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OAS accession Detail for 0209109, meta_version: 5. Current meta_version is: 10
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| accessions_id: | 0209109 | archive |
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| Title: | NCCOS mapping: seafloor mapping products for Kachemak Bay, Cook Inlet, AK, from 2005-07-06 to 2017-07-19 (NCEI Accession 0209109) |
| Abstract: | This dataset contains seafloor mapping data from hydrographic multibeam sonar surveys, a thematic benthic habitat map created from these multibeam sonar surveys, and georeferenced benthic photographs and video clips, all collected in and around Kachemak Bay, Alaska. The multibeam data set contains the bathymetric data collected by the NOAA Ships Fairweather and Rainier in the summers of 2008 and 2009. Underwater videos for ground validation were acquired during the field missions of July 2016 and July 2017 aboard the R/V Edgecumbe. An additional seagrass map, generated by manual interpretation of air photos captured in 2005, is also included, as are the air photos. |
| Date received: | 20200403 |
| Start date: | 20050706 |
| End date: | 20170719 |
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| West boundary: | -151.971995 |
| East boundary: | -151.01898 |
| North boundary: | 59.758568 |
| South boundary: | 59.328606 |
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| Submitting institution: | US DOC; NOAA; NOS; National Centers for Coastal Ocean Science |
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| Supplementary information: | Methods: Multibeam sonar data (seabed elevation) and acoustic imagery data (backscatter) were collected using multibeam echosounders (MBES) on the NOAA Ships Fairweather and Rainier from cruises during the years 2008 and 2009. The multibeam datasets contain both bathymetric and backscatter data for the Kachemak Bay area, from Bear Cove in the Northeast to an area outside of the Homer Spit, roughly bounded by Anchor Point to the north and Port Graham to the Southwest. Thirteen survey areas were collected: H11933, H11934, H11935 and H11938 were collected in 2008; H12084, H12085, H12086, H12087, H12088, H12089, H12090, H12114, H12146 were collected in 2009. The bathymetry data were used to develop eight complexity surfaces (bathymetry mean, bathymetry stdev, curvature, curvature plan, curvature profile, rugosity, slope, and slope of slope) that were used in a Principle Component Analysis (PCA). The PCA was used to generate the benthic habitat map as described in Costa and Battista, 2013. NCCOS collected underwater videos during research cruises aboard the R/V Edgecumbe. These were edited to focus on benthic habitat, and analyzed for groundtruth validation of habitat type (unconsolidated sediment, sand, rock, etc., as described in Federal Geographic Data Committee, 2012). The videos were collected with two video cameras mounted in a stainless steel frame. One was a lower resolution (720p) camera (Sartek Industries Inc.) that was tethered to the surface where the video was recorded to a DVR. The other was a higher resolution (1080p) GoPro. The lower resolution camera was down looking – perpendicular to the bottom. Video from the low resolution camera could be viewed at the surface and was use to locate the bottom and maintain a viewable, safe distance from it. The GoPro was mounted at a slight angle. Two high-intensity lights were also mounted on the frame to illuminate the view of the cameras. Without these lights, the bottom could not be visualized past approximately 30 m. A total of 518 underwater videos were collected during the 2016 and 2017 field missions. Of that total, 328 videos were higher resolution collected with the GoPros and 190 were lower resolution. Lower resolution videos were used at times when lighting malfunctioned for the GoPros. To map the seagrass resources of Kachemak Bay, 1:24,000 nominal scale color air photos, film type Kodak Aerocolor 2444, were collected from July to September 2005. The photos were scanned to 1 m and image-to-image rectified to a USGS black and white orthophoto imagery set. The 2005 images manually interpreted on-screen in ArcGIS following procedures described in Rohmann and Monaco (2005). Underwater videos (224) were collected in 2005 as ground verification for the habitat mapping exercise. Those files were recorded to video tape that could not be digitized to be included in this archive package. Submission Package ID: BLFY1D |
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| Metadata version: | 5 |
| Keydate: | 2020-02-24 16:24:42+00 |
| Editdate: | 2020-04-03 18:23:45+00 |