Casco_Bay_Photo_Identified_Fringing_Marshes

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Wells National Estuarine Research Reserve
Publication_Date: Unpublished Material
Title: Casco_Bay_Photo_Identified_Fringing_Marshes
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage:
\\DEMAND-CURVE\Wells\Casco_Fringe\Admin\Old_Deliverable_Files\GIS\Casco_Bay_Field_Survey_Fringing_Marshes.shp
Description:
Abstract:
This data set contains polygons created by manually identifying and delineating fringing marsh lining the mainland coast of Casco Bay, Maine based on aerial imagery. The primary imagery utilized was the 2003 Topobird 30 cm imagery of Casco Bay, created by DeLorme Publishing, Inc. and loaned to the EPA and Casco Bay Estuary Partnership project 'Mapping and Restoration Inventory of Fringing Marsh Habitat in the Casco Bay Estuary' implemented by the Wells National Estuarine Research Reserve during the spring and summer of 2007.

Each polygon represents what is believed, with varying degrees of confidence, to be fringing marsh lining the mainland coast of Casco Bay as indicated in the 2003 Topobird imagery. Marsh is sometimes differentiated as high or low marsh, but is more often undifferentiated and labeled (see attribute definitions later in metadata) as mixed.

Purpose:
The purpose of this data was to provide, based on the best use of available aerial imagery, the location and extent of fringing marshes along the mainland coast of Casco Bay. Islands (with the exception of those connected to the mainland by bridge or other means) were not included.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200307
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -70.325000
East_Bounding_Coordinate: -69.843672
North_Bounding_Coordinate: 43.897352
South_Bounding_Coordinate: 43.626277
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: wetland
Theme_Keyword: finging marsh
Theme_Keyword: salt marsh
Theme_Keyword: tidal wetland
Place:
Place_Keyword: USA
Place_Keyword: Northeast
Place_Keyword: Maine
Place_Keyword: Gulf of Maine
Place_Keyword: Casco Bay
Access_Constraints: No access constraints.
Use_Constraints:
No use constraints but user must assess the appropriateness of this data for the desired purpose and no claim of accuracy or appropriateness is made.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Wells National Estuarine Research Reserve
Contact_Position: GIS Specialist
Contact_Voice_Telephone: (207) 646-1555 x 120
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 8.3.0.800

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
An effort to estimate the accuracy of identification was performed in 2007 (the year that the project was implemented). This involved boat-based transects of selected areas of the mainland shoreline of Casco Bay during which fringing marshes spotted by observers were marked using handheld GPS units; each marsh was marked by a start and stop point, with intermediate points included where appropriate. Although the boat could sometimes approach within single meters of marshes, it was often not possible (because of depth considerations) to approach closer than 20 or 30 meters, and occasionally not possible to approach closer than 100 or more meters to identified marshes.

Processing the GPS data points created polylines that were then buffered in a GIS system with buffers of varying width. The buffered lines were then geographically joined with the image-delineated marshes to determine the fraction of existing 2007 marshes (from the boat survey) were approximately identified by the image-based process using 2003 imagery.

Results indicated that 60% of the boat-identified marshes were identified from the imagery with a 20 meter buffer. That fraction rose to nearly 70% of the boat-identified marshes identified from the imagery with a 200 meter buffer. Given that marshes are created, destroyed, and changed in extent over time, this is considered a lower bound of the accuracy of identification of marshes in the area.

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal accuracy of polygon vertices was based on visual determination of the bounds of the identified fringing marsh, to the best ability of the operator.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: DeLorme Publishing of Yarmouth, Maine
Title: Topobird 30 cm Aerial Imagery of Maine Coast
Geospatial_Data_Presentation_Form: remote-sensing image
Other_Citation_Details:
Private data with license owned by DeLorme Publishing. Loaned to the Fringing Marsh project by DeLorme Publiching, Inc.
Source_Scale_Denominator: 30 cm ground resolution per pixel
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200307
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: DeLorme Topobird 30 cm Aerial Imagery
Process_Step:
Process_Description:
Imagery was used to manually identify fringing marsh candidates through visual inspection. Additional GIS resources were used in verifying or increasing the confidence in the identification as fringing marsh (as opposed to other features) and included 1) CITIPIX imagery available from Maine GIS website as Ortho_HF. 2) Ortho_1f, also from the Maine GIS website 3) Maine Department of Marine Resources eelgrass aerial imagery, available through the Maine DMR in Boothbay, Maine

Marshes were identified as accurately as possible, and the coverage of the marsh outlined as a polygon.

Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Wells National Estuarine Research Reserve
Contact_Position: GIS Specialist
Contact_Voice_Telephone: (207) 646-1555 x 120
Process_Step:
Process_Description: Metadata imported.
Source_Used_Citation_Abbreviation: C:\DOCUME~1\phayes\LOCALS~1\Temp\xml3.tmp

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: 1159

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 19
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -69.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000064
Ordinate_Resolution: 0.000064
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: Casco_Bay_Photo_Identified_Fringing_Marshes
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: All_Type
Attribute_Definition: Type of marsh, if determinable from imagery
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: H
Enumerated_Domain_Value_Definition:
High Marsh - S.patens or other high marsh vegetation, above average high tide
Enumerated_Domain:
Enumerated_Domain_Value: L
Enumerated_Domain_Value_Definition:
Low marsh - S. alterniflora primarily, inundated daily at high tide
Enumerated_Domain:
Enumerated_Domain_Value: M
Enumerated_Domain_Value_Definition:
Mixed marsh - cannot determine type from imagery, a possible mixture is assumed
Enumerated_Domain:
Enumerated_Domain_Value: I
Enumerated_Domain_Value_Definition:
Invasive - in very few cases invasives, mostly Phragmites, can be discerned from imagery
Attribute:
Attribute_Label: All_Area
Attribute_Definition: Area in square meters as calculated by ArcMap
Attribute:
Attribute_Label: All_Conf
Attribute_Definition: Operator's confidence level when identifying marsh
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: extremely high confidence that marsh is as indicated
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: slightly less confidence that marsh is as indicated
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Less confident - probably some sort of marsh, but...
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
Least confidence - the operator believed that there probably was something there, but it might have been some other type of vegetative patch or algae (as examples)
Attribute:
Attribute_Label: All_Cst
Attribute_Definition:
Environment surrounding the identified marsh making identification difficult - not filled in all cases
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Blank
Enumerated_Domain_Value_Definition:
Either surroundings did not interfere or marsh was identified earlier than this factors addition to the attributes
Enumerated_Domain:
Enumerated_Domain_Value: F
Enumerated_Domain_Value_Definition:
Forested, or other primarily-terrestrial vegetation obscures marsh or provides cover, making identification difficult
Enumerated_Domain:
Enumerated_Domain_Value: M
Enumerated_Domain_Value_Definition:
Silt, mud, rocks, or other substrate on water side - often algae-covered - makes identification difficult
Enumerated_Domain:
Enumerated_Domain_Value: U
Enumerated_Domain_Value_Definition:
Development (usually lawns abutting potential marsh areas) makes identification difficult
Attribute:
Attribute_Label: MA_CZM
Attribute_Definition: Massachusetts Coastal Zone Management marsh assessment score
Attribute_Definition_Source:
Mapping and Restoration Inventory of Fringing Marsh in the Casco Bay Estuary
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 100
Attribute:
Attribute_Label: NEA_Degrad
Attribute_Definition: Degradation score.
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1

Distribution_Information:
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.099

Metadata_Reference_Information:
Metadata_Date: 20080626
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
REQUIRED: The organization responsible for the metadata information.
Contact_Person: REQUIRED: The person responsible for the metadata information.
Contact_Address:
Address_Type:
REQUIRED: The mailing and/or physical address for the organization or individual.
City: REQUIRED: The city of the address.
State_or_Province: REQUIRED: The state or province of the address.
Postal_Code: REQUIRED: The ZIP or other postal code of the address.
Contact_Voice_Telephone:
REQUIRED: The telephone number by which individuals can speak to the organization or individual.
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.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Generated by mp version 2.7.33 on Thu Jun 26 15:12:39 2008