These data represent 8 submerged aquatic vegetation and salt marsh habitat classes in Great South Bay along the Wilderness Area of Fire Island National Seashore. Estuarine habitat types were mapped in stereo from 17 true-color aerial photographic transparencies at a scale of 1:7,200. The photography was taken on 9 November 1992 by Keystone Aerial Surveys, Philadelphia, PA (flight KAS 92-115) for Fire Island National Seashore. During 1995 and 1996, habitat features were interpreted, digitized, and georegistered in coordinates of Universal Transverse Mercator, Zone 18, North American Datum 1983. These spatial data are in Arc/Info Geographic Information System Coverage format.
This map was produced by investigators at the University of Rhode Island through a grant from the U.S. Department of Interior's National Biological Service Coastal Research Center and the National Park Service North Atlantic Regional Office. The title of the project is, "Field Evaluation of Fire Island National Seashore (NY) Estuarine Resources." The purpose of this study is to acquire baseline information on ecological phenomena in estuarine habitats. At a later time, changes can be measured, analyzed, and used to develop long-term management strategies
ground condition
None
Coastal Institute, Box 8
n/a
topologically clean
Ocean Ridge/Watch Hill eastward to Smith Point County Park approx. 1.2 km east of the Fire Island National Seashore Ranger Station. Delineated area extends north from Fire Island into the Great South Bay from 300 to 800 m.
Photography was georegistered using control points collected with a C/A code GPS unit (Trimble GeoExplorer I). The resulting control points yield errors ranging from 2 to 5 m after differential processing (with URI GPS Base Station) and averaging.
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GPS data collection, differential correction, coordinate projection, GIS integration
Aerial photointerpretation; GPS data collection, differential correction, coordinate projection, GIS integration
Estuarine habitat types were mapped in stereo from 17 true-color aerial photographic transparencies at a scale of 1:7,200. The photography was taken on 9 November 1992 by Keystone Aerial Surveys, Philadelphia, PA (flight KAS 92-115) for Fire Island National Seashore. Habitat types were delineated, classified, and digitized directly from the transparencies. Habitat classifications were ground-truthed in-situ. Eelgrass was mapped in accordance to specifications described in a manuscript entitled, "1993 Distribution of Submerged Aquatic Vegetation in the Chesapeake Bay" by the Virginia Institute of Marine Science." Georegistration was performed using Global Positioning System-derived coordinates for well-defined features on the photography. Data exist in UTM coordinates, zone 18, NAD83.
Coastal Institute, Box 8
Dataset copied.
Area of polygon
Software generated
Perimeter of polygon
Software generated
Internal feature number
Software generated
Feature identification number
Software generated
Internal feature number.
ESRI
User-defined feature number.
ESRI
No attributes other than length in meters have been incorporated
length - arc length in meters
120 Laurel Street
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