JI_250M_LCC_WGS84.TIF - Johnston Atoll U.S. EEZ GLORIA sidescan-sonar composite mosaic (LCC, 250 m, WGS84)

In 1984, the U.S. Geological Survey (USGS), Office of Marine Geology, launched a program using the Geological LOng-Range Inclined Asdic (GLORIA) sidescan-sonar system to study the entire U.S. Exclusive Economic Zone (EEZ). From December 1990 through February 1991, the USGS and IOS (Institute of Oceanographic Sciences, U.K.) scientists conducted three surveys within the Johnston Atoll U.S. EEZ surrounding Johnston Island. The surveys during that time period, and conducted in succession from 6 December 1990 to 21 February 1991, focused on the U.S. Exclusive Economic Zone surrounding the Johnston Atoll. The results of these surveys were 16 digital mosaics of approximately a 2 degree by 2 degree area with a 50-meter pixel resolution.1984年，美国地质调查局（U.S. Geological Survey, USGS）海洋地质办公室启动项目，采用地质远程倾斜声呐成像系统（Geological LOng-Range Inclined Asdic, GLORIA）侧扫声呐系统，对全美专属经济区（Exclusive Economic Zone, EEZ）开展系统性研究。1990年12月至1991年2月期间，美国地质调查局与英国海洋科学研究所（Institute of Oceanographic Sciences, U.K.，简称IOS）的科研人员在环绕约翰斯顿岛的美国专属经济区内完成三次勘测工作，本次勘测时段为1990年12月6日至1991年2月21日，全程连续推进，研究重点为约翰斯顿环礁周边的美国专属经济区。本次勘测最终产出16幅数字镶嵌图，覆盖区域面积约为2°×2°，像素分辨率达50米。