This data layer was created by the USFWS National Wetlands Inventory, Region 5. Delineations of 2006 eelgrass beds were completed on the eastern Connecticut shoreline to the Rhode Island border. Fisher Island, Plum Island, and the northern shore of Long Island, New York were also included in this work. Spring 2006 True Color aerial photography was taken at a scale of 1:20,000 and used for detemining location and delineation of eelgrass beds. Extensive field work was conducted by the USFWS Region 5 Southern Coastal Zone program in September, October and November, with 290 field sites. The 2006 photography was scanned and geo-rectified using 2004 ADS 1/2 meter true color imagery.
ground condition
Internal feature number. (Source: ESRI)
Feature geometry. (Source: ESRI)
Area of polygon
numeric site #
Approximate location based adjacent areas
Watershed numeric value
signatures of interpreted eelgrass bed
| Value | Definition |
|---|---|
| 1 | Patches, Dark Grn |
| 2 | Patches, Grn/Brn |
| 3 | Patches, Light Grn |
| 4 | Solid, Dark Grn |
| 5 | Solid, Dark Grn/Brn |
| 6 | Solid, Dark Grn/Blk |
| 7 | Solid, Grn/Brn |
| 8 | Solid, Light Grn |
| 9 | Undetermined |
Feature geometry. (Source: ESRI)
Feature geometry. (Source: ESRI)
300 Westgate Center Drive
This dataset was developed for an ongoing eelgrass monitoring of the Long Island Sound. Funding was provided by the EPA, Region 2.
Sames W. Sewall CORPORATE HEADQUARTERS 136 Center Street, P.O. Box 433 Old Town, Maine 04468-0433 207 827 4456 fax: 207 827 3641
The 2006, 1:20000 true color photography was scanned and geo-rectified to ADS 2004 true color 1/2 meter resolution imagery for Connecticut, and 1-ft resoluton true color 2004 New York State imagery. The 2002 eelgrass datalayer was used as a base, and polygonal data was added, subtracted or adjusted to reflect what was identified on the newer imagery. Field work was completed using a USFWS research vessel, and USFWS personnel. Two hundred and ninety sites were checked and documented. This information was converted to a point datalayer and used to adjust the original delineation.
Attribute accuracy based on quality of 1:20000 photography, and the ability to indentify submerged vegetation and the density of beds.
Based on photography, and the abiltiy to identify eelgrass beds and delineate them from 1:20,000 True Color geo-rectified photography
Photography was taken in one single flgiht mission on June 16, 2006
contraints based on limitation of methods of aquiring data through remotely sensed processes.
| Data format: | in format Shapefile, Feature Class (version ArcGIS) |
|---|---|
| Network links: | http://www.ct.gov/deep |
300 Westgate Center Drive