DECAF - AUTEC Beaked Whales - Single Sensor case study
Density Estimation of Cetaceans from passive Acoustic Fixed sensors (DECAF)

N/A

These data were used to characterize the performance of the automatic detector. A 6-minute recording from hydrophone 57 was manually checked for beaked whale clicks. This 6-minute section was part of the main 6-day dataset used in the case study. The automatic detector was used on the same sound file, and the results compared. For each manually detected click, the signal-to-noise ratio (SNR) was calculated, the quality of the click was judged and it was noted whether or not the click was detected by the automatic detector.

This case study used a single hydrophone at AUTEC to estimate density of beaked whales around the sensor, based on counts of detected beaked whale clicks. Using propagation modelling, information about the source level of the clicks and characteristics of the automatic click detector, the effective detection radius around the hydrophone was estimated. Together with information about clicking rates of beaked whales, this enabled density of beaked whales around the hydrophone to be estimated.

Time zone is GMT. Note hydrophone location is approximate.
Original data can be downloaded at http://www.creem.st-and.ac.uk/decaf/decaf-data-files under Case Study 4a: Beaked whale data
The sound file can be downloaded at http://www.mobysound.org/odontocetes.html (click the 'from the Bahamas: AUTEC' under the Blainville's Beaked Whale, Mesoplodon densirostris, subheading).
Sound file name: Set4-A5-092705-H57-0600-0618-1435-1453loc_filter.wav.

Küsel, E. T., D. K. Mellinger, L. Thomas, T. Marques, D. Moretti & J. Ward. 2011. Method for cetacean density estimation from single fixed sensors using passive acoustics. Journal of the Acoustical Society of America. 129: 3610-3622

Overview

Attributes described below represent those in the original dataset provided by the provider.
Only minimum required attributes are visible and downlodable online. Other attributes may be obtained upon provider's permission unless otherwise noteded below.

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 in dataset provided

Attribute (table column)	Description
oid	OBIS-SEAMAP dataset ID
obs_date	Observation date (GMT)
obs_time	Observation time (GMT)
obs_count	Number of calls
sp_tsn	ITIS species code
sp_obs	Species observed
hydrophone
latitude	Approximate hydrophone latitude
longitude	Approximate hydrophone longitude
depth	Approximate hydrophone depth
enddate
endtime