GAK_Q39.TIF - Gulf of Alaska U.S. EEZ GLORIA sidescan-sonar data mosaic (9 of 30) (LCC, 50 m, WGS84)

GLORIA data for the Gulf of Alaska Exclusive Economic Zone (EEZ) were acquired during five cruises over a four year period. The first cruise conducted in 1986 (F-1-86-GA) surveyed an area of the north-central mosaic area and covered an area of approximately 40,000 square kilometers (sq km). The second two cruises (F-8-88-AA, F-9-88-WG) were conducted in 1988. One of the 1988 cruises (F-8-88-AA) focused on a survey of the Aleutian Arc. The eastern most portion of that survey extended outside of the Aleutian Arc survey area and covered an area of approximately 52,000 square kilometers (sq km) of seafloor on the western edge of the Gulf of Alaska. The final two cruises (F-6-89-GA, F-7-89-EG) were completed in 1989. As in earlier EEZ reconnaissance surveys, the USGS utilized the GLORIA (Geological LOng-Range Inclined Asdic) sidescan-sonar system to complete the geologic mapping. The collected GLORIA data were processed and digitally mosaicked to produce continuous imagery of the seafloor. Thirty digital mosaics with a 50-meter pixel resolution were completed for the region.

阿拉斯加湾专属经济区（Exclusive Economic Zone，EEZ）的GLORIA侧扫声呐数据，是在四年间的五次科考航次中采集获取的。首次航次于1986年实施（航次编号：F-1-86-GA），对北中部马赛克分区进行了测绘，作业覆盖面积约4万平方千米。1988年共开展两次航次（航次编号：F-8-88-AA、F-9-88-WG），其中F-8-88-AA航次重点开展阿留申弧测绘工作，该航次最东端的测绘范围延伸至阿留申弧测绘区之外，覆盖阿拉斯加湾西缘约5.2万平方千米的海底区域。最后两次航次（航次编号：F-6-89-GA、F-7-89-EG）于1989年完成。与此前的专属经济区普查航次一致，美国地质调查局（United States Geological Survey，USGS）采用GLORIA（地质长程倾斜声呐，Geological LOng-Range Inclined Asdic）侧扫声呐系统完成该区域的地质填图工作。采集得到的GLORIA数据经过处理与数字化镶嵌，生成了连续的海底影像；该区域共计完成30幅像素分辨率为50米的数字化镶嵌影像。