ERDDAP > info > noaaSanctSound_CI01_01_ships

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
data			graph		files	public	NOAA-Navy Sanctuary Soundscape Monitoring Project, Vessel Detection Events, Channel Islands, SanctSound_CI01_01_ships		I   M	background			NOAA	noaaSanctSound_CI01_01_ships

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
attribute	NC_GLOBAL	abstract	String	This record represents the individual vessel events detected from raw passive acoustic data. Events are identified from the long-term spectral average (LTSAs) created for each site with a 5 s, 48 kHz resolution. The LTSA is analyzed in blocks where the calibrated power spectral density estimates are averaged in user-defined low, medium and high frequency bands. These data were recorded at SanctSound Site CI01_01 between October 31, 2018 and February 20, 2019.
attribute	NC_GLOBAL	acknowledgement	String	This project received funding from the U.S. Navy.
attribute	NC_GLOBAL	cdm_data_type	String	TimeSeries
attribute	NC_GLOBAL	citation	String	Cite as: NOAA Office of National Marine Sanctuaries and U.S Navy. 2021. Vessel Detection Events Recorded at SanctSound Site CI01_01, SanctSound Data Products. NOAA National Centers for Environmental Information. Accessed [date]. DOI: https://doi.org/http://doi.org/10.25921/ngkr-0f36
attribute	NC_GLOBAL	comment	String	Data quality: Sudden drop of levels below noise floor starting December 15, 2018.
attribute	NC_GLOBAL	contributor_name	String	Simone Baumann-Pickering, Scripps Institution of Oceanography; Leila Hatch, NOAA Stellwagen Bank National Marine Sanctuary; John Joseph, U.S. Naval Postgraduate School; Anke Kuegler, Hawai'i Institute of Marine Biology, University of Hawai'i at Manoa; Marc Lammers, NOAA Hawaiian Islands Humpback Whale National Marine Sanctuary; Tetyana Margolina, U.S. Naval Postgraduate School; Karlina Merkens, NOAA Pacific Islands Fisheries Science Center; Lindsey Peavey Reeves, NOAA Channel Islands National Marine Sanctuary; Timothy Rowell, NOAA Northeast Fisheries Science Center; Jenni Stanley, Woods Hole Oceanographic Institution; Alison Stimpert, Moss Landing Marine Laboratories; Sofie Van Parijs, NOAA Northeast Fisheries Science Center; Eden Zang,NOAA Hawaiian Islands Humpback Whale National Marine Sanctuary
attribute	NC_GLOBAL	contributor_role	String	Principal Investigator
attribute	NC_GLOBAL	Conventions	String	COARDS, CF-1.6, ACDD-1.3
attribute	NC_GLOBAL	creator_email	String	ncei.info at noaa.gov
attribute	NC_GLOBAL	creator_name	String	NOAA NCEI
attribute	NC_GLOBAL	creator_url	String	https://www.ncei.noaa.gov/
attribute	NC_GLOBAL	date_created	String	2022-08-22
attribute	NC_GLOBAL	date_issued	String	2022-08-22
attribute	NC_GLOBAL	featureType	String	TimeSeries
attribute	NC_GLOBAL	geospatial_bounds	String	POINT (34.0438 -120.0811)
attribute	NC_GLOBAL	history	String	Vessel events (individual events) were detected using Triton's Ship-Detector Remora. An LTSA is created for each site with a 5 s, 48 kHz resolution; events are identified from these LTSAs. Individual site settings are tested using the Interactive Detector and most conservative settings are run using the Batch Detector. The LTSA is analyzed in blocks of data (windows), where the calibrated sound pressure spectral density (PSD) estimates are averaged in three frequency bands; low, medium and high (defined by user). Start and end times of the events are detected and stored if the three averaged PSDs meet three conditions (all values set by user): 1. Amplitude is above a user-defined, time-dependent amplitude threshold computed using a histogram method of the averaged PSDs; 2. The event duration is above a user-defined time in the three bands. The duration in the higher band must be shorter that the medium band, or the event duration above the threshold in the lower and medium band must be longer than the user specified time, and the duration in the medium band must be shorter than the lower band; 3. Events are distinguished from weather events when averaged received levels of the event in the lower band are above a user specified percentage of the background sound in the window. The window length and the overlapping time with the next consecutive window is defined by the user. Once Batch Detector is run, user reviews results and corrects labelled events to either Ambient (non-ship source) or Ship. Low Band=100-5,000 Hz, Medium Band=5,000-10,000 Hz, High Band=10,000–48,000 Hz, Close Passage Duration Threshold: 50 s, Distant Passage Duration Threshold: 150 s, Relative Threshold Level = 0.05%, Time Between Passages = 0.01 hr, Buffer Time (min): 5, Window Size (h): 2, Sliding Time Overlapping Windows (h) = 0.5. Data were processed with Triton - Soundscape Metrics Remora (Github commit '44f0f20'; Feb 9, 2020) and Matlab (2016b and newer; statistics toolbox).
attribute	NC_GLOBAL	id	String	http://doi.org/10.25921/ngkr-0f36
attribute	NC_GLOBAL	infoUrl	String	https://ncei.noaa.gov
attribute	NC_GLOBAL	institution	String	NOAA
attribute	NC_GLOBAL	instrument	String	SoundTrap ST500
attribute	NC_GLOBAL	keywords	String	acoustic attenuation/transmission, acoustics, ambient noise, aquatic ecosystems, cetacean, environmental, fish, frequency, intensity, marine environment monitoring, marine habitat, national centers for environmental information, Navy, NOAA, ocean acoustics, oceans, office of national marine sanctuaries, passive acoustic recorder, pressure, sound_intensity_level_in_water, soundscapes
attribute	NC_GLOBAL	keywords_vocabulary	String	GCMD Science Keywords
attribute	NC_GLOBAL	license	String	The data may be used and redistributed for free but are not intended for legal use, since it may contain inaccuracies. Neither the data creator, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.
attribute	NC_GLOBAL	naming_authority	String	NOAA-Navy
attribute	NC_GLOBAL	project	String	NOAA-Navy Sanctuary Soundscape Monitoring Project
attribute	NC_GLOBAL	publisher_email	String	erd.data at noaa.gov
attribute	NC_GLOBAL	publisher_name	String	NOAA NMFS SWFSC ERD
attribute	NC_GLOBAL	publisher_type	String	institution
attribute	NC_GLOBAL	publisher_url	String	https://www.pfeg.noaa.gov
attribute	NC_GLOBAL	sourceUrl	String	(local files)
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v55
attribute	NC_GLOBAL	summary	String	NOAA and the U.S. Navy are working to better understand underwater sound within the U.S. National Marine Sanctuary System. From 2018 to 2021, these agencies will work with numerous scientific partners to study sound within seven national marine sanctuaries and one marine national monument, which includes waters off Hawai'i and the east and west coasts. Standardized measurements will assess sounds produced by marine animals, physical processes (e.g., wind and waves), and human activities. Collectively, this information will help NOAA and the Navy measure sound levels and baseline acoustic conditions in sanctuaries. This work is a continuation of ongoing Navy and NOAA research, including efforts by NOAA's Office of National Marine Sanctuaries This dataset represents the derived products from the raw acoustic data that are archived at NOAA National Centers for Environmental Information.
attribute	NC_GLOBAL	title	String	NOAA-Navy Sanctuary Soundscape Monitoring Project, Vessel Detection Events, Channel Islands, SanctSound_CI01_01_ships
dimension	start_time		double	nValues=54, evenlySpaced=false, averageSpacing=73285.98113207547
attribute	start_time	actual_range	double	1.541117635E9, 1.545001792E9
attribute	start_time	axis	String	T
attribute	start_time	comment	String	Start time of detections. Corresponding end time for detection in end_time_var at same index value as start_time_var.
attribute	start_time	ioos_category	String	Time
attribute	start_time	long_name	String	Start Time
attribute	start_time	standard_name	String	time
attribute	start_time	time_origin	String	01-JAN-1970 00:00:00
attribute	start_time	time_precision	String	1970-01-01T00:00:00.000Z
attribute	start_time	units	String	seconds since 1970-01-01T00:00:00Z
variable	ships_presence		double	start_time
attribute	ships_presence	cell_methods	String	time: sum (comment: presence (1) or absence (0) over time interval)
attribute	ships_presence	comment	String	Presence of Vessels (0/noship = not present; 1/ship = present)
attribute	ships_presence	ioos_category	String	Statistics
attribute	ships_presence	long_name	String	ships presence
attribute	ships_presence	standard_name	String	ships_presence
attribute	ships_presence	units	String	boolean
variable	end_time		double	start_time
attribute	end_time	actual_range	double	1.54111871E12, 1.545002302E12
attribute	end_time	axis	String	T
attribute	end_time	comment	String	End time of detections. Corresponding start time for detection in start_time_var at same index value as end_time_var.
attribute	end_time	ioos_category	String	Time
attribute	end_time	long_name	String	End Time
attribute	end_time	standard_name	String	end_time
attribute	end_time	time_origin	String	01-JAN-1970 00:00:00
attribute	end_time	units	String	seconds since 1970-01-01T00:00:00Z

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.