DECAF - AUTEC Beaked whales - Multiple Sensors - Click counts

Density Estimation of Cetaceans from passive Acoustic Fixed sensors (DECAF)

Dataset credit



Primary contact Jessica Ward Naval Undersea Warfare Center
Data entry Melissa Soldevilla Duke University



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.



Supplemental information

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 and

Original data can be downloaded at 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.



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
oidUnique ID number (generated by OBIS-SEAMAP)
sp_obsSpecies name
time_s_2005_gmtdefinition not provided
hydrophonedefinition not provided
obs_countdefinition not provided
tstat_moddefinition not provided
latitudeLatitude in decimal degrees
longitudeLongitude in decimal degrees
obs_dateDate of the detection
obs_timeTime of the detection
sp_tsnTaxonomic Serial Number added by OBIS-SEAMAP
obs_calltypedefinition not provided
geomGeometry field added by OBIS-SEAMAP
Marine mammals97,686
Sea turtles0
Rays and sharks0
Other species0
Non spatial0
Non species452
Date, Begin2005-04-26
Date, End2005-05-02
Temporal prec.111111
Latitude24.30 - 24.76
Longitude-77.64 - -77.39
Coord. prec.6 decimal digits
Data typeAcoustic - #call
EffortYES (ID: 678)
Traveled (km)0
Travel hours6,775
Contr. through
Sharing policy CC-BY (All)
Shared with None
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