AFSC/NMML: Small cetacean aerial survey in Alaskan waters, 1997-1999 AFSC/NMML: Small cetacean aerial survey in Alaskan waters, 1997-1999 eng Dataset biota oceans abundance distribution summer Alaska Aerial surveys were conducted to produce abundance estimates for the three Alaska stocks of harbor porpoise. Surveys occurred from May to July 1997 for the Southeast Alaska stock, May to July 1998 for the Gulf of Alaska stock, and June to July 1999 for the Bering Sea stock. Two primary observers observed from bubble windows on the left and right side of the plane. A belly window observer with a view directly down along the trackline collected sightings that were matched to the side observers and used to estimate a correction factor for perception bias that was specific to harbor porpoise in Alaskan waters. Alaska Fisheries Science Center Alaska Fisheries Science Center https://www.fisheries.noaa.gov/inport/item/26315 https://www.fisheries.noaa.gov/inport/item/23107 northlimit=62; eastlimit=-130; southlimit=54; westlimit=-165; name=Alaskan waters from Dixon Entrance to Bristol Bay; start=1997; end=1999; There are no legal restrictions on access to the data. They reside in public domain and can be freely distributed.