NEFSC Aerial Circle-Back Abundance Survey 2006

NOAA Northeast Fisheries Science Center (NEFSC)

The survey was conducted on the NOAA DeHavilland Twin Otter DHC-6, Series 300 aircraft (N57 RF) from 24 July to 26 August 2006.

The study area extended from New Jersey, USA (74º 20'N 39º 40’W), eastward to the Gulf of St. Lawrence (58º 30'W), and northward to the Bay of Fundy (45º 30'N).

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.

Perpendicular distance to the animal is not publicly available.

Overview

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
oid	Unique ID number (generated by OBIS-SEAMAP)
cruise	Cruise ID
year	Year
month	Month
day	Day
time	Time of the sighing at local time zone
sightlat	Latitude at decimal degrees
sightlon	Longitude at decimal degrees
species	Species code
sp_tsn	Taxonomic Serial Number added by OBIS-SEAMAP
groupsize	Group size
transect	Transect No.
leg	Leg
sighting_number	Sighting number
beaufort	Beaufort sea state
perp_m	Perpendicular distance, measured in meters
effort	Effort (on/off)
quality	General sighting quality as seen by the port and starboard observers, where the first number is the port observer and the second number is the starboard observer
cloud	Percent cloud cover, usually rounded to 10 degrees
glare_mag	Glare code
geom	Geometry field added by OBIS-SEAMAP