BCO-DMO ERDDAP
Accessing BCO-DMO data

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Dataset Title:	[CTD and in situ Sonde Lake Superior and Lake Erie 2021-2024] - CTD and in situ Sonde field data collected on Lake Superior and Lake Erie aboard the R/V Blue Heron and R/V Gibraltar III from May 2021 to May 2024 (Collaborative Research: Cyanobacteria, Nitrogen Cycling, and Export Production in the Laurentian Great Lakes)
Institution:	BCO-DMO (Dataset ID: bcodmo_dataset_967649_v1)
Range:	longitude = -91.11304 to -81.63803°E, latitude = 41.63001 to 47.32494°N, depth = 0.0 to 181.0m, time = 2021-05-12T23:12:51Z to 2023-10-11T01:02:20Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| 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 {
  Year_Month {
    String long_name "Year_month";
    String units "unitless";
  }
  Date {
    String long_name "Date";
    String units "unitless";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.620861171e+9, 1.69698614e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Iso_datetime_utc";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  Lake {
    String long_name "Lake";
    String units "unitless";
  }
  Site {
    String long_name "Site";
    String units "unitless";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 41.63001, 47.32494;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -91.11304, -81.63803;
    String axis "X";
    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 0.0, 181.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  Pressure_Digiquartz {
    Float32 actual_range 0.976, 177.471;
    String long_name "Pressure_digiquartz";
    String units "Decible (db)";
  }
  Temperature {
    Float32 actual_range -0.2448, 26.5404;
    String long_name "Temperature";
    String units "Degrees C";
  }
  Conductivity {
    Float32 actual_range 55.11934, 268.9439;
    String long_name "Conductivity";
    String units "MicroSiemens per centimeter (µS/cm)";
  }
  Specific_Conductance {
    Float32 actual_range 99.822, 288.058;
    String long_name "Specific_conductance";
    String units "MicroSiemens per centimeter (µS/cm)";
  }
  Salinity_Practical {
    Float32 actual_range 0.0432, 8.17;
    String long_name "Salinity_practical";
    String units "Practical Salinity Unit (PSU)";
  }
  Fluorescence_WET_Labs_WETstar {
    Float32 actual_range -0.2878, 3.8599;
    String long_name "Fluorescence_wet_labs_wetstar";
    String units "Milligram per meter cubed (mg/m3)";
  }
  Oxygen_SBE_43_mg_l {
    Float32 actual_range -2.9464, 1287.412;
    String long_name "Oxygen_sbe_43_mg_l";
    String units "Milligram per liter (mg/L)";
  }
  Oxygen_SBE_43_pct_saturation {
    Float32 actual_range -856.222, 124.8;
    String long_name "Oxygen_sbe_43_pct_saturation";
    String units "Percent (%)";
  }
  Fluorescence_WET_Labs_CDOM {
    Float32 actual_range -0.4216, 2.0049;
    String long_name "Fluorescence_wet_labs_cdom";
    String units "Milligram per meter cubed (mg/m3)";
  }
  Beam_Transmission_WET_Labs_C_Star {
    Float32 actual_range 51.6473, 97.216;
    String long_name "Beam_transmission_wet_labs_c_star";
    String units "Percent (%)";
  }
  PAR_Irradiance_Biospherical_Licor {
    Float32 actual_range -3.1e-4, 4180.0;
    String long_name "Par_irradiance_biospherical_licor";
    String units "µEinsteins/m2/s";
  }
  Oxidation_Reduction_Potential {
    Float32 actual_range 190.7566, 340.0057;
    String long_name "Oxidation_reduction_potential";
    String units "Millivolts (mV)";
  }
  pH {
    Float32 actual_range 6.825, 13.77;
    String long_name "Ph";
    String units "pH scale";
  }
  Descent_Rate {
    Float32 actual_range -0.238, 0.957;
    String long_name "Descent_rate";
    String units "Meters per second (m/s)";
  }
  Time_Elapsed {
    Float32 actual_range -0.574, 517.492;
    String long_name "Time_elapsed";
    String units "Seconds (s)";
  }
  Altimeter {
    Float32 actual_range -20.42, 103.71;
    String long_name "Altimeter";
    String units "Meters (m)";
  }
  Flag {
    String long_name "Flag";
    String units "unitless";
  }
  Chlorophyll_a_ug_L {
    Float32 actual_range 0.07, 18.62;
    String long_name "Chlorophyll_a_ug_l";
    String units "micrograms per liter (ug/L)";
  }
  Chlorophyll_a_RFU {
    Float32 actual_range 0.05, 10.2;
    String long_name "Chlorophyll_a_rfu";
    String units "Relative Fluorescence Units (RFU)";
  }
  Pressure_PSI {
    Float32 actual_range 1.35, 25.56;
    String long_name "Pressure_psi";
    String units "PSI";
  }
  Turbidity {
    Float32 actual_range -0.43, 16.73;
    String long_name "Turbidity";
    String units "Nephelometric Turbidity Unit (NTU)";
  }
  Phyco_RFU {
    Float32 actual_range 0.08, 0.6;
    String long_name "Phyco_rfu";
    String units "Relative Fluorescence Units (RFU)";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_url "https://www.bco-dmo.org/";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.26008/1912/bco-dmo.967649.1";
    Float64 Easternmost_Easting -81.63803;
    Float64 geospatial_lat_max 47.32494;
    Float64 geospatial_lat_min 41.63001;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -81.63803;
    Float64 geospatial_lon_min -91.11304;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 181.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2026-01-07T06:23:11Z (local files)
2026-01-07T06:23:11Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_967649_v1.das";
    String infoUrl "https://osprey.bco-dmo.org/dataset/967649";
    String institution "BCO-DMO";
    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
Contributor, ERD, 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.";
    Float64 Northernmost_Northing 47.32494;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 41.63001;
    String summary "This dataset includes the CTD and Sonde data from 11 cruises on Lake Superior aboard the University of Minnesota Duluth R/V Blue Heron from May 2021 to May 2024 (May, July, August, and October), as well as 11 cruises on Lake Erie (May, July, August, and October). The data are from five stations (two on Lake Superior; Siskiwit Bay and Western Mooring, and three on Lake Erie; Central Anoxic Basin, Lorain, and North Bass). This project is led by PIs Joe Werne at University of Pittsburgh, Silvia Newell at University of Michigan, Emily Elliott at University of Pittsburgh, Trinity Hamilton at University of Minnesota, and Richard Ricketts at University of Minnesota Duluth, and was funded by NSF Chemical Oceanography.";
    String time_coverage_end "2023-10-11T01:02:20Z";
    String time_coverage_start "2021-05-12T23:12:51Z";
    String title "[CTD and in situ Sonde Lake Superior and Lake Erie 2021-2024] - CTD and in situ Sonde field data collected on Lake Superior and Lake Erie aboard the R/V Blue Heron and R/V Gibraltar III from May 2021 to May 2024 (Collaborative Research: Cyanobacteria, Nitrogen Cycling, and Export Production in the Laurentian Great Lakes)";
    Float64 Westernmost_Easting -91.11304;
  }
}

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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