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Dataset Title:	Profile - R1.x132.134.0119 - GOM-Nothern-Gulf-CTD-CH4-All-42014-GC600 - 27. 37N, 90.57W - 2014-04-05
Institution:	University of North Carolina at Chapel Hill (Dataset ID: R1_x132_134_0119_GOM_Nothern_Gulf_CTD_CH4_All_42014_GC600)
Range:	longitude = -90.5713 to -90.5713°E, latitude = 27.3708 to 27.3708°N, depth = 0.694 to 1252.783m, time = 2014-04-05T06:10:00Z to 2014-04-10T10:26:00Z
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 {
  profile {
    Int16 _FillValue -999;
    String cf_role "profile_id";
    String ioos_category "Identifier";
    String long_name "GOM-Nothern-Gulf-CTD-CH4-All-42014-GC600";
    Int16 missing_value 32767;
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3966782e+9, 1.39712556e+9;
    String axis "T";
    String calendar "gregorian";
    Float64 colorBarMaximum 1.3972e+9;
    Float64 colorBarMinimum 1.3966e+9;
    String coverage_content_type "physicalMeasurement";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
    Float64 valid_max 1.39712556e+9;
    Float64 valid_min 1.3966782e+9;
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue -99999.0;
    Float64 actual_range 27.3708, 27.3708;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Latitude";
    Float64 missing_value -99999.0;
    String standard_name "latitude";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/latitude";
    String units "degrees_north";
    Float64 valid_max 27.3708;
    Float64 valid_min 27.3708;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue -99999.0;
    Float64 actual_range -90.5713, -90.5713;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String coverage_content_type "coordinate";
    Float64 fillvalue -99999.0;
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/longitude";
    String units "degrees_east";
    Float64 valid_max -90.5713;
    Float64 valid_min -90.5713;
  }
  region {
    String coverage_content_type "auxiliaryInformation";
    String ioos_category "Identifier";
    String long_name "site region";
    String standard_name "site_region";
  }
  site_id {
    Float64 _FillValue -99999.0;
    Float64 actual_range 600.0, 600.0;
    String coverage_content_type "auxiliaryInformation";
    String ioos_category "Identifier";
    String long_name "Site Identification";
    Float64 missing_value -99999.0;
    String standard_name "site_id";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/unknown";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue -99999.0;
    Float64 actual_range 0.694, 1252.783;
    String axis "Z";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String coverage_content_type "coordinate";
    String grid_mapping "crs";
    String ioos_category "Location";
    String long_name "Depth";
    Float64 missing_value -99999.0;
    String ncei_name "DEPTH";
    String positive "down";
    String standard_name "depth";
    String standard_name_url "http://mmisw.org/ont/cf/parameter/depth";
    String units "m";
    Float64 valid_max 1252.783;
    Float64 valid_min 0.694;
  }
  sea_water_temperature {
    Float64 _FillValue -99999.0;
    Float64 actual_range 4.272504, 23.091054;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "crs";
    String ioos_category "Temperature";
    String long_name "sea_water_temperature";
    Float64 missing_value -99999.0;
    String ncei_name "TEMPERATURE";
    String platform "RV_Atlantis";
    String source "in situ measuremnts";
    String standard_name "sea_water_temperature";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/water_temperature";
    String units "degree_Celsius";
    Float64 valid_max 23.091054;
    Float64 valid_min -99999.0;
  }
  methane {
    Float64 _FillValue -99999.0;
    Float64 actual_range 0.008211926, 107.5772717;
    Float64 colorBarMaximum 50000.0;
    Float64 colorBarMinimum -150000.0;
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "crs";
    String ioos_category "Unknown";
    String long_name "methane CH4_from_Mets1_G107_E312(nmol l-1)";
    Float64 missing_value -99999.0;
    String platform "RV_Atlantis";
    String source "in situ measuremnts";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/unknown";
    String units "nmol l-1";
    Float64 valid_max 107.5772717;
    Float64 valid_min -99999.0;
  }
  laserCH4 {
    Float64 _FillValue -99999.0;
    Float64 colorBarMaximum -94000.0;
    Float64 colorBarMinimum -106000.0;
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "crs";
    String ioos_category "Unknown";
    String long_name "Laser_CH4[ppmv]";
    Float64 missing_value -99999.0;
    String platform "RV_Atlantis";
    String source "in situ measuremnts";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/unknown";
    String units "nmol l-1";
    Float64 valid_max -99999.0;
    Float64 valid_min -99999.0;
  }
  laserCH4_2 {
    Float64 _FillValue -99999.0;
    Float64 colorBarMaximum -94000.0;
    Float64 colorBarMinimum -106000.0;
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "crs";
    String ioos_category "Unknown";
    String long_name "laser 2 CH4 concentration";
    Float64 missing_value -99999.0;
    String platform "RV_Atlantis";
    String source "in situ measuremnts";
    String standard_name_url "http://mmisw.org/ont/ioos/parameter/unknown";
    String units "nmols";
    Float64 valid_max -99999.0;
    Float64 valid_min -99999.0;
  }
  platform {
    String actual_range 
"
";
    String ioos_category "Unknown";
    String long_name "RV_Atlantis";
  }
  instrument {
    String actual_range 
"
";
    String ioos_category "Unknown";
    String long_name "CTD";
  }
  instrument1 {
    String actual_range 
"
";
    String ioos_category "Unknown";
    String long_name "METS";
  }
  crs {
    Int32 _FillValue -999;
    String epsg_code "EPSG:4326";
    String grid_mapping_name "latitude_longitude";
    Float64 inverse_flattening 298.257223563;
    String ioos_category "Unknown";
    String long_name "grid mapping variable for horizontal spatial coordinate reference system (CRS)";
    Float64 longitude_of_prime_meridian 0.0;
    Int32 missing_value -999;
    Float64 semi_major_axis 6378137.0;
    String standard_name_url "http://mmisw.org/ont/cf/parameter/unknown";
  }
 }
  NC_GLOBAL {
    String cdm_altitude_proxy "depth";
    String cdm_data_type "Profile";
    String cdm_profile_variables "profile";
    String contributor_country "USA";
    String contributor_email "cmartens@email.unc.edu";
    String contributor_institution "University of North Carolina at Chapel Hill";
    String contributor_name "Chris Martens";
    String contributor_phone "+1-919-962-0152";
    String contributor_role "Distinguished Professor";
    String contributor_role_vocabulary "https://vocab.nerc.ac.uk/collection/G04/current/";
    String contributor_url "https://emes.unc.edu/people-indiv/christopher-martens/";
    String Conventions "CF-1.6, ACDD-1.3, IOOS-1.2, COARDS";
    String Country "USA";
    String creator_address "3202 Venable Hall, CB 3300";
    String creator_city "Chapel Hill";
    String creator_country "USA";
    String creator_email "mendlovitz@unc.edu";
    String creator_institution "University of North Carolina at Chapel Hill";
    String creator_name "Howard Mendlovitz";
    String creator_phone "+1-919-962-0128";
    String creator_postalcode "27599";
    String creator_role "Chemical Engineer";
    String creator_sector "academic";
    String creator_state "North Carolina";
    String creator_type "person";
    String creator_url "https://schmidtocean.org/person/howard-mendlovitz/";
    String cruise_name "AT26-13";
    String date_created "2021-09-26T20:33:25Z";
    String date_issued "2021-09-26T20:33:25Z";
    String date_metadata_modified "2021-09-26T20:33:25Z";
    String date_modified "2021-09-26T20:33:25Z";
    Float64 Easternmost_Easting -90.5713;
    String featureType "Profile";
    String geospatial_bounds "Point (28.8523 -88.4921, 27.3708 -90.5713, 27.9897 -91.2826, 28.7 -88.3612, 27.318 -92.1082, 27.7071 -90.6508)";
    String geospatial_bounds_crs "EPSG:4326";
    String geospatial_bounds_vertical_crs "EPSG:5831";
    Float64 geospatial_lat_max 27.3708;
    Float64 geospatial_lat_min 27.3708;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -90.5713;
    Float64 geospatial_lon_min -90.5713;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 1252.783;
    Float64 geospatial_vertical_min 0.694;
    String geospatial_vertical_positive "down";
    Float64 geospatial_vertical_resolution -4.082864677659929e-6;
    String geospatial_vertical_units "m";
    String history 
"2021-09-26T20:31:59Z
2025-01-18T18:20:59Z (local files)
2025-01-18T18:20:59Z https://erddap.griidc.org/tabledap/R1_x132_134_0119_GOM_Nothern_Gulf_CTD_CH4_All_42014_GC600.das";
    String id "GOM-Nothern-Gulf-CTD-CH4-All";
    String infoUrl "https://data.gulfresearchinitiative.org/data/R1.x132.134:0119";
    String institution "University of North Carolina at Chapel Hill";
    String instrument "CTD - METS sensor";
    String instrument_vocabulary "GCMD Science Keywords Version 9.1.5";
    String keywords "1-30, all, at18, at18-02, atlantis, carolina, ch4, chapel, concentration, conductivity, coordinate, crs, ctd, data, depth, e312, earth, Earth Science > Oceans > Ocean Temperature > Water Temperature, g107, gc246, gc600, gom, gom-nothern-gulf-ctd-ch4-all-42014-gc600, grid, gulf, gulf of mexico, hill, horizontal, identification, identifier, instrument, instrument1, l-1, laser, laserCH4, laserCH4_2, latitude, longitude, mapping, mc118, methane, mets, mets1, mexico, nmol, north, nothern, oc26, ocean, oceans, platform, ppmv, profile, r/v, reference, region, science, sea, sea_water_temperature, seawater, sensor, site, site_id, site_region, sonde, spatial, system, temperature, time, university, v, variable, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "These data may be redistributed and used without restriction.";
    String metadata_link "https://data.gulfresearchinitiative.org/data/R1.x132.134:0119";
    String naming_authority "edu.unc";
    Float64 Northernmost_Northing 27.3708;
    String platform "RV_Atlantis";
    String platform_name "RV_Atlantis";
    String platform_vocabulary "https://mmisw.org/ont/ioos/platform";
    String processing_level "Geophysical units from raw data";
    String product_version "v0.0";
    String program "The Gulf of Mexico Research Initiative (GOMRI)";
    String project "Consortium for Advanced Research on Transport of Hydrocarbon in the Environment (ECOGIG)";
    String publisher_address "6300 Ocean Drive";
    String publisher_city "Corpus Christi";
    String publisher_country "USA";
    String publisher_email "griidc@gomri.org";
    String publisher_institution "Gulf of Mexico Research Initiative Information and Data (GRIIDC)";
    String publisher_name "Gulf of Mexico Research Initiative Information and Data (GRIIDC)";
    String publisher_phone "+1-301-713-3277";
    String publisher_postalcode "78412";
    String publisher_state "Texas";
    String publisher_type "institution";
    String publisher_udi "R1.x132.134:0119";
    String publisher_url "https://data.gulfresearchinitiative.org";
    String references "data.gomri.org";
    String sea_name "Gulf of Mexico";
    String source "in situ measuremnts";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 27.3708;
    String standard_name_vocabulary "CF Standard Name Table v72";
    String subsetVariables "profile, latitude, longitude, region, site_id, laserCH4, laserCH4_2, platform, instrument, instrument1, crs";
    String summary "Methane data from Conductivity, Temperature, Depth (CTD) - METS sensor (R/V Atlantis: AT18-02), Gulf of Mexico, April 1-30, 2014. Methane data taken from around the northern gulf with the METS sensor. This data is to look at the concentration difference within the area. Data was collected on the R/V Atlantis Cruise AT26-13 that took place from March 30 to April 22 2014.";
    String time_coverage_duration "P00Y0M05DT04H16M00S";
    String time_coverage_end "2014-04-10T10:26:00Z";
    String time_coverage_resolution "PT00S";
    String time_coverage_start "2014-04-05T06:10:00Z";
    String title "Profile - R1.x132.134.0119 - GOM-Nothern-Gulf-CTD-CH4-All-42014-GC600 - 27.37N, 90.57W - 2014-04-05";
    Float64 Westernmost_Easting -90.5713;
  }
}

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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