domain:
Enumerated_Domain_Value: 01 Only
Enumerated_Domain_Value_Definition:
SAV observed in 2001 only
Enumerated_Domain:
Enumerated_Domain_Value: 95 and 01
Enumerated_Domain_Value_Definition:
SAV observed in both 1995 and 2001
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: SHAPE_LEN
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Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 5.784
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Metadata_Reference_Information:
Metadata_Date: 20060216
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Massachusetts Department of Environmental Protection
Contact_Person: Robert Hames
Contact_Address:
Address_Type: mailing and physical address
Address:
One Winter Street
City: Boston
State_or_Province: MA
Postal_Code: 02108
Contact_Voice_Telephone: 617-556-1115
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: http://www.mass.gov/mgis/eelgrass.htm
Profile_Name: MassGIS Web Documentation
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
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