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NMML Harbor Porpoise Aerial Survey, Alaska Peninsula, Replicate 2, 1992
Entry ID: seamap136

Abstract: On 6 July to 9 August 1992, as part of a larger study, Alaska harbor
porpoise (Phocoena phocoena) abundance was investigated during an aerial survey
off the south side of the Alaska Peninsula. Employing a Twin Otter as the
survey platform, the second of two identical saw-tooth tracklines was flown at
an altitude of 152.2 m (500ft) and at an airspeed of 100 kn. Line-transect
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Purpose: Although harbor porpoises, Phocoena phocoena, are known to occur
throughout Alaska waters (Fiscus et al. 1976; Leatherwood and Reeves 1978;
Lawry et al. 1982; Leatherwood et al. 1983), few estimates of abundance exist.
In 1991, the National Marine Mammal Laboratory initiated a 3-yr study on Alaska
harbor porpoises. The objectives of this program were to: 1) Obtain minimum
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Geographic Coverage
Spatial coordinates   
  N: 57.64   S: 55.31   E: -154.73   W: -159.94

Data Set Citation
Dataset Originator/Creator: National Marine Mammal Laboratory
Dataset Title: NMML Harbor Porpoise Aerial Survey, Alaska Peninsula, Replicate 2, 1992
Dataset Series Name: OBIS-SEAMAP
Dataset Release Date: 2004-08-09 16:49:12.466317-04
Dataset Release Place:
Dataset Publisher: OBIS-SEAMAP
Data Presentation Form: vector digital data
Online Resource:
Parent DIF
This description is a member of a collection. The collection is described in

Temporal Coverage
Start Date: 1992-07-31
Stop Date: 1992-07-31
Data Resolution
Latitude Resolution: 0.000167 Decimal degrees
Longitude Resolution: 0.000167 Decimal degrees
Horizontal Resolution Range: 1 meter - < 30 meters
Access Constraints ACCESS CONSTRAINTS: Open public unless otherwise noted.

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Contact Address:
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Province or State: NC
Postal Code: 27708
Country: USA
Distribution Format: Shapefile
Phone: 919-613-8021
Fax: 919-684-8741
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Contact Address:
Box 90328
City: Durham
Province or State: NC
Postal Code: 27708
Country: USA
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M. Dahlheim et al. Harbor porpoise (Phocoena phocoena) abundance in Alaska:
Bristol Bay to Southeast Alaska, 1991-1993. 2000. Marine Mammal Science. 16(1):
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Creation and Review Dates
DIF Creation Date: 2007-01-22
Last DIF Revision Date: 2017-08-24