RIS aboard the boat operated by Apalachicola National Estuarine Research Reserve for deployment at the survey site. (Photo Credit: http://woodshole.er.usgs.gov) subsystems. At the end of survey operations data are either downloaded locally are across the network to a laptop computer. RIS is powered by 2 to 4 24 volt NiMH batteries and has an approximate run-time of five hours (based on battery reserves). The batteries cannot be entirely exhausted during run-time, as they provide the power source for downloading data at the end of survey operations. System Usage IRIS was first used in June 2006 within Apalachicola Bay, FL, a shallow-water estuary located along the northern Gulf of Mexico. This mapping effort is part of a multi-year collaborative study between the USGS and NOAA Coastal Services Center and is designed to map the distribution of oyster habits within the bay. IRIS successfully operated in water depths ranging from 1 to 4 m and will continue to be utilized within shallow-water areas to augment existing USGS seafloor mapping capabilities. (Photo Credit: http://woodshole.er.usgs.gov) Turn to page 55 for more details on Sonar Systems & Seafloor Mapping 24 MTR April 2007
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