Make A Graph

Dataset Title:	Underwater noise data at Cabo de Palos-Islas Hormigas marine reserve
Institution:	Centro Tecnologico Naval y del Mar (Murcia) (Dataset ID: CTN_UWN_CABODEPALOS_TS_HOURLY)
Range:	longitude = -0.592 to -0.592°E, latitude = 37.67 to 37.67°N, time = 2020-09-17T10:01:26Z to 2020-10-16T12:10:29Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| 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 1.600336886e+9, 1.602850229e+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 time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 37.67, 37.67;
    String axis "Y";
    String coordinate_reference_frame "urn:ogc:crs:EPSG::4326";
    String ioos_category "Location";
    String long_name "Latitude of the station, best estimate";
    String references "WGS84";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -0.592, -0.592;
    String axis "X";
    String coordinate_reference_frame "urn:ogc:crs:EPSG::4326";
    String ioos_category "Location";
    String long_name "Longitude of the station, best estimate";
    String references "WGS84";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Noise_Data_at_63_Hz {
    Float32 actual_range 85.083, 120.879;
    String long_name "noise data at 63 Hz";
  }
  Noise_Data_at_125_Hz {
    Float32 actual_range 88.162, 126.369;
    String long_name "noise data at 125 Hz";
  }
  mean_spectrum_10_Hz_10_kHz {
    Float32 actual_range 93.264, 118.012;
    String long_name "mean value of the spectrum from 10 Hz to 10 kHz";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_mail "martasanchez@ctnaval.com";
    String creator_name "Centro Tecnologico Naval y del Mar (Murcia)";
    String creator_url "http://www.ctnaval.com/";
    Float64 Easternmost_Easting -0.592;
    Float64 geospatial_lat_max 37.67;
    Float64 geospatial_lat_min 37.67;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -0.592;
    Float64 geospatial_lon_min -0.592;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-05-08T21:40:51Z (local files)
2024-05-08T21:40:51Z https://erddap.emodnet-physics.eu/tabledap/CTN_UWN_CABODEPALOS_TS_HOURLY.das";
    String infoUrl "http://www.ctnaval.com/";
    String institution "Centro Tecnologico Naval y del Mar (Murcia)";
    String keywords "noise, underwater";
    String Latitude "37º20' N - 38º N";
    String license "Creative Commons Attribution Share-Alike http://www.opendefinition.org/licenses/cc-by-sa";
    String Longitude "1º06' W - 0º05' W";
    Float64 Northernmost_Northing 37.67;
    String Observations "We would like to aknowledge: Reserva marina de interés pesquero de Cabo de Palos- Islas Hormigas, Dirección General de Pesca Sostenible- Secretaria General de Pesca- MAPA y Dirección General de Ganadería, Pesca y Acuicultura- Consejería de Agua, Agricultura y Medio Ambiente de la Región de Murcia.";
    String Project "Fundación Biodiversidad";
    String Sea_Areas "Western Mediterranean Sea";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 37.67;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Underwater noise data (Descriptor D11C2) at Cabo de Palos-Islas Hormigas marine reserve, recorded by AS1 of Aquarian Audio. Sound Pressure Level (SPL) centered in the 63 Hz band (SPL63), 125 Hz (SPL125) and the mean value of the spectrum from 10 Hz to 10 kHz (SPLmean) in 1/3 octave and integrated time interval of 1 minute. The dataset cover data from September to October 2020.";
    String Summary_of_processing_methodology "The dataset is obtained by direct continuous underwater noise pressure level measuremente using AS1 hydrophone. The measurement is performed in the frequency range of 10 Hz - 10 kHz in 1/3 octave, from which sound pressure level (SPL) of 63 Hz and 125 Hz along with the mean value of the bandwidth (10 Hz - 10 kHz) are extracted. The integrated time interval of the processing is 1 minute per audio.";
    String time_coverage_end "2020-10-16T12:10:29Z";
    String time_coverage_start "2020-09-17T10:01:26Z";
    String title "Underwater noise data at Cabo de Palos-Islas Hormigas marine reserve";
    Float64 Westernmost_Easting -0.592;
  }
}

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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