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Dataset Title:	WCO - L4 CTD Data
Institution:	Plymouth Marine Laboratory (Dataset ID: L4_6eaa_6254_2678)
Range:	longitude = -4.38115 to 1.63837°E, latitude = -19.61517 to 52.22815°N, depth = 0.25 to 56.5m, time = 2002-01-07T12:00:00.000Z to 2025-11-25T09:59:14.000Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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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 {
  Cruise {
    String ioos_category "Unknown";
    String long_name "Cruise";
  }
  Station {
    String ioos_category "Identifier";
    String long_name "Station";
  }
  Type {
    String ioos_category "Unknown";
    String long_name "Type";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.0104048e+9, 1.764064754e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Date (UTC)";
    String source_name "DateTime";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00.000Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -19.61517, 52.22815;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -4.38115, 1.63837;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float32 actual_range 0.25, 56.5;
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  Temperature {
    Float32 actual_range -9.999, 19.9001;
    String ioos_category "Temperature";
    String long_name "Temperature";
    String units "degC";
  }
  Transmission {
    Float32 _FillValue NaN;
    Float32 actual_range -999.0, 100.2334;
    String ioos_category "Optical Properties";
    String long_name "Transmission";
    String units "%";
  }
  PAR {
    Float32 _FillValue NaN;
    Float32 actual_range -999.0, 6170.3;
    Float64 colorBarMaximum 70.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Optical Properties";
    String long_name "Downwelling Photosynthetic Photon Radiance In Sea Water";
    String standard_name "downwelling_photosynthetic_photon_radiance_in_sea_water";
    String units "uE/m2/s";
  }
  Fluorescence {
    Float32 _FillValue NaN;
    Float32 actual_range -999.0, 389.1985;
    String ioos_category "Optical Properties";
    String long_name "Fluorescence";
    String units "volts";
  }
  Density {
    Float64 actual_range -400.4028, 1066.2969;
    String ioos_category "Physical Oceanography";
    String long_name "Density";
    String units "kg/m3";
  }
  Oxygen {
    Float32 _FillValue NaN;
    Float32 actual_range -999.0, 612.265;
    String ioos_category "Dissolved O2";
    String long_name "Oxygen";
    String units "uM";
  }
  Salinity {
    Float32 actual_range -13.6223, 36.2767;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String ioos_category "Salinity";
    String long_name "Sea Water Practical Salinity";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
  Turbidity {
    Float32 _FillValue NaN;
    Float32 actual_range -999.0, 197.2547;
    String ioos_category "Unknown";
    String long_name "Turbidity";
    String units "NTU";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "Plymouth Marine Laboratory";
    String creator_url "https://www.westernchannelobservatory.org.uk/l4_ctdf/index.php";
    Float64 Easternmost_Easting 1.63837;
    Float64 geospatial_lat_max 52.22815;
    Float64 geospatial_lat_min -19.61517;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 1.63837;
    Float64 geospatial_lon_min -4.38115;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 56.5;
    Float64 geospatial_vertical_min 0.25;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2025-12-06T04:33:49Z (local files)
2025-12-06T04:33:49Z https://erddap.eofrom.space/tabledap/L4_6eaa_6254_2678.das";
    String infoUrl "https://www.westernchannelobservatory.org.uk/l4_ctdf/index.php";
    String institution "Plymouth Marine Laboratory";
    String keywords "active, available, conductivity, cruise, ctd, data, date, DateTime, density, depth, dissolved, dissolved o2, downwelling, downwelling_photosynthetic_photon_radiance_in_sea_water, earth, Earth Science > Oceans > Ocean Optics > Photosynthetically Active Radiation, Earth Science > Oceans > Ocean Optics > Radiance, Earth Science > Oceans > Salinity/Density > Salinity, fluorescence, identifier, L4, laboratory, latitude, longitude, marine, O2, ocean, oceanography, oceans, optical, optical properties, optics, oxygen, par, photon, photosynthetic, photosynthetically, physical, physical oceanography, plymouth, practical, properties, radiance, radiation, salinity, science, sea, sea_water_practical_salinity, seawater, sonde, station, temperature, time, transmission, turbidity, type, water, wco";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "OGL - https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/";
    Float64 Northernmost_Northing 52.22815;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -19.61517;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "Cruise, Station, Type";
    String summary "WCO - L4 Conductivity, Temperature, Depth (CTD). These data are collected using sensors attached to our sampling rosette, by the R/V Plymouth Quest, at station L4 which is located 7 nautical miles south-south-west of Plymouth. The sensors include a SeaBird SBE 19+, a transmissometer, a Chelsea Photosynthetically Available Radiation (PAR) sensor, a fluorometer and an oxygen optode.";
    String time_coverage_end "2025-11-25T09:59:14.000Z";
    String time_coverage_start "2002-01-07T12:00:00.000Z";
    String title "WCO - L4 CTD Data";
    Float64 Westernmost_Easting -4.38115;
  }
}

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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