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
Coastal Institute, Box 8
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.
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
Area of polygon
Perimeter of polygon
Internal feature number
Feature identification number
Internal feature number.
User-defined feature number.
No attributes other than length in meters have been incorporated
length - arc length in meters
120 Laurel Street
The National Park Service shall not be held liable for improper incorrect use of the data described and/or contained data and related graphics ("GIF" format files) are documents and are not intended to be used as such. The information contained in these data is dynamic and may change time. The data are not better than the original sources which they were derived. It is the responsibility of user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. The related graphics are intended to aid the data in acquiring relevant data; it is not appropriate to use the related graphics as data. The National Park Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of data. It is strongly recommended that these data are directly acquired from an NPS server and not indirectly through sources which may have changed the data in some way. these data have been processed successfully on a computer system at the National Park Service, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall act of distribution constitute any such warranty. This applies both to individual use of the data and aggregate use with other data.
9 East Alumni Ave, Suite 5