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了一项研究项目，采用地质远程倾斜声呐（Geological LOng-Range Inclined Asdic, GLORIA）侧扫声呐系统，对美国全域专属经济区（Exclusive Economic Zone, EEZ）开展调研。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美国专属经济区内完成了三次勘测工作，本次勘测的实施时段为1990年12月6日至1991年2月21日，全程连续开展，研究聚焦于环绕约翰斯顿环礁的美国专属经济区。此次勘测的成果为16幅数字镶嵌图，覆盖区域面积约2°×2°，像素分辨率达50米。