Aerial survey observations of Pacific herring biomass in Prince William Sound, Alaska,1973-2007

Aerial surveys in Prince William Sound to document spring herring biomass have been conducted since the early 1970’s. This zip file contains geospatial files, xml files, and a database collected during aerial surveys to document Pacific herring biomass in the Prince William Sound Area, Alaska, 1973-2007. Regular surveys are conducted mid-March to mid-May each year. Two observers collect data directly into digital format and also on hardcopy paper format as backup. Measurements made during the survey include estimating the biomass of herring schools from surface area and the GPS survey routes made by the airplane.自20世纪70年代初起，科研人员便在阿拉斯加威廉王子湾开展航空调查，以记录春季鲱鱼生物量。本压缩包包含1973年至2007年间，在该区域开展太平洋鲱鱼（Pacific herring）生物量航空调查时采集的地理空间文件、XML格式文件及数据库。常规航空调查于每年3月中旬至5月中旬开展。两名观察员以数字化格式直接记录数据，并同步留存纸质副本作为备份。本次调查的测量内容包括：基于表面积估算鲱鱼鱼群的生物量，以及记录飞机的GPS勘测航线。