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ERDDAP > info > noaaSanctSound_CI04_01_PSD_1h

Title Sum-
Institution Dataset ID
 data       graph     files  public NOAA-Navy Sanctuary Soundscapes Monitoring Project, Sound Pressure Spectral Density, Channel
Islands CI04_01_PSD
   ?        I   M   background (external link) RSS Subscribe NOAA NCEI noaaSanctSound_CI04_01_PSD_1h

The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL _NCProperties String version=2,netcdf=4.7.4,hdf5=1.10.5
attribute NC_GLOBAL acknowledgement String This project received funding from the U.S. Navy.
attribute NC_GLOBAL cdm_data_type String Grid
attribute NC_GLOBAL comment String Preliminary metadata, may change as project progresses
attribute NC_GLOBAL component String SoundTrap ST500
attribute NC_GLOBAL contributor_name String U.S. Navy
attribute NC_GLOBAL contributor_role String funding
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String jejoseph at
attribute NC_GLOBAL creator_name String US Naval Postgraduate School
attribute NC_GLOBAL creator_type String person
attribute NC_GLOBAL creator_url String (external link)
attribute NC_GLOBAL date_created String 2020-11-03
attribute NC_GLOBAL date_issued String 2020-11-03
attribute NC_GLOBAL defaultGraphQuery String sound_pressure_spectral_density_levels[][]&.draw=surface&.vars=time|frequency|acoustic&.yRange=||true|Log
attribute NC_GLOBAL history String Pressure spectral density (PSD) levels in units of 1 µPa^2/Hz were calculated using Welch's Method in Matlab (FFT length = 48000 points, Hann window length = 48000, FFT overlap = 0%), resulting in PSD estimates of mean-square pressure amplitude (µPa^2) with a frequency resolution of 1 Hz and temporal resolution of 1 second. For every 1-Hertz (Hz) frequency band from 20 Hz to 24,000 Hz, PSD levels per hour were calculated as the arithmetic mean of mean-square pressure amplitude (µPa^2) over an averaging window of 3600 seconds. PSD levels per hour for each frequency band were converted to decibels (dB re 1 µPa^2/Hz).
attribute NC_GLOBAL id String NOAA-NAVY-SanctSound_CI04_01_PSD_1h
attribute NC_GLOBAL infoUrl String (external link)
attribute NC_GLOBAL institution String NOAA NCEI
attribute NC_GLOBAL keywords String acoustic, acoustics, ambient noise, aquatic ecosystems, attenuation, attenuation/transmission, centers, cetacean, channel, ci04, data, density, division, earth, Earth Science > Oceans > Ocean Acoustics > Acoustic Attenuation/Transmission, environmental, fish, frequency, information, intensity, islands, level, marine, marine environment monitoring, marine habitat, monitoring, national, national centers for environmental information, national marine fisheries service, navy, ncei, nesdis, nms, noaa, noaa-navy, ocean, ocean acoustics, oceans, office of national marine sanctuaries, passive acoustic recorder, physical, pressure, project, projectsound, psd, sanctsound, sanctuaries, sanctuary, satellite, science, sciences, sea, sea level, seawater, service, sound, sound_intensity_level_in_water, soundscapes, spectral, spectrum, time, transmission, u.s. department of commerce, water
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String The data may be used and redistributed for free but is 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 product_version String 2020-04
attribute NC_GLOBAL project String NOAA Passive Acoustic Data
attribute NC_GLOBAL publisher_email String at
attribute NC_GLOBAL publisher_name String NOAA NMFS SWFSC ERD
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL publisher_url String (external link)
attribute NC_GLOBAL sensor String hydrophone
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v70
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 ( monitoring and 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's National Centers for Environmental Information (
attribute NC_GLOBAL time_coverage_end String 2018-12-30T10:00:00Z
attribute NC_GLOBAL time_coverage_start String 2018-11-01T20:00:00Z
attribute NC_GLOBAL title String NOAA-Navy Sanctuary Soundscapes Monitoring Project, Sound Pressure Spectral Density, Channel Islands CI04_01_PSD
dimension time   double nValues=1407, evenlySpaced=true, averageSpacing=1h 0m 0s
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.5411024E9, 1.546164E9
attribute time axis String T
attribute time ioos_category String Time
attribute time long_name String Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
dimension frequency   double nValues=23981, evenlySpaced=true, averageSpacing=1.0
attribute frequency actual_range double 20.0, 24000.0
attribute frequency comment String Frequency resolution of 1 Hz
attribute frequency ioos_category String Unknown
attribute frequency long_name String frequency
attribute frequency standard_name String sound_frequency
attribute frequency units String Hz
variable sound_pressure_spectral_density_levels   double time, frequency
attribute sound_pressure_spectral_density_levels colorBarMaximum double 110.0
attribute sound_pressure_spectral_density_levels colorBarMinimum double 50.0
attribute sound_pressure_spectral_density_levels comment String Power spectral density levels per hour were calculated as the arithmetic mean of mean-square pressure amplitude (µPa^2) over an averaging window of 3600 seconds and converted to decibels (dB re 1 µPa^2/Hz).
attribute sound_pressure_spectral_density_levels ioos_category String Pressure
attribute sound_pressure_spectral_density_levels long_name String Sound pressure spectrum level
attribute sound_pressure_spectral_density_levels standard_name String sound_intensity_level_in_water
attribute sound_pressure_spectral_density_levels units String dB

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.

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