COW_Q27.TIF - U.S. Pacific West Coast EEZ GLORIA sidescan-sonar data mosaic (27 of 36) (TM, 50 m, NAD27)

In March 1983, President Ronald Reagan signed a proclamation establishing an Exclusive Economic Zone (EEZ) of the United States extending its territory 200 nautical miles from the coasts of the United States, Puerto Rico, the Northern Mariana Islands, and the U.S. territories and possessions. In 1984, the U.S. Geological Survey (USGS), Office of Marine Geology began a program to map these areas of the EEZ. The U.S. Pacific Coast was the first EEZ region to be mapped and launched GLORIA (Geological LOng-Range Inclined Asdic) mapping program. The area covered by this survey extended from the Mexican to the Canadian borders and from the continental shelf edge, at about the 400-meter bathymetric contour, to 200 nautical miles from the coast. Survey of the U.S. Pacific West Coast EEZ was completed in four consecutive cruises conducted from late April through mid-August 1984. The collected GLORIA data were processed and digitally mosaicked to produce continuous imagery of the seafloor. A total of 36 digital mosaics of an approximate 2 degree by 2 degree (or smaller) area with a 50-meter pixel resolution were completed for the region.

1983年3月，罗纳德·里根总统签署公告，设立美国专属经济区（Exclusive Economic Zone, EEZ），其海域范围为从美国本土、波多黎各、北马里亚纳群岛以及美国领地与属地的海岸向外延伸200海里的区域。1984年，美国地质调查局（U.S. Geological Survey, USGS）海洋地质办公室启动了针对该批EEZ的制图项目。美国太平洋沿岸是首个开展制图工作的EEZ区域，配套的GLORIA（Geological LOng-Range Inclined Asdic，地质长距离倾斜声呐成像系统）制图项目随即启动。此次测绘覆盖范围北至加拿大边境、南抵墨西哥边境，西起约400米水深等值线处的大陆架边缘，东至距海岸200海里的海域。美国太平洋西海岸EEZ的测绘工作通过1984年4月下旬至8月中旬的连续四次航次顺利完成。采集得到的GLORIA数据经过处理与数字镶嵌，生成了连续的海底影像。该区域最终共完成36幅像素分辨率为50米、覆盖面积约2°×2°（或更小）的数字镶嵌图。