Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Grant McKown, Jackson Estuarine Laboratory, University of New Hampshire
        Publication_Date: 20251118
        Publication_Time: 010000
        Title: Intertidal Rockweed Distribution
        Geospatial_Data_Presentation_Form: vector digital data
    Description:
      Abstract: The distribution of rockweed macroalgae was determined through a combination of remote sensing and field work in the Summer – Fall 2024. Preliminary rockweed distribution was calculated in Google Earth Engine with 2015 Leaf-off aerial imagery of New Hampshire (4-band) and National Agriculture Imagery Program (2012 – 2016, 4 – band). Manual thresholds of the non-difference brown algae index, non-difference water index, ratio of Red – Blue bands, and elevation (NAVD88 m) were used to differentiate rockweed from open water, bare mud, salt marsh, and overhanging tree canopy in the intertidal zone. Field inspections of the preliminary classification were conducted by boat along all tidal rivers in the estuary to remove erroneous classification of salt marsh and overhang tree canopy. See McKown et al., 2025 for detailed project description.
      Purpose: The dataset is intended to describe a conservative distribution of rockweed macroalgae (Fucus and Ascophyllum species) in the Great Bay Estuary, respective tidal rivers, and the Piscataqua River around Portsmouth, New Hampshire.
    Status:
      Maintenance_and_Update_Frequency: None planned
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -70.945895
        East_Bounding_Coordinate: -70.682039
        North_Bounding_Coordinate: 43.177657
        South_Bounding_Coordinate: 43.022955
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: None
        Theme_Keyword: Rockweed
        Theme_Keyword: Macroalgae
        Theme_Keyword: Intertidal
        Theme_Keyword: Eastern Oyster
        Theme_Keyword: Mussel
        Theme_Keyword: Great Bay Estuary
        Theme_Keyword: Piscataqua River
        Theme_Keyword: New Hampshire
        Theme_Keyword: Maine
      Theme:
        Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
        Theme_Keyword: biota
    Access_Constraints: None
    Use_Constraints: The data is intended for scientific research, policy decision making, and educational purposes. Proper citation is required for any use. Not for legal use.
    Data_Set_Credit: James McKown, Coastal Habitat Restoration Team, Jackson Estuarine Laboratory, University of New Hampshire
    Native_Data_Set_Environment: Esri ArcGIS 13.0.2.36056
  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: 3485
  Entity_and_Attribute_Information:
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: Intertidal_Rockweed_Distribution_GreatBay_Feb2025
        Entity_Type_Definition: Intertidal Rockweed Distribution
      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: Rockweed_ID
        Attribute_Definition: Rockweed identifier.
        Attribute_Definition_Source: Jackson Lab
      Attribute:
        Attribute_Label: Region
        Attribute_Definition: Region of Great Bay.
        Attribute_Definition_Source: Jackson Lab
      Attribute:
        Attribute_Label: Longitude
        Attribute_Definition: Longitude location.
        Attribute_Definition_Source: Jackson Lab
      Attribute:
        Attribute_Label: Latitude
        Attribute_Definition: Latitude location.
        Attribute_Definition_Source: Esri
      Attribute:
        Attribute_Label: Area_acre
        Attribute_Definition: Area in acres.
        Attribute_Definition_Source: Jackson Lab
      Attribute:
        Attribute_Label: Area_m2
        Attribute_Definition: Area in square meters.
        Attribute_Definition_Source: Jackson Lab
      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.
  Metadata_Reference_Information:
    Metadata_Date: 20251118
    Metadata_Contact:
      Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: NH GRANIT
        Contact_Position: Database Manager
        Contact_Address:
          Address_Type: mailing and physical
          City: Durham
          State_or_Province: NH
          Postal_Code: 03824
        Contact_Voice_Telephone: 603-862-1214
        Contact_Electronic_Mail_Address: granit@unh.edu
    Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
    Metadata_Standard_Version: FGDC-STD-001-1998
    Metadata_Time_Convention: local time