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Dataset Title:	Albano Lake physico-chemical parameters
Institution:	Istituto Nazionale di Geofisica e Vulcanologia, Sede di Bologna (INGV) (Dataset ID: ALBANO_OBS_PHYSICO_CHEMICAL)
Range:	longitude = 12.65184 to 12.68285°E, latitude = 41.73728 to 41.75827°N, time = 2022-08-30T12:03:04Z to 2022-09-01T13:56:47Z
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 {
  trajectory_id {
    Int32 actual_range 1, 1;
    String cf_role "trajectory_id";
    String long_name "Trajectory";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.661860984e+9, 1.662040607e+9;
    String ancillary_variables "TIME_QC";
    String axis "T";
    String calendar "proleptic_gregorian";
    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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 _FillValue NaN;
    Float32 actual_range 41.73728, 41.75827;
    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";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 _FillValue NaN;
    Float32 actual_range 12.65184, 12.68285;
    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";
  }
  TEMP {
    Float32 _FillValue -999.0;
    Float32 actual_range 11.48, 29.06;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Water temperature";
    Float32 missing_value -999.0;
    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 standard_name "sea_water_temperature";
    String units "degree_C";
  }
  ALKY {
    Float32 _FillValue -999.0;
    Float32 actual_range 8.07, 9.09;
    Float64 colorBarMaximum 9.0;
    Float64 colorBarMinimum 7.0;
    String long_name "water ph";
    Float32 missing_value -999.0;
    String sdn_P02_urn "SDN:P02::ALKY";
    String sdn_parameter_name "pH (unspecified scale) of the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/PHXXZZXX";
    String sdn_parameter_urn "SDN:P01::PHXXZZXX";
    String sdn_uom_name "ph units";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UUPH/";
    String sdn_uom_urn "SDN:P06::UUPH";
    String standard_name "sea_water_ph_reported_on_total_scale";
    String units "ph units";
  }
  EH {
    Float32 _FillValue -999.0;
    Float32 actual_range -113.2, -51.4;
    String long_name "Redox potential";
    Float32 missing_value -999.0;
    String sdn_P02_urn "SDN:P02::WBRX";
    String sdn_parameter_name "Redox potential in the water body by redox electrode and no reference electrode correction";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/RPTWBZZ1";
    String sdn_parameter_urn "SDN:P01::RPTWBZZ1";
    String sdn_uom_name "Millivolts";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UUMV/";
    String sdn_uom_urn "SDN:P06::UUMV";
    String units "Millivolts";
  }
  CNDC {
    Float32 _FillValue -999.0;
    Float32 actual_range 206.0, 466.0;
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 30.0;
    String long_name "conductivity";
    Float32 missing_value -999.0;
    String sdn_P02_urn "SDN:P02::CNDC";
    String sdn_parameter_name "Electrical conductivity of the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/CNDCZZ01";
    String sdn_parameter_urn "SDN:P01::CNDCZZ01";
    String sdn_uom_name "MicroSiemens per centimetre";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/USCM/";
    String sdn_uom_urn "SDN:P06::USCM";
    String standard_name "sea_water_electrical_conductivity";
    String units "mS/cm or mS cm-1";
  }
  TDS {
    Float32 _FillValue -999.0;
    Float32 actual_range 103.0, 233.0;
    String long_name "Total Dissolved Solids";
    Float32 missing_value -999.0;
    String sdn_P02_urn "SDN:P02::TSED";
    String sdn_parameter_name "Concentration of solids (total dissolved) {TDS} per unit volume of the water body [dissolved plus reactive particulate <1.5um phase]";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/RBYJLY27";
    String sdn_parameter_urn "SDN:P01::RBYJLY27";
    String sdn_uom_name "Parts per million";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPPM/";
    String sdn_uom_urn "SDN:P06::UPPM";
    String units "ppm";
  }
  PRES {
    Float32 _FillValue -999.0;
    Float32 actual_range 9.791938, 9.90846;
    String ancillary_variables "PRES_QC";
    Float64 colorBarMaximum 5000.0;
    Float64 colorBarMinimum 0.0;
    String long_name "pressure";
    Float32 missing_value -999.0;
    String sdn_P02_urn "SDN:P02::ASLV";
    String sdn_parameter_name "Pressure (measured variable) exerted by the water body plus atmosphere by fixed in-situ pressure sensor";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/PRSTPS01/";
    String sdn_parameter_urn "SDN:P01::PRSTPS01";
    String sdn_uom_name "Decibars";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPDB/";
    String sdn_uom_urn "SDN:P06::UPDB";
    String standard_name "sea_water_pressure";
    String units "decibar";
  }
  DO1 {
    Float32 _FillValue -999.0;
    Float32 actual_range 33.2, 53.4;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Dissolved oxygen";
    Float32 missing_value -999.0;
    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 standard_name "volume_fraction_of_oxygen_in_sea_water";
    String units "Percent";
  }
  DO2 {
    Float32 _FillValue -999.0;
    Float32 actual_range 2.55, 5.37;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Dissolved oxygen";
    Float32 missing_value -999.0;
    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 "Parts per million";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPCT/";
    String sdn_uom_urn "SDN:P06::UPPM";
    String standard_name "volume_fraction_of_oxygen_in_sea_water";
    String units "ppm";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Trajectory";
    String cdm_trajectory_variables "trajectory_id";
    String citation "not yet available";
    String contributor_name "Dmitri Rouwet, Franco Tassi, Giancarlo Tamburello, Giovannella G. Pecoraino, Monia Procesi, Daniele Cinti, Jacopo Cabassi, Stefania Venturi, Tullio Ricci, Orlando Vaselli, Francesco Capecchiacci, Claudia Fratianni";
    String contributor_role "Data collector/Researcher,Researcher,Data collector/Researcher,Researcher,Researcher,Researcher,Researcher,Researcher,Researcher,Researcher,Researcher,Data Curator/Manager";
    String contributor_url "https://orcid.org/0000-0003-3366-3882, https://orcid.org/0000-0002-3319-4257, https://orcid.org/0000-0001-7770-5226, https://orcid.org/0000-0001-5478-1912, https://orcid.org/0000-0003-0029-5235, https://orcid.org/0000-0002-8995-3312, https://orcid.org/0000-0001-7778-8498, https://orcid.org/0000-0002-3043-928X, https://orcid.org/0000-0002-0553-5384, https://orcid.org/0000-0001-8121-4438, https://orcid.org/0000-0002-3058-1489,https://orcid.org/0000-0002-4983-4255";
    String Conventions "CF-1.7, SeaDataNet_1.0, ACDD-1.3, COARDS";
    String creator_name "Istituto Nazionale di Geofisica e Vulcanologia, Sede di Bologna";
    String creator_url "https://www.ingv.it";
    String data_mode "R";
    String doi "not yet available";
    Float64 Easternmost_Easting 12.68285;
    String feature_type "trajectory";
    String featureType "Trajectory";
    Float64 geospatial_lat_max 41.75827;
    Float64 geospatial_lat_min 41.73728;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 12.68285;
    Float64 geospatial_lon_min 12.65184;
    String geospatial_lon_units "degrees_east";
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"multiparametric probe measurements
2026-03-15T23:26:26Z (local files)
2026-03-15T23:26:26Z http://oceano.bo.ingv.it/tabledap/ALBANO_OBS_PHYSICO_CHEMICAL.das";
    String info_url "https://www.bo.ingv.it/ricerca-scientifica/ambiente/";
    String infoUrl "https://www.ingv.it";
    String institution "Istituto Nazionale di Geofisica e Vulcanologia, Sede di Bologna (INGV)";
    String institution_edmo_code "251";
    String institution_ror_uri "https://ror.org/029w2re51";
    String keywords "albano, ALKY, bologna, chemical, chemistry, CNDC, conductivity, data, density, dissolved, DO1, DO2, earth, Earth Science > Oceans > Ocean Chemistry > Oxygen, Earth Science > Oceans > Ocean Chemistry > pH, Earth Science > Oceans > Ocean Pressure > Water Pressure, Earth Science > Oceans > Ocean Temperature > Water Temperature, Earth Science > Oceans > Salinity/Density > Conductivity, electrical, fraction, geofisica, ingv, istituto, lake, latitude, longitude, nazionale, O2, ocean, oceans, oxygen, parameters, physico, physico-chemical, potential, PRES, pressure, redox, reported, salinity, scale, science, sea, sea_water_electrical_conductivity, sea_water_ph_reported_on_total_scale, sea_water_pressure, sea_water_temperature, seawater, sede, solids, TDS, TEMP, temperature, time, total, trajectory, trajectory_id, 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 41.75827;
    String project "Dipartimentale INGV MACMAP";
    String source "multiparametric probe measurements";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 41.73728;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "trajectory_id";
    String summary "Physico-chemical parameters (T, pH, Eh, EC, TDS, D.O., atmospheric pressure) measured by the Hanna Instrument HI9829 multiparametric probe at the surface of Lake Albano, Colli Albani volcano, Rome.";
    String time_coverage_end "2022-09-01T13:56:47Z";
    String time_coverage_start "2022-08-30T12:03:04Z";
    String title "Albano Lake physico-chemical parameters";
    Float64 Westernmost_Easting 12.65184;
  }
}

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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