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Dataset Title:  NOAA-Navy Sanctuary Soundscape Monitoring Project, Sound Pressure Spectral
Density, Channel Islands, SanctSound_CI04_01_PSD_1h
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Institution:  NOAA   (Dataset ID: noaaSanctSound_CI04_01_PSD_1h)
Information:  Summary ? | License ? | Metadata | Background (external link) | Files | Make a graph
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      1407    1h 0m 0s (even)
  < slider >
 frequency (Hz) ?      23981    1.0 (even)
  < slider >
Grid Variables (which always also download all of the dimension variables) 
 sound_pressure_levels (dB) ?

File type: (more information)

(Documentation / Bypass this form) ?
(Please be patient. It may take a while to get the data.)


The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.5411024e+9, 1.546164e+9;
    String axis "T";
    String comment "Start times of 1-hour bins over which sound pressure levels are calculated";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  frequency {
    Float64 actual_range 20.0, 24000.0;
    String comment "Frequency resolution of 1 Hz.";
    String ioos_category "Other";
    String long_name "frequency";
    String standard_name "sound_frequency";
    String time_precision "1970-01-01T00:00:00Z";
    String units "Hz";
  sound_pressure_levels {
    String cell_methods "time: sum";
    Float64 colorBarMaximum 110.0;
    Float64 colorBarMinimum 50.0;
    String comment "Sound pressure level for time bin";
    String ioos_category "Pressure";
    String long_name "sound pressure levels";
    String standard_name "sound_pressure_level_in_water";
    String units "dB";
    String abstract "This record represents the sound pressure spectral density (PSD) levels derived from raw passive acoustic data. The hourly PSD levels were calculated as the median of mean-square pressure amplitude (µPa^2) with a frequency resolution of 1 Hz from 20 Hz to 24,000 Hz over no less than 1,800 seconds in each hour and converted to decibels (dB re 1 µPa^2/Hz). These data were recorded at SanctSound Site CI04_01 between November 01, 2018 and December 31, 2018.";
    String acknowledgement "This project received funding from the U.S. Navy.";
    String cdm_data_type "TimeSeries";
    String citation "Cite as: NOAA Office of National Marine Sanctuaries and U.S Navy. 2021. Sound Pressure Spectral Density at 1 Hertz and 1 Hour Resolution Recorded at SanctSound Site CI04_01, SanctSound Data Products. NOAA National Centers for Environmental Information. Accessed [date]. DOI:";
    String comment "Data quality: Data quality is compromised for frequencies less than 100 Hz from 2018-11-28 to 2018-12-30. Recorded received level gradually decreases after 2018-11-28 for frequencies below 100 Hz. This drift is caused by changes in hydrophone sensitivity.";
    String contributor_name "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";
    String contributor_role "Principal Investigator";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "";
    String creator_name "NOAA NCEI";
    String creator_url "";
    String date_created "2022-08-22";
    String date_issued "2022-08-22";
    String defaultGraphQuery "sound_pressure_levels[][]&.draw=surface&.vars=time|frequency|sound_pressure_levels&.yRange=||true|Log";
    String featureType "TimeSeries";
    String geospatial_bounds "POINT (33.849 -120.118)";
    String history 
"Sound pressure spectral density (PSD) levels in units of 1 µPa^2/Hz were calculated using Welch's Method in Matlab (FFT length = 48,000 points, Hann window length = 48,000, 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 median of mean-square pressure amplitude (µPa^2) over no less than 1,800 seconds for that hour. PSD levels per hour for each frequency band were converted to decibels (dB re 1 µPa^2/Hz).  Data were processed with Triton - Soundscape Metrics Remora (Github commit '44f0f20'; Feb 9, 2020) and Matlab (2016b and newer; statistics toolbox).
2024-07-22T20:48:43Z (local files)
    String id "";
    String infoUrl "";
    String institution "NOAA";
    String instrument "SoundTrap ST500";
    String keywords "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";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "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.";
    String naming_authority "NOAA-Navy";
    String project "NOAA-Navy Sanctuary Soundscape Monitoring Project";
    String publisher_email "";
    String publisher_name "NOAA NMFS SWFSC ERD";
    String publisher_type "institution";
    String publisher_url "";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "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.";
    String time_coverage_end "2018-12-30T10:00:00Z";
    String time_coverage_start "2018-11-01T20:00:00Z";
    String title "NOAA-Navy Sanctuary Soundscape Monitoring Project, Sound Pressure Spectral Density, Channel Islands, SanctSound_CI04_01_PSD_1h";


Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its projection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

griddap request URLs must be in the form{?query}
For example,[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.

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