COW_Q08.TIF - U.S. Pacific West Coast EEZ GLORIA sidescan-sonar data mosaic (8 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），将美国本土、波多黎各、北马里亚纳群岛及美国各领地与属地的管辖海域范围延伸至距海岸200海里的区域。1984年，美国地质调查局（U.S. Geological Survey, USGS）下属的海洋地质办公室启动了针对上述专属经济区海域的测绘项目。美国太平洋沿岸专属经济区为首个开展测绘的区域，并率先启动了地质长距离倾斜声呐（Geological LOng-Range Inclined Asdic, GLORIA）测绘计划。本次测绘覆盖范围南至墨西哥边境、北抵加拿大边境，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。1984年4月下旬至8月中旬，通过4个连续科考航次完成了美国太平洋西海岸专属经济区的测绘工作。所采集的GLORIA数据经处理与数字镶嵌后，生成了连续的海底地貌影像。该区域最终共完成36幅面积约2°×2°（或更小）、像素分辨率为50米的数字镶嵌影像。