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Dataset Title:  NOAA-Navy Sanctuary Soundscapes Monitoring ProjectSound Broadband Sound
Pressure Levels, Channel Islands SanctSound_CI01_01_BB_1h
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Institution:  NOAA NCEI   (Dataset ID: noaaSanctSound_CI01_01_BB_1h)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Files | Make a graph
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      1064    1h 0m 10s (uneven)
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Grid Variables (which always also download all of the dimension variables)
 sound_pressure_levels (dB) ?

File type: (more info)

(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 1.5410232e+9, 1.5448608e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  sound_pressure_levels {
    Float64 colorBarMaximum 110.0;
    Float64 colorBarMinimum 50.0;
    String comment "Broadband Sound Pressure Levels at 1 Hertz and 1 Hour Resolution";
    String ioos_category "Pressure";
    String long_name "sound pressure levels";
    String standard_name "sound_intensity_level_in_water";
    String units "dB";
    String acknowledgement "This project received funding from the U.S. Navy.";
    String cdm_data_type "Grid";
    String comment "Preliminary metadata, may change as project progresses";
    String component "SoundTrap ST500";
    String contributor_name "U.S. Navy";
    String contributor_role "funding";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "";
    String creator_name "US Naval Postgraduate SchoBB";
    String creator_type "person";
    String creator_url "";
    String date_created "2020-06-26";
    String date_issued "2020-06-26";
    String defaultGraphQuery "sound_pressure_levels[]&.draw=lines&.vars=time|sound_pressure_levels";
    String history 
"This record represents the broadband (BB) sound pressure levels (SPLs) derived from raw passive acoustic data. BB SPLs were calculated by integration of the sound pressure spectral density estimates of the mean-square pressure with a 1 Hz/1 second resolution over the frequency band of 20 to 24,000 Hz. The result is then calcuated per hour as a median over no less than 1800 1-second values for that hour and converted to decibels (dB re 1 µPa). Created from file SanctSound_CI01_01_BB_1h.csv
2020-09-26T22:42:44Z (local files)
    String id "NOAA-NAVY-SanctSound_CI01_01_BB_1h";
    String infoUrl "";
    String institution "NOAA NCEI";
    String keywords "acoustic, acoustics, ambient noise, aquatic ecosystems, attenuation, attenuation/transmission, broadband, centers, cetacean, channel, ci01, data, density, earth, Earth Science > Oceans > Ocean Acoustics > Acoustic Attenuation/Transmission, environmental, fish, frequency, information, intensity, islands, level, levels, 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, pressure, project, projectsound, sanctsound, sanctuaries, sanctuary, satellite, science, sea, sea level, seawater, service, sound, sound_intensity_level_in_water, sound_pressure_levels, soundscapes, spectrum, time, transmission, u.s. department of commerce, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "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.";
    String naming_authority "NOAA-NAVY";
    String product_version "2019";
    String project "NOAA Passive Acoustic Data";
    String publisher_email "";
    String publisher_name "NOAA NMFS SWFSC ERD";
    String publisher_type "institution";
    String publisher_url "";
    String sensor "hydrophone";
    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 ( 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 (";
    String time_coverage_end "2018-12-15T08:00:00Z";
    String time_coverage_start "2018-10-31T22:00:00Z";
    String title "NOAA-Navy Sanctuary Soundscapes Monitoring ProjectSound Broadband Sound Pressure Levels, Channel Islands SanctSound_CI01_01_BB_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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