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Great Bay Estuary Eelgrass, 2019

Great Bay Estuary Eelgrass, 2019

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Seth Barker, Independent Contractor
Publication_Date: 20200427
Title: Great Bay Estuary Eelgrass, 2019
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage:
<URL:http://www.granit.unh.edu/data/search?dset=eelgrass/eelgrass2019>
Description:
Abstract:
The dataset shows the locations where eelgrass was observed in the Great Bay Estuary based on photointerpretation of orthophotography collected on August 2, 2019. The study area includes the following waterbodies: Great Bay, the mouth of the Squamscott River, the tidal portion of the Lamprey River, the tidal portion of the Oyster River, the tidal portion of the Bellamy River, the Piscataqua River and Portsmouth Harbor and its associated creeks. Vertical aerial photography was collected as digital 4-band imagery with a nominal 1 foot resolution using an Zeiss DMC IIe 230 Mapping Camera. Environmental conditions included a low-sun angle, low spring tide, low cloud cover, calm winds, no preceding rain events, and low turbidity in the water column. The eelgrass habitat mapped from the aerial imagery was verified using the ground truthing data from preselected locations and ad hoc locations chosen during the course of the field work. Ground truthing was done from a small boat during the same season as the photographs were taken. Ground truth observations were made on all tides using a drop camera with video recording capabilities and at low tide when visual observations were recorded. Positions were determined using high accuracy Trimble GeoXT GPS unit.
Purpose:
The dataset was developed to monitor the distribution of eelgrass within the Great Bay Estuary over time. With the exception of 2018, surveys have been completed yearly since 1986 to track trends over time.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20190802
Currentness_Reference: Ground Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Annually
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -70.911297
East_Bounding_Coordinate: -70.677157
North_Bounding_Coordinate: 43.153869
South_Bounding_Coordinate: 43.049923
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: biota
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Eelgrass
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Estuary
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Estuarine
Place:
Place_Keyword_Thesaurus: ISO 19115 Topic Category
Place_Keyword: oceans
Place_Keyword: Northeast
Place_Keyword: New England
Place_Keyword: New Hampshire
Place_Keyword: Great Bay
Place_Keyword: Little Harbor
Place_Keyword: Piscataqua River
Place_Keyword: Lamprey River
Place_Keyword: Oyster River
Place_Keyword: Bellamy River
Place_Keyword: Portsmouth Harbor
Place_Keyword: Squamscott River
Place_Keyword: New Castle
Place_Keyword: Rye
Place_Keyword: Portsmouth
Place_Keyword: Newington
Place_Keyword: Greenland
Place_Keyword: Stratham
Place_Keyword: Newfields
Place_Keyword: Newmarket
Place_Keyword: Durham
Place_Keyword: Dover
Place_Keyword: Madbury
Place_Keyword: Eliot
Place_Keyword: Kittery
Place_Keyword: Maine
Access_Constraints: None
Use_Constraints:
User is required to read metadata completely before using the data. The information provided in this coverage was developed by an independent contractor and used by the NH Department of Environmental Services (NHDES). Development of these databases is an ongoing project; they may not contain all existing and potential sites, stations, or threats. The NHDES is not responsible for the use or interpretation of this information, or for any inaccuracies in the site names or locations. All information is subject to verification. These data are to be used for planning purposes only; distribution is discouraged.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kalle Matso
Contact_Organization:
Piscataqua Region Estuaries Partnership, University of New Hampshire
Contact_Position: Science Program Manager
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Nesmith Hall, 131 Main St.
City: Durham
State_or_Province: New Hampshire
Postal_Code: 03824
Contact_Voice_Telephone: 603-781-6591
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcGIS 10.0.4.4000

Data_Quality_Information:
Logical_Consistency_Report:
Note that yearly variations in collection methods exist. Following is a summary of methods that have been used.

The eelgrass habitat mapped from the aerial imagery is verified using the ground truthing data by placing the ground-truthing locations onto the digital image using GIS software. Ground-truthing is done from a small boat during the same season as the photographs are taken. Ground-truth observations are made at low tide or at other tide stages using a drop camera. Positions are determined using GPS. Gaps, overlapping polygon areas and duplicate polygons are identified and removed.

Completeness_Report: The dataset is complete. There are no known omissions.
Lineage:
Process_Step:
Process_Description:
The final photomosaics were received in December, 2019, from Cornerstone Mapping. These were added to a GIS along with field information and other data layers to aid in photointerpretation. Eelgrass beds were first outlined and screen digitized using the GIS software packages, QGIS, and saved to an ESRI shape file. Digitizing was generally done at a screen scale of 1:1000 or greater. The minimum mapping unit for the delineation of eelgrass features was generally 100 square meters. However, smaller features were included in the dataset if they could be clearly discerned as pure eelgrass beds.The projection used was New Hampshire State Plane, NAD83, and the units were feet.
Process_Date: 201912
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Kalle Matso
Contact_Organization:
Piscataqua Region Estuaries Partnership, University of New Hampshire
Contact_Position: Science Program Manager
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Nesmith Hall, 131 Main St.
City: Durham
State_or_Province: New Hampshire
Postal_Code: 03824
Contact_Voice_Telephone: 603-781-6591

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: 136

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: 2800
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999967
Longitude_of_Central_Meridian: -71.666667
Latitude_of_Projection_Origin: 42.500000
False_Easting: 984250.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.002048
Ordinate_Resolution: 0.002048
Planar_Distance_Units: survey feet
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: eelgrass2019
Entity_Type_Definition: Each polygon of eelgrass habitat is assigned an id.
Entity_Type_Definition_Source: Seth Barker, Consultant
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: HECTARES
Attribute_Definition: Eelgrass area in hectares.
Attribute_Definition_Source: Seth Barker, Consultant
Attribute_Domain_Values:
Unrepresentable_Domain: Calculated value.
Attribute:
Attribute_Label: ACRES
Attribute_Definition: Acreage of the eelgrass area.
Attribute_Definition_Source: Seth Barker, Consultant
Attribute_Domain_Values:
Unrepresentable_Domain: Calculated value.
Attribute:
Attribute_Label: YEAR
Attribute_Definition: The year that the data was collected.
Attribute_Definition_Source: Seth Barker, Consultant
Attribute_Domain_Values:
Unrepresentable_Domain: Calculated value.
Attribute:
Attribute_Label: LABEL
Attribute_Definition: Assessment Zone
Attribute_Definition_Source: Seth Barker, Consultant
Attribute_Domain_Values:
Unrepresentable_Domain: None
Attribute:
Attribute_Label: Type
Attribute_Definition: SAV type
Attribute_Definition_Source: Seth Barker, Consultant
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Eelgrass
Enumerated_Domain_Value_Definition_Source: None
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Eelgrass and Widgeon grass
Enumerated_Domain_Value_Definition_Source: None
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Widgeon grass
Enumerated_Domain_Value_Definition_Source: None
Attribute:
Attribute_Label: Name
Attribute_Definition: SAV Name
Attribute_Definition_Source: Seth Barker, Consultant
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 'Eelgrass
Enumerated_Domain_Value_Definition: Eelgrass
Enumerated_Domain_Value_Definition_Source: None
Enumerated_Domain:
Enumerated_Domain_Value: Eelgrass and Widgeon Grass
Enumerated_Domain_Value_Definition: Eelgrass and Widgeon Grass
Enumerated_Domain_Value_Definition_Source: None
Enumerated_Domain:
Enumerated_Domain_Value: Widgeon Grass
Enumerated_Domain_Value_Definition: Widgeon Grass
Enumerated_Domain_Value_Definition_Source: None

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Earth Systems Research Center, University of New Hampshire
Contact_Person: GRANIT Database Manager
Contact_Position: GRANIT Database Manager
Contact_Address:
Address_Type: mailing and physical address
Address: Morse Hall, University of New Hampshire
City: Durham
State_or_Province: NH
Postal_Code: 03824
Contact_Voice_Telephone: 603-862-1792
Contact_Facsimile_Telephone: 603-862-0188
Contact_Electronic_Mail_Address: granit@unh.edu
Hours_of_Service: 8:30AM-5PM. EST
Resource_Description: Downloadable Data
Distribution_Liability:
Digital data in NH GRANIT represent the efforts of the contributing agencies to record information from the cited source materials. Earth Systems Research Center, under contract to the NH Office of Strategic initiatives, and in consultation with cooperating agencies, maintains a continuing program to identify and correct errors in these data. OSI, ESRC, and the cooperating agencies make no claim as to the validity or reliability or to any implied uses of these data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ESRI shapefile
Transfer_Size: 0.3057 MBs
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: URL:<http://www.granit.sr.unh.edu>
Fees:
No charge when downloaded from the Internet. Cost of reproduction for provision on CD/ROM of other media.
Ordering_Instructions:
Email GRANIT (granit@unh.edu) or order from web site (www.granit.unh.edu).
Turnaround: Two weeks
Technical_Prerequisites: None

Metadata_Reference_Information:
Metadata_Date: 20200424
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Piscataqua Region Estuaries Partnership, University of New Hamps..hire
Contact_Person: Kalle Matso
Contact_Position: Science Program Manager
Contact_Address:
Address_Type: mailing and physical address
Address: Newmith Hall, 131 Main St.
City: Durham
State_or_Province: New Hampshire
Postal_Code: 03824
Contact_Voice_Telephone: 603-891-6591
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-2001
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.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.8.13 on Fri Apr 24 16:52:16 2020
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