JI_Q16.TIF - Johnston Island U.S. EEZ GLORIA sidescan-sonar data mosaic (16 of 16) (LCC, 50 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 results of these surveys were 16 digital mosaics of 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了一项研究项目，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，对美国全境专属经济区（Exclusive Economic Zone, EEZ）开展调研工作。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., IOS）的科研人员在环绕约翰斯顿岛的约翰斯顿环礁美国专属经济区内完成了三次勘测作业。本次勘测的成果为16幅覆盖2°×2°区域的数字镶嵌图，其像素分辨率为50米。