Service Description: The presence or absence of eelgrass and widgeon grass was delineated for coastal Rhode Island using tidally-coordinated orthophotography, GPS, and underwater video. these data may support SAV dynamics (see accompanying report by Bradley et.al), conservation, marine spatial planning, coastal resource management.
Service ItemId: 264caa1d2ad947e29555896d408acfec
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Description: Polygons of submerged aquatic vegetation (SAV) were delineated from photo signatures identified on 4 band orthophotography. Ground truthing was done after initial delineations where completed. Ground truthing was done by boat using underwater video equipment and GPS. Final delineation and GIS database development was done using ground truth information. Over 235 delineations of eelgrass and widgeon grass were made totaling 1386 acres.
These data were developed by the RI Eelgrass Mapping Taskforce:
Michael Bradley - URI EDC;
Rob Hudson - Rhode Island Save the Bay;
Andrew MacLachlan - USFWS;
Marci Cole - Rhode Island Save the Bay;
Kenneth Raposa - NOAA NBERR;
Spatial Reference: 103144 (6568)
Initial Extent:
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Spatial Reference: 103144 (6568)
Full Extent:
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Spatial Reference: 103144 (6568)
Units: esriFeet
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