NEFSC Aerial Circle-Back Abundance Survey 2004

NOAA Northeast Fisheries Science Center (NEFSC)

Dataset credit

NOAA Northeast Fisheries Science Center (NEFSC)


Primary contact Debi Palka NOAA Northeast Fisheries Science Center
Data entry Ei Fujioka Duke University



The survey was conducted on the NOAA DeHavilland Twin Otter DHC-6, Series 300 aircraft (N57 RF) from 12 June to 12 July 2004. The study area extended between the state border between Virginia and North Carolina (36 degrees N) to the Bay of Fundy (45 degrees N) and from the United States Atlantic shoreline to the entrance of the Gulf of St. Lawrence (58 degrees W). The team was based out of Woods Hole, Massachusetts (Otis Air Force base) on June 12; Salisbury, Maryland from June 13 to 18; back to Woods Hole, Massachusetts (Otis Air Force base) from June 19 to 28; Portland, Maine on June 29 to 30; Bar Harbor, Maine from July 1 to July 7; Halifax, Nova Scotia from July 8 to July 9; Yarmouth, Nova Scotia from July 10 to 11, and back to Woods Hole, Massachusetts, United States on July 12th.


The objective of this survey was to describe the habitat of and estimate the abundance of cetaceans and turtles that are in the study area.

Supplemental information

This aerial survey was conducted in conjunction with a shipboard survey 'NEFSC Mid-Atlantic marine mammal abundance survey 2004,' another dataset available on OBIS-SEAMAP.


NOAA Northeast Fisheries Science Center. 2004. Aerial survey results; NOAA twin otter aircraft: Circle-back abundance survey.



This section explains attributes included in the original dataset. OBIS-SEAMAP restricts the attributes available to the public to date/time, lat/lon and species names/counts only. Should you need other attributes described here, you are encouraged to contact the data provider.

Attributes described below represent those in the original dataset provided by the provider.
All attributes are included in the downloadable file (CSV or ESRI File Geodatabase) for "Complete Set of Dataset".

Attributes in dataset

Attribute (table column)Description
cruiseCruise ID
yearYear of observation
monthMonth of observation
dayDay of observation
timeTime of the observation (local time)
latLatitude in decimal degree
longLongitude in decimal degree
speciesSpecies observed
obs_countNumber of animals observed
geomGeometry field added by OBIS-SEAMAP
oidUnique ID number (generated by OBIS-SEAMAP)
Marine mammals287
Sea turtles138
Rays and sharks127
Other species206
Non spatial0
Non species0
Date, Begin2004-06-13
Date, End2004-07-12
Temporal prec.111111
Latitude36.70 - 45.01
Longitude-75.89 - -65.61
Coord. prec.5 decimal digits
Data typeAnimal sighting
EffortYES (ID: 399)
Traveled (km)7,770
Effort hours39
Contr. through
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Shared with OBIS
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