This data set contains shape files created from field measurements using a handheld GPS (Garmin GPS 76). A random set of fringing marshes along the mainland coast of Casco Bay, Maine was surveyed by foot during the summer of 2007. For each marsh, the perimeter of the whole fringing marsh (including high marsh, low marsh, and any invasive patches) was measured and stored as a series of GPS waypoints. If appropriate, the high marsh was similarly measured. If appropriate, major patches of invasive species were measured. At a subset of the marshes, a surveyor's level was used to measure the perimeter of the marsh that would exist were the sea level to rise by +40 cm (each point on the existing marsh perimeter was duplicated by a point perpendicular to the waterline that was +40 cm higher).
Purpose:
The purpose of this effort was to provide a field-surveyed selection of fringing marshes in Casco Bay from which descriptive statistics - such as average area, length, perimeter, upper and lower marsh areas, and so forth - might be derived for use with image-delineated marshes found for the Casco Bay Fringing Marsh Mapping and Assessment project sponsored by the EPA and Casco Bay Estuary Partnership during the summer of 2007.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20070716
Ending_Date: 20070830
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -70.259442
East_Bounding_Coordinate: -69.850542
North_Bounding_Coordinate: 43.883894
South_Bounding_Coordinate: 43.699370
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:
Lineage:
Process_Step:
Process_Description:
GIS waypoints were manually interpreted to form polygons for each of the described measurements of each marsh, where appropriate:
1) Perimeter of total marsh
2) Perimeter of high marsh
3) Perimeter of marsh at sea level rise of +40 cm
4) Perimeter of major invasive patches