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Dataset Title:	SPL data from a Naxys hydrophone at OBSEA (30min average)
Institution:	Universitat Politècnica de Catalunya (Dataset ID: OBSEA_NAXYS_SPL_hydrophone_30min)
Range:	time = 2020-04-06T21:30:00Z to 2024-05-16T13:00:00Z
Information:	Summary \| License \| Metadata \| Background \| Data Access Form \| Files

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Constraints	Optional Constraint #1		Optional Constraint #2

Server-side Functions

distinct()

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Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.5862086e+9, 1.7158644e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Date/Time";
    String source_name "Date/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";
  }
  SPL_2000 {
    Float64 actual_range 71.6607, 120.9022;
    String long_name "sound_pressure_level_2000Hz_10s";
    String sdn_parameter "https://vocab.nerc.ac.uk/collection/P01/current/AMBNSP34";
    String sdn_parameter_urn "SDN:P01::AMBNSP34";
    String sdn_units "https://vocab.nerc.ac.uk/collection/P06/current/UDBL";
    String sdn_units_urn "SDN:P06::UDBL";
    String standard_name "sound_pressure_level_2000hz_10s";
    String units "dB re 1 uPa";
  }
  SPL_2000_qc {
    Int32 actual_range 1, 1;
    String long_name "SPL_2000 quality control flag";
  }
  SPL_125 {
    Float64 actual_range 69.77, 127.68;
    String long_name "sound_pressure_level_63Hz_10s";
    String sdn_parameter "https://vocab.nerc.ac.uk/collection/P01/current/AMBNSP22";
    String sdn_parameter_urn "SDN:P01::AMBNSP22";
    String sdn_units "https://vocab.nerc.ac.uk/collection/P06/current/UDBL";
    String sdn_units_urn "SDN:P06::UDBL";
    String standard_name "sound_pressure_level_63hz_10s";
    String units "dB re 1 uPa";
  }
  SPL_125_qc {
    Int32 actual_range 1, 1;
    String long_name "SPL_125 quality control flag";
  }
  SPL_63 {
    Float64 actual_range 69.72, 120.61;
    String long_name "sound_pressure_level_63Hz_10s";
    String sdn_parameter "https://vocab.nerc.ac.uk/collection/P01/current/AMBNSP19";
    String sdn_parameter_urn "SDN:P01::AMBNSP19";
    String sdn_units "https://vocab.nerc.ac.uk/collection/P06/current/UDBL";
    String sdn_units_urn "SDN:P06::UDBL";
    String standard_name "sound_pressure_level_63hz_10s";
    String units "dB re 1 uPa";
  }
  SPL_63_qc {
    Int32 actual_range 1, 1;
    String long_name "SPL_63 quality control flag";
  }
  SPL_all {
    Float64 actual_range 95.3082, 144.8206;
    String long_name "sound_pressure_level_full_bw_10s";
    String sdn_parameter "https://vocab.nerc.ac.uk/collection/P01/current/AMBNSPL1";
    String sdn_parameter_urn "SDN:P01::AMBNSPL1";
    String sdn_units "https://vocab.nerc.ac.uk/collection/P06/current/UDBL";
    String sdn_units_urn "SDN:P06::UDBL";
    String standard_name "sound_pressure_level_full_bw_10s";
    String units "dB re 1 uPa";
  }
  SPL_all_qc {
    Int32 actual_range 1, 1;
    String long_name "SPL_all quality control flag";
  }
 }
  NC_GLOBAL {
    String area "NW Mediterranean Sea";
    String author "Enoc Martinez";
    String average_period "30min";
    String cdm_data_type "Other";
    String contact "enoc.martinez@upc.edu";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String geospatial_lat_max "41.18212";
    String geospatial_lat_min "41.18212";
    String geospatial_lon_max "1.75257";
    String geospatial_lon_min "1.75257";
    String history 
"2024-07-27T04:24:24Z (local files)
2024-07-27T04:24:24Z https://data.obsea.es/tabledap/OBSEA_NAXYS_SPL_hydrophone_30min.das";
    String infoUrl "https://www.obsea.es";
    String institution "Universitat Politècnica de Catalunya";
    String institution_edmo_code "2150";
    String institution_references "https://www.obsea.es";
    String instrument_model "NAXYS Ethernet Hydrophone 02345";
    String license "Creative Commons Attribution 4.0 International (CC-BY-4.0)";
    String pi_name "Joaquín del Río";
    String platform_code "OBSEA";
    String processing_level 
"data acquired from sensor, SPL levels calculated in real-time, quality control
                procedure applied following QARTOD guidelines, data averaged in periods of 30min";
    String quality_control_flags 
"1:good data, 2:QC not applied, 3:suspicious data, 4:bad data, 9:missing
                data";
    String quality_control_methods "QARTOD, https://ioos.noaa.gov/project/qartod";
    String sdn_instrument_type "SDN:L05::369";
    String sdn_instrument_urn "SDN:L22::TOOL1593";
    String sensor_depth "20";
    String site_code "OBSEA";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary 
"Sound Pressure Level (ambient noise) from hydrophone data collected at OBSEA by a Naxys
                Ethernet 02345 Hydrophone and processed in real-time using the SWE Bridge software, 30min average";
    String testOutOfDate "now-1day";
    String time_coverage_end "2024-05-16T13:00:00Z";
    String time_coverage_start "2020-04-06T21:30:00Z";
    String title "SPL data from a Naxys hydrophone at OBSEA (30min average)";
  }
}

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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