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.