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NMML Small Cetacean (coastal) Aerial Survey 1998, Gulf of Alaska
Entry ID: seamap116

Abstract: Researchers from NMML's Cetacean Assessment and Ecology Program
conducted the line transect aerial surveys for harbor porpoise and Dall's
porpoise from 27 May to 28 July 1998 in the Gulf of Alaska (offshore waters
from Cape Suckling to Unimak Pass), Prince William Sound, and Shelikof Strait.
Surveys were conducted from a NOAA Corps DeHavilland Twin Otter, flown at an
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Purpose: A 3-year survey began in 1997 to complete a new abundance
estimate by 1999. This survey will also include an abundance estimate for
Dall's porpoise (Phocoenoides dalli). Once the 3 years of surveys are
completed, the data will be used to estimate annual abundance of harbor
porpoise and Dall's porpoise, which is one of the key pieces of information
needed to manage ... View entire text
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Geographic Coverage
Spatial coordinates   
  N: 60.84   S: 56.23   E: -144.29   W: -157.41

Data Set Citation
Dataset Originator/Creator: National Marine Mammal Laboratory
Dataset Title: NMML Small Cetacean (coastal) Aerial Survey 1998, Gulf of Alaska
Dataset Series Name: OBIS-SEAMAP
Dataset Release Date: 2004-06-10 15:26:00.093757-04
Dataset Release Place:
Dataset Publisher: OBIS-SEAMAP
Data Presentation Form: vector digital data
Online Resource:
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Temporal Coverage
Start Date: 1998-05-31
Stop Date: 1998-07-27
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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commercial application without prior written consent of the original data
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Data Set Progress
Data Center
OBIS Spatial Ecological Analysis of Megavertebrate Populations Supplemental Info
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Data Center Personnel
Phone: 919-613-8062
Email: phalpin at
Contact Address:
Duke University
Box 90328
City: Durham
Province or State: NC
Postal Code: 27708
Country: USA
Distribution Format: Shapefile
Phone: 919-613-8021
Fax: 919-684-8741
Email: efujioka at
Contact Address:
Box 90328
City: Durham
Province or State: NC
Postal Code: 27708
Country: USA
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Creation and Review Dates
DIF Creation Date: 2007-01-22
Last DIF Revision Date: 2017-08-24