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Dataset Title:	Marmara Sea SN4 2009 Oxygen meter data
Institution:	Istituto Nazionale Geofisica e Vulcanologia - Sez. Roma2 (Dataset ID: MARMARA-DM_Oxygen)
Range:	longitude = 29.39883 to 29.39883°E, latitude = 40.72909 to 40.72909°N, depth = 166.2 to 166.2m, time = 2009-10-05T00:02:00Z to 2010-03-15T00:13:59Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.25470092e+9, 1.268612039e+9;
    String ancillary_variables "TIME_QC";
    String axis "T";
    String cf_role "timeseries_id";
    String ioos_category "Time";
    String long_name "time of measurements";
    String sdn_P02_urn "SDN:P02::AYMD";
    String sdn_parameter_name "Elapsed time relative to 1970-01-01T00:00:00Z";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ELTMEP01/";
    String sdn_parameter_urn "SDN:P01::ELTMEP01";
    String sdn_uom_name "Seconds";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UTBB/";
    String sdn_uom_urn "SDN:P06::UTBB";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float32 actual_range 166.2, 166.2;
    String ancillary_variables "DEPTH_QC";
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String ioos_category "Location";
    String long_name "depth of measurements";
    String positive "down";
    String sdn_P02_urn "SDN:P02::AHGT";
    String sdn_parameter_name "Depth (spatial coordinate) relative to water surface in the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ADEPZZ01/";
    String sdn_parameter_urn "SDN:P01::ADEPZZ01";
    String sdn_uom_name "Meters";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/ULAA/";
    String sdn_uom_urn "SDN:P06::ULAA";
    String standard_name "depth";
    String units "m";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 29.39883, 29.39883;
    String ancillary_variables "POSITION_QC";
    String axis "X";
    String ioos_category "Location";
    String long_name "longitude of measurements";
    String sdn_P02_urn "SDN:P02::ALAT";
    String sdn_parameter_name "Longitude east";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALONZZ01/";
    String sdn_parameter_urn "SDN:P01::ALONZZ01";
    String sdn_uom_name "Degrees east";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/DEGE/";
    String sdn_uom_urn "SDN:P06::DEGE";
    String standard_name "longitude";
    String units "degrees_east";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 40.72909, 40.72909;
    String ancillary_variables "POSITION_QC";
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "latitude of measurements";
    String sdn_P02_urn "SDN:P02::ALAT";
    String sdn_parameter_name "Latitude north";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALATZZ01/";
    String sdn_parameter_urn "SDN:P01::ALATZZ01";
    String sdn_uom_name "Degrees north";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/DEGN/";
    String sdn_uom_urn "SDN:P06::DEGN";
    String standard_name "latitude";
    String units "degrees_north";
  }
  OXY_CON {
    Float32 _FillValue -999.0;
    Float32 actual_range 5.06, 103.1;
    String ancillary_variables "OXY_CON_QC";
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Concentration of dissolved oxygen per unit volume of the water body";
    String sdn_P02_urn "SDN:P02::DOXY";
    String sdn_parameter_name "Concentration of oxygen per unit volume of the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/DOXYZZXX";
    String sdn_parameter_urn "SDN:P01::DOXYZZXX";
    String sdn_uom_name "Micromoles per litre";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPOX/";
    String sdn_uom_urn "SDN:P06::UPOX";
    String sensor_manufacturer "Aanderaa";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0007/";
    String sensor_manufacturer_urn "SDN:L35::MAN0007";
    String sensor_model "AA Optode 3830";
    String sensor_mount "mounted_on_seafloor_structure";
    String sensor_orientation "horizontal";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0836/";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL0836";
    String sensor_serial_number "762";
    String sensor_type_name "dissolved gas sensors";
    String sensor_type_uri "https://vocab.nerc.ac.uk/collection/L05/current/351/";
    String standard_name "volume_fraction_of_oxygen_in_sea_water";
    String units "Micromoles per litre";
  }
  OXY_SAT {
    Float32 _FillValue -999.0;
    Float32 actual_range 1.59, 33.44;
    String ancillary_variables "OXY_SAT_QC";
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Concentration of dissolved oxygen per unit volume of the water body";
    String sdn_P02_urn "SDN:P02::DOXY";
    String sdn_parameter_name "Saturation of oxygen {O2 CAS 7782-44-7} in the water body [dissolved plus reactive particulate phase]";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/OXYSZZ01";
    String sdn_parameter_urn "SDN:P01::OXYSZZ01";
    String sdn_uom_name "Percent";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPCT/";
    String sdn_uom_urn "SDN:P06::UPCT";
    String sensor_manufacturer "Aanderaa";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0007/";
    String sensor_manufacturer_urn "SDN:L35::MAN0007";
    String sensor_model "AA Optode 3830";
    String sensor_mount "mounted_on_seafloor_structure";
    String sensor_orientation "horizontal";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0836/";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL0836";
    String sensor_serial_number "762";
    String sensor_type_name "dissolved gas sensors";
    String sensor_type_uri "https://vocab.nerc.ac.uk/collection/L05/current/351/";
    String standard_name "volume_fraction_of_oxygen_in_sea_water";
    String units "Percent";
  }
  TEMP {
    Float32 _FillValue -999.0;
    Float32 actual_range 14.48, 15.94;
    String ancillary_variables "TEMP_QC";
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String long_name "temperature";
    String sdn_P02_urn "SDN:P02::TEMP";
    String sdn_parameter_name "Temperature of the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/TEMPPR01/";
    String sdn_parameter_urn "SDN:P01::TEMPPR01";
    String sdn_uom_name "Degrees Celsius";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPAA/";
    String sdn_uom_urn "SDN:P06::UPAA";
    String sensor_manufacturer "Aanderaa";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0007/";
    String sensor_manufacturer_urn "SDN:L35::MAN0007";
    String sensor_model "AA Optode 3830";
    String sensor_mount "mounted_on_seafloor_structure";
    String sensor_orientation "horizontal";
    String sensor_reference "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0836/";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL0836";
    String sensor_serial_number "762";
    String sensor_type_name "dissolved gas sensors";
    String sensor_type_uri "https://vocab.nerc.ac.uk/collection/L05/current/351/";
    String standard_name "sea_water_temperature";
    String units "degree_C";
  }
  TIME_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 1;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String conventions "OceanSITES QC Flags";
    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 "TIME quality control flags";
  }
  DEPTH_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 1;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String conventions "OceanSITES QC Flags";
    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 "DEPTH quality control flags";
    String standard_name "depth";
  }
  POSITION_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 1;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String conventions "OceanSITES QC Flags";
    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 "POSITION quality control flags";
  }
  OXY_CON_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String conventions "OceanSITES QC Flags";
    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 "OXY quality control flags";
  }
  OXY_SAT_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String conventions "OceanSITES QC Flags";
    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 "OXY quality control flags";
  }
  TEMP_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Byte actual_range 1, 9;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String conventions "OceanSITES QC Flags";
    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 "TEMP quality control flags";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "depth,latitude,longitude,time";
    String Conventions "OceanSITES-1.5,SeaDataNet_1.0,COARDS, CF-1.6, ACDD-1.3";
    String creator_name "Istituto Nazionale Geofisica e Vulcanologia - Sez. Roma2";
    String creator_url "moist.it";
    String data_mode "D";
    String data_type "OceanSITES time-series data";
    String date_created "2025-11-18T13:04:52Z";
    Float64 Easternmost_Easting 29.39883;
    String emso_facility "Marmara Sea";
    String featureType "TimeSeries";
    String format_version "1.5";
    Float64 geospatial_lat_max 40.72909;
    Float64 geospatial_lat_min 40.72909;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 29.39883;
    Float64 geospatial_lon_min 29.39883;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 166.2;
    Float64 geospatial_vertical_min 166.2;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"fixed benthic node
2025-11-18T16:35:36Z (local files)
2025-11-18T16:35:36Z http://oceano.bo.ingv.it/tabledap/MARMARA-DM_Oxygen.das";
    String info_url "http://www.moist.it/sites/marmara_sea/8/MARMARADM/oxygen_meter/30/qc";
    String infoUrl "moist.it";
    String institution "Istituto Nazionale Geofisica e Vulcanologia - Sez. Roma2";
    String institution_edmo_code "3917";
    String institution_edmo_uri "https://edmo.seadatanet.org/report/3917";
    String institution_ror_uri "https://ror.org/00qps9a02";
    String keywords "body, chemistry, concentration, control, data, depth, DEPTH_QC, dissolved, earth, Earth Science > Oceans > Marine Sediments > Turbidity, Earth Science > Oceans > Ocean Chemistry > Oxygen, Earth Science > Oceans > Ocean Temperature > Water Temperature, flags, fraction, geofisica, istituto, latitude, longitude, MACMAP, marine, marmara, meter, nazionale, O2, ocean, oceans, oxy, OXY_CON, OXY_CON_QC, OXY_SAT, OXY_SAT_QC, oxygen, per, position, POSITION_QC, quality, roma2, science, sea, sea_water_temperature, seawater, sediments, sez, sn4, TEMP, TEMP_QC, temperature, time, TIME_QC, turbidity, unit, volume, volume_fraction_of_oxygen_in_sea_water, vulcanologia, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "CC-BY-4.0";
    String license_uri "https://spdx.org/licenses/CC-BY-4.0.json";
    Float64 Northernmost_Northing 40.72909;
    String principal_investigator "Beatrice Giambenedetti";
    String principal_investigator_email "beatrice.giambenedetti at ingv.it";
    String project "ESONET-MARMARA-DM";
    String site_code "SN-4";
    String source "fixed benthic node";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 40.72909;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "depth, longitude, latitude, TIME_QC, DEPTH_QC, POSITION_QC";
    String summary "The Optode sensor measures the dissolved oxygen concentration in sea water using a lifetime-based luminescence quenching principle. The dataset includes a measured device temperature channel and the oxygen saturation values [%] computed from concentration and temperature.";
    String time_coverage_end "2010-03-15T00:13:59Z";
    String time_coverage_start "2009-10-05T00:02:00Z";
    String title "Marmara Sea SN4 2009 Oxygen meter data";
    String update_interval "void";
    Float64 Westernmost_Easting 29.39883;
  }
}

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.