Data Access Form

Dataset Title:	Data for XR01_xCO2 for the period 2021/04
Institution:	GCOOS (Dataset ID: XR01_xCO2)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Variable	Minimum	Maximum
time (UTC)	2021-04-20T06:49:09Z	2021-04-24T15:07:09Z

latitude (degrees_north)	27.09881	29.13265

longitude (degrees_east)	-95.03257	-90.57245

sea_surface_temperature (degree_Celsius)	19.7358	24.1881
sea_surface_salinity (PSU)	17.6802	36.434
mole_fraction_of_carbon_dioxide_in_air (ppm)	239.8185	953.0634
air_pressure (kPa)	100.5	102.14

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.618901349e+9, 1.619276829e+9;
    String axis "T";
    String calendar "julian";
    Float64 colorBarMaximum 1.6193e+9;
    Float64 colorBarMinimum 1.6188e+9;
    String ioos_category "Time";
    String long_name "Time";
    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 actual_range 27.09881, 29.13265;
    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";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -95.03257, -90.57245;
    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";
    Float32 valid_max 180.0;
    Float32 valid_min -180.0;
  }
  sea_surface_temperature {
    Float32 _FillValue -9999.0;
    Float32 actual_range 19.7358, 24.1881;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String gts_ingest "false";
    String instrument "water_temperature_instrument_1";
    String ioos_category "Temperature";
    String long_name "sea surface temperature";
    Float32 missing_value -9999.0;
    String ncei_name "sea_surface_temperature";
    String platform "platform";
    String references "https://mmisw.org/ont/ioos/parameter/water_temperature";
    String source "Local Data Node";
    String standard_name "sea_surface_temperature";
    String standard_name_url "https://mmisw.org/ont/cf/parameter/sea_water_temperature";
    String units "degree_Celsius";
    Float32 valid_max 35.0;
    Float32 valid_min -10.0;
  }
  sea_surface_salinity {
    Float32 _FillValue -9999.0;
    Float32 actual_range 17.6802, 36.434;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String gts_ingest "false";
    String instrument "salinity_instrument_1";
    String ioos_category "Salinity";
    String long_name "Sea Surface Salinity";
    Float32 missing_value -9999.0;
    String ncei_name "sea_surface_salinity";
    String platform "platform";
    String references "https://mmisw.org/ont/cf/parameter/sea_water_salinity";
    String source "Local Data Node";
    String standard_name "sea_water_practical_salinity";
    String standard_name_url "https://mmisw.org/ont/cf/parameter/sea_water_salinity";
    String units "PSU";
    Float32 valid_max 50.0;
    Float32 valid_min 0.0;
  }
  mole_fraction_of_carbon_dioxide_in_air {
    Float32 _FillValue -9999.0;
    Float32 actual_range 239.8185, 953.0634;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String gts_ingest "false";
    String instrument "xco2_instrument_1";
    String ioos_category "CO2";
    String long_name "mole fraction of carbon dioxide in air";
    Float32 missing_value -9999.0;
    String ncei_name "mole_fraction_of_carbon_dioxide_in_air";
    String platform "platform";
    String references "https://mmisw.org/ont/ioos/OA/xCO2";
    String source "Local Data Node";
    String standard_name "mole_fraction_of_carbon_dioxide_in_air";
    String standard_name_url "https://mmisw.org/ont/ioos/OA/xCO2";
    String units "ppm";
    Float32 valid_max 1500.0;
    Float32 valid_min 0.0;
  }
  air_pressure {
    Float32 _FillValue -9999.0;
    Float32 actual_range 100.5, 102.14;
    Float64 colorBarMaximum 1050.0;
    Float64 colorBarMinimum 950.0;
    String gts_ingest "false";
    String instrument "air_pressure_instrument_1";
    String ioos_category "Pressure";
    String long_name "air pressure";
    Float32 missing_value -9999.0;
    String ncei_name "air_pressure";
    String platform "platform";
    String references "https://mmisw.org/ont/ioos/parameter/air_pressure";
    String source "Local Data Node";
    String standard_name "air_pressure_at_mean_sea_level";
    String standard_name_url "https://mmisw.org/ont/cf/parameter/air_pressure";
    String units "kPa";
    Float32 valid_max 1085.0;
    Float32 valid_min 870.0;
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Point";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "GCOOS";
    String creator_type "institution";
    String creator_url "https://gcoos.org";
    Float64 Easternmost_Easting -90.57245;
    String featureType "Point";
    Float64 geospatial_lat_max 29.13265;
    Float64 geospatial_lat_min 27.09881;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -90.57245;
    Float64 geospatial_lon_min -95.03257;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-04-28T19:57:03Z (local files)
2024-04-28T19:57:03Z https://gcoos5.geos.tamu.edu/erddap/tabledap/XR01_xCO2.html";
    String infoUrl "https://gcoos.org";
    String institution "GCOOS";
    String keywords "2021/04, air, air_pressure, air_pressure_at_mean_sea_level, atmosphere, atmospheric, carbon, carbon dioxide, chemistry, co2, coastal, compounds, data, density, dioxide, earth, Earth Science > Atmosphere > Atmospheric Chemistry > Carbon And Hydrocarbon Compounds, Earth Science > Atmosphere > Atmospheric Chemistry > Carbon And Hydrocarbon Compounds > Carbon Dioxide, Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature, Earth Science > Oceans > Salinity/Density > Salinity, fraction, gcoos, gulf, hydrocarbon, latitude, level, longitude, mean, mexico, modification, mole, mole_fraction_of_carbon_dioxide_in_air, observing, ocean, oceans, period, practical, pressure, salinity, science, sea, sea_surface_salinity, sea_surface_temperature, sea_water_practical_salinity, seawater, surface, system, temperature, time, water, xr01";
    String keywords_vocabulary "GCMD Science Keywords";
    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 29.13265;
    String project "Ocean Acidification on a Crossroad - Enhanced Respiration, Upwelling, Increasing Atmospheric CO2, and their interactions in the northwestern Gulf of Mexico";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 27.09881;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Data for XR01 for the period 2021/04";
    String time_coverage_end "2021-04-24T15:07:09Z";
    String time_coverage_start "2021-04-20T06:49:09Z";
    String title "Data for XR01_xCO2 for the period 2021/04";
    Float64 Westernmost_Easting -95.03257;
  }
}

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.