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Dataset Title:	INSEA Calipso hydrophone SPL data
Institution:	Istituto Nazionale di Geofisica e Vulcanologia (Dataset ID: EMSO_WIS_HYDRO_LFH_SPL)
Range:	longitude = 15.4 to 15.4°E, latitude = 37.55 to 37.55°N, depth = 2035.0 to 2035.0m, time = 2024-01-01T01:00:01Z to 2024-03-18T07:04:57Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 actual_range 2035.0, 2035.0;
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "depth of measurement";
    String parameter_sdn_name "Depth (spatial coordinate) relative to water surface in the water body";
    String parameter_sdn_uri "https://vocab.nerc.ac.uk/collection/P01/current/ADEPZZ01/";
    String parameter_sdn_urn "SDN:P01::ADEPZZ01";
    String positive "down";
    String standard_name "depth";
    String unit_sdn_name "meters";
    String unit_sdn_uri "https://vocab.nerc.ac.uk/collection/P06/current/ULAA/";
    String unit_sdn_urn "SDN:P06::ULAA";
    String units "m";
  }
  frequency {
    Float32 actual_range 15.625, 396.8503;
    String long_name "Frequency";
    String standard_name "frequency";
    String unit_sdn_name "Hertz";
    String unit_sdn_uri "https://vocab.nerc.ac.uk/collection/P06/current/UTHZ/";
    String unit_sdn_urn "SDN:P06::UTHZ";
    String units "Hz";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 37.55, 37.55;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "latitude of measurement";
    String parameter_sdn_name "Latitude north";
    String parameter_sdn_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALATZZ01/";
    String parameter_sdn_urn "SDN:P01::ALATZZ01";
    String standard_name "latitude";
    String unit_sdn_name "degree_north";
    String unit_sdn_uri "https://vocab.nerc.ac.uk/collection/P06/current/DEGN/";
    String unit_sdn_urn "SDN:P06::DEGN";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 15.4, 15.4;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String ioos_category "Location";
    String long_name "longitude of measurement";
    String parameter_sdn_name "Longitude east";
    String parameter_sdn_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALONZZ01/";
    String parameter_sdn_urn "SDN:P01::ALONZZ01";
    String standard_name "longitude";
    String unit_sdn_name "degree_east";
    String unit_sdn_uri "https://vocab.nerc.ac.uk/collection/P06/current/DEGE/";
    String unit_sdn_urn "SDN:P06::DEGE";
    String units "degrees_east";
  }
  spl {
    Float32 actual_range 74.88763, 133.0037;
    String ancillary_variables "spl_qc";
    String comment "Sound pressure level in 1/3 octave bands";
    String device_sdn_name "hydrophones";
    String device_sdn_uri "https://vocab.nerc.ac.uk/collection/L05/current/369/";
    String device_sdn_urn "SDN:L05::369";
    String discipline "Cross-discipline";
    String eov "Ocean sound";
    String eov_uri "https://goosocean.org/document/22567";
    String ioos_category "Pressure";
    String long_name "sound pressure level";
    String parameter_sdn_name "Sound pressure level of ambient noise in the water body";
    String parameter_sdn_uri "https://vocab.nerc.ac.uk/collection/P01/current/AMBNSPL1/";
    String parameter_sdn_urn "SDN:L22::TOOL0942";
    String sensor_accuracy "2 dB";
    String sensor_last_calibration "2021-01-21T00:00:00Z";
    String sensor_manufacturer_sdn_name "IC listen - Ocean Sonic";
    String sensor_sdn_name "SA35L-ETH";
    String standard_name "sound_pressure_level_in_water";
    String unit_sdn_name "Decibels";
    String unit_sdn_uri "https://vocab.nerc.ac.uk/collection/P06/current/UDBL/";
    String unit_sdn_urn "SDN:P06::UDBL";
    String units "dB relative to 1 micropascal";
    String units_url "https://docs.unidata.ucar.edu/udunits/current/udunits2-derived.xml";
  }
  spl_qc {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 9, 9;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    String flag_values "0,1,2,3,4,7,8,9";
    String long_name "spl data quality flag";
    String qc_manual "https://repository.oceanbestpractices.org/bitstream/handle/11329/874.2/oceansites_data_format_reference_manual.pdf";
    String qc_method "https://repository.oceanbestpractices.org/bitstream/handle/11329/874.2/oceansites_data_format_reference_manual.pdf";
    String standard_name "quality_flag";
  }
  station_id {
    String cf_role "timeseries_id";
    String long_name "Station Identifier";
    String standard_name "platform_id";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.704070801024e+9, 1.710745497984e+9;
    String axis "T";
    String calendar "gregorian";
    String ioos_category "Time";
    String long_name "time of measurement";
    String parameter_sdn_name "Elapsed time relative to 1970-01-01T00:00:00Z";
    String parameter_sdn_uri "https://vocab.nerc.ac.uk/collection/P01/current/ELTMEP01/";
    String parameter_sdn_urn "SDN:P01::ELTMEP01";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String unit_sdn_name "Seconds";
    String unit_sdn_uri "https://vocab.nerc.ac.uk/collection/P06/current/UTBB/";
    String unit_sdn_urn "SDN:P06::UTBB";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
 }
  NC_GLOBAL {
    String acknowledgement "Funded by EU - Next Generation EU PNRR IR00000032 ITINERIS, Italian Integrated Environmental Research Infrastructures System";
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id, longitude, latitude, depth";
    String Conventions "CF-1.10, COARDS, ACDD-1.3";
    String creator_name "Giuditta Marinaro, Davide Embriaco";
    String creator_type "institution";
    String creator_url "https://www.ingv.it";
    String data_creation "2026-02-06";
    String data_format_original "WAV";
    String data_type "NRT";
    String data_update "2026-02-06";
    String data_update_frequence "daily";
    String data_version "1.0";
    Float64 Easternmost_Easting 15.4;
    String featureType "TimeSeries";
    Float64 geospatial_lat_max 37.55;
    Float64 geospatial_lat_min 37.55;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 15.4;
    Float64 geospatial_lon_min 15.4;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 2035.0;
    Float64 geospatial_vertical_min 2035.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"Acoustic data from hydrophone on cabled observator
2026-02-24T21:49:00Z (local files)
2026-02-24T21:49:00Z https://erddap.moist.it/tabledap/EMSO_WIS_HYDRO_LFH_SPL.das";
    String infoUrl "https://www.itineris.cnr.it";
    String institution "Istituto Nazionale di Geofisica e Vulcanologia";
    String keywords "acoustic, acoustics, attenuation, data, depth, earth, earth remote sensing instruments, Earth Science > Oceans > Ocean Acoustics > Acoustic Attenuation/Transmission, flag, frequency, geofisica, identifier, istituto, latitude, level, longitude, measurement, nazionale, ocean, oceans, passive remote sensing (4f81c61c-f100-4bc4-9664-d9b70d2f162f), platform, platform_id, pressure, quality, quality_flag, science, sound, sound_pressure_level_in_water, spl, spl_qc, station, station_id, time, transmission, vulcanologia, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "Creative Commons Attribution 4.0";
    String license_url "https://creativecommons.org/licenses/by/4.0/legalcode";
    String naming_authority "Istituto Nazionale di Geofisica e Vulcanologia";
    Float64 Northernmost_Northing 37.55;
    String platform_name "Calipso";
    String platform_organization_managing "Istituto Nazionale di Geofisica e Vulcanologia";
    String platform_organization_owning "Istituto Nazionale di Geofisica e Vulcanologia";
    String platform_reference_person "Francesco Simeone";
    String project_code "PON InSea";
    String project_name "PON InSea";
    String references "https://doi.org/10.3390/jmse13030454";
    String ri_geographical_coverage "Western Ionian Sea";
    String ri_name "Italian Ocean Sound (subsystem)";
    String ri_national_coordin_organization "Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali del Sud";
    String ri_national_coordin_organization_edmo_code "6211";
    String ri_national_coordin_organization_edmo_uri "https://edmo.seadatanet.org/report/6211";
    String ri_national_coordinating_person "Giorgio Riccobene";
    String ri_short_name "IT-OSS";
    String ri_start_date "2023-12-23";
    String source "Acoustic data from hydrophone on cabled observator";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 37.55;
    String standard_name_vocabulary "CF Standard Name Table v72";
    String subsetVariables "station_id";
    String summary "Hydrophone SPL data from fixed acoustic monitoring";
    String time_coverage_duration "P6M";
    String time_coverage_end "2024-03-18T07:04:57Z";
    String time_coverage_start "2024-01-01T01:00:01Z";
    String title "INSEA Calipso hydrophone SPL data";
    Float64 Westernmost_Easting 15.4;
  }
}

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its selection 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.

(easy) You can get data by using the dataset's Data Access Form or Subset form. They make the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.

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