DECAF - AUTEC Beaked whales - Multiple Sensors - Click counts
Density Estimation of Cetaceans from passive Acoustic Fixed sensors (DECAF)

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This archive contains data on echolocation clicks of Blainville's beaked whale (Mesoplodon densirostris) recorded at AUTEC during a 6-day period in spring 2005. The data were used in estimating M. densirostris density as documented in the paper Marques et al. (2009). There are data files containing click counts per minute per hydrophone, files containing numbers of false positive detections from a manual analysis, and files giving information about georeferenced tracks of tagged whales and associated vocalization timings.

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Each record (observation) represents number of clicks detected during one minute at one of 82 hydrophones. Species identification for automatic click detections is unknown and are assigned as Odontocete. Manually verified click detections have been assigned to appropriate family or genus by a trained acoustician for a sample of thirty 10-minute files. Manually-verified non-biological sources are recorded to species nan. Some automated detections may be from non-biological sources; False detection analysis suggest this will occur <3% of the time. The effect of occasional system tests and differences in frequency response of hydrophones on automated detection and classification has not been quantified.
Time zone is GMT.
Hydrophone locations are only approximate.
Related datasets from tagged beaked whales are available at http://seamap.env.duke.edu/dataset/685 and http://seamap.env.duke.edu/dataset/722.
Original data can be downloaded at http://www.creem.st-and.ac.uk/decaf/decaf-data-files under Case Study 3: Beaked whale data

Marques, T.A., L. Thomas, J. Ward, N. DiMarzio, P. L. Tyack. 2009. Estimating cetacean population density using fixed passive acoustic sensors: An example with Blainville’s beaked whales. Journal of the Acoustical Society of America. 125(4):1982-1994

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 ID
sp_obs	Species Description
time_s_2005_gmt	Time stamp in seconds since the beginning of 2005 (GMT)
hydrophone	Hydrophone number
obs_count	Number of clicks
tstat_mod	[# beaked whale clicks on that hydrophone - mean # beaked whale clicks detected on all hydrophones]/[standard deviation of the beaked whale clicks on all hydrophones]
latitude	Instrument Latitude
longitude	Instrument Longitude
depth	Instrument Depth
obs_date	Observation Date
obs_time	Observation start time
sp_tsn	ISIS tsn
obs_calltype	Type of call
obs_calltype	Type of call