NMML Harbor Porpoise Aerial Survey, SE Alaska, 1991
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资源简介：
On 15 August 1991, as part of a larger study, Alaska harbor porpoise
(Phocoena phocoena) abundance was investigated during an aerial survey of
waters off southeastern Alaska. A Twin Otter was used to fly a single sawtooth
trackline at an altitude of 152.2 m (500ft) and at an airspeed of 100 kn.
Line-transect methodology was used, and only those observations made during
optimal conditions were analyzed. Density of harbor porpoises was calculated
using line transect estimates based on perpendicular distances of sightings to
the cruise track of the airplane.
提供机构：
SCIOPS
