DECAF - PMFR Minke Whales - Multiple Sensor - Boing Localizations

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Early efforts dealing with acoustic data from PMRF involved both manual detection (data set 666 and manual localization (this data set) of boing sounds. These manual detections and localizations provided information necessary in order to assess performance of the automated boing detector and to help understand how to better automatically both detect, associate and localize boing sound source locations. Manual validation of automatic processes is much more efficient (in time and dollars) than the total manual effort such as performed in data sets 666 and 675.

Twenty four boing vocalizations were localized in all – individual animals may make multiple calls. Of these, it is suspected that multiple boings were detected and localized from the same individuals at different times.

This analysis was conducted by James Yosco (Science Applications International Corporation). Localization accuracy for points shown within 15km of sensors is on the order of tens, to hundreds, of meters while the two localizations shown to the extreme north have errors which can be over tens of km. Times are in GMT. Hydrophone locations are only approximate.

The detailed results of the analysis are available at the DECAF web site shown in the supplemental information section.

This dataset used multiple hydrophones at PMRF, Kauai, Hawaii, to localize minke whale boing vocalizations manually. This was a precursor to development of automated detection algorithms and automated association processes. This data set provided a quasi ground truth for development and performance assessment of the minke boing detector developed in the DECAF project. The ultimate purpose of the project was to estimate the density of the boing vocalizations in order to gain more understanding of the minke whale presence in Hawaiian waters. In order to estimate density of whales, the average boing rate of a minke whale is required.

This dataset is part of a larger project examining Balaenoptera acutorostrata (minke whale) vocalizations at the Pacific Missile Range Facility (PMRF). Related datasets include: 1) Results from a prior manual detection (http://seamap.env.duke.edu/dataset/666) and manual localization (http://seamap.env.duke.edu/dataset/675) of 24 boing sources; 2) Results of automated boing detections for 14 hydrophones over 12 days in early 2006 (http://seamap.env.duke.edu/dataset/668); and 3) Results for boing associations over an exploratory 1 hr of data (ten min each from three separate days in Mar 2006 and two separate days in Apr 2007) and for 2 hrs of sample data from 12 days of data in Feb, Mar, Apr of 2006 (http://seamap.env.duke.edu/dataset/664 ).


Original data can be downloaded at http://www.creem.st-and.ac.uk/decaf/decaf-data-files under Case Study 1b: Minke whale data.


Observed call types labeled cries and chirps in the downloaded data represent boings.

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)
filename	definition not provided
file_start_date_time	definition not provided
tenminsetnumber	definition not provided
time	definition not provided
phone_number	definition not provided
sp_obs	Species name
obs_calltype	definition not provided
frequency_area_khz	definition not provided
occurance	definition not provided
duration	definition not provided
localization__degrees_k_ft	definition not provided
other	definition not provided
comments	definition not provided
localization_x	definition not provided
localization_y	definition not provided
same_animal	definition not provided
noise	definition not provided
sp_tsn	Taxonomic Serial Number added by OBIS-SEAMAP
obs_time	Time of the detection
boingstartdatetime	definition not provided
obs_date	Date of the detection
near_hydrophone_latitude	definition not provided
near_hydrophone_longitude	definition not provided
near_hydrophone_depth	definition not provided
latitude	Latitude in decimal degrees
longitude	Longitude in decimal degrees
obs_count	definition not provided
geom	Geometry field added by OBIS-SEAMAP