20220331 15160800 1.0 FGDC CSDGM Metadata TRUE 150000000 5000 FGDC The presence or absence of eelgrass and widgeon grass was delineated for coastal Rhode Island using tidally-coordinated orthophotography, GPS, and underwater video recordings. These 2021 data utilize consistent mapping methodology with previous mapping efforts in 2016, 2012, and 2006. Therefore , these data may support SAV dynamics (see accompanying report by Bradley et.al), conservation, marine spatial planning, coastal resource management. RI Submerged Aquatic Vegetation 2021 2022-04-04T00:00:00 2022-04-04T00:00:00 Michael Bradley University of Rhode Island - Environmental Data center Research Associate 1 Greenhouse Road, Coastal Institute Kingston Kingston RI 02881 michael_bradley@uri.edu 401-874-5054 eelgrass zostera marina widgeon grass Rhode Island submerged aquatic vegetation RI CRMC, URI-EDC, Narragansett Bay National Estuarine Research Reserve <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Zostera marina and Ruppia maritima (submerged aquatic vegetation) beds were delineated (polygons) using ortho-imagery collected in June, 2021. In order to maximize the identification of photo-signatures of SAV, the imagery was acquired using specifications from the NOAA Coastal Change Analysis Program including low tide, slight winds, low sun angle, full sun, and minimal humidity or haze. During the ortho creation process, solar glint was minimized by selecting flight lines with minimal glint. The delineation process was supplemented by geo-referenced underwater video recordings. To identify field survey locations, GPS enabled tablets were loaded with draft versions of the 2021 ortho-imagery and preliminary SAV delineations. After processing of field data, 999 acres of SAV were identified and delineated in coastal Rhode Island waters. To test the accuracy of the delineations, a user's and producer's matrix was developed (Story and Congalton, 1986). The overall user's accuracy for the 2021 SAV surveys was 83%. </SPAN></P></DIV></DIV></DIV> Coastal Rhode Island including Block Island and Little Narragansett Bay 2022-04-04T00:00:00 2022-04-04T00:00:00 -72.026 -70.973 41.133 41.962 20220405 Michael Bradley University of Rhode Island - Environmental Data center Research Associate 1 Greenhouse Road, Coastal Institute Kingston Kingston RI 02881 michael_bradley@uri.edu 401-874-5054 Michael Bradley SAV beds were heads up digitized using ortho-photography as a base map. The ortho-photography was acquired using two sorties (flights) in June, 2021. Draft imagery was provided in August 2021 for preliminary SAV delineations. Draft imagery and the preliminary SAV delineations were loaded onto a GPS-enabled tablet and taken into the field to identify locations to collect underwater video recordings. To insure the mapping process was done during the same year as the imagery, field surveys were done over 13 days from August to October, 2021. Underwater video recording were collected with a GPS water mark (+/- 3 m accuracy) in order to create a GIS database of underwater video tracks. Underwater video track lines were created by pausing and advancing the video every 30 seconds and recording the location and presence or absence of SAV. At other locations such the Narrow River and Ninigret Pond, only GPS and boat observations (using an aqua scope) were used in the field. In total, 1238 underwater video locations and 94 boat observations (1332 total) were used to finalize the SAV delineations. Final interpretations and delineations were done using the final delivery of the ortho photography. 2022-04-04T00:00:00 Michael Bradley URI-EDC Kingston RI 02852 401-874-5054 A visual check of all g_truth_yr = 0 results in all g_truth_me = N/A. Thus the fields have conceptual consistency. A user's and producers accuracy matrix was developed by randomly selecting 10% of the underwater video points (124) and withholding them from the final delineation and interpretation. Once the final mapping was complete, these points were used to derive the accuracy matix by comparing them against the final delineations. An overall user's accuracy of 83% was the result. habitat classification of the habitat photo interpretation habitat eelgrass = Zostera marina widgeon grass = Ruppia maritima photo interpretation text 25 habitat photointerpretation g_truth_me Ground Truth Method field g_truth_me N/A = not available GPS and underwater video = underwater video track or location with GPS water mark or information Boat observation = observation of SAV but no GPS information; location is derived from the photography. GPS and boat observation = no underwater video information. SAV was observed from boat using aqua scope or looking over the side. 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