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Dataset Title:  Integrated daily Photosynthetically Available Radiation (PAR) data from RVIB
Nathaniel B. Palmer cruises NBP0103, NBP0104, NBP0202, and NBP0204 in the
Southern Ocean from 2001-2002 (SOGLOBEC project)
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_2362)
Range: longitude = -76.7126 to -61.7236°E, latitude = -70.2915 to -61.0903°N
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | 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:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  year {
    Int16 _FillValue 32767;
    Int16 actual_range 2001, 2002;
    String bcodmo_name "year";
    String description "year of cruise";
    String long_name "Year";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/";
  }
  yrday_gmt {
    Int16 _FillValue 32767;
    Int16 actual_range 104, 258;
    String bcodmo_name "yrday_gmt";
    String description "year day based on Julian Calendar";
    String long_name "Yrday Gmt";
    String units "YYY";
  }
  length_day {
    Float32 _FillValue NaN;
    Float32 actual_range 4.45, 12.8;
    String bcodmo_name "length_day";
    String description "length of day (decimal hours) based on time between sunrise and sunset as indicated by sustained irradiance values above 0.0 uE/cm2/sec";
    String long_name "Length Day";
    String units "HH.H";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range -70.2915, -61.0903;
    String axis "Y";
    String bcodmo_name "latitude";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "noon latitude position, negative = South, extracted from ship's along track data";
    String ioos_category "Location";
    String long_name "Latitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range -76.7126, -61.7236;
    String axis "X";
    String bcodmo_name "longitude";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "noon longitude position, negative = West, extracted from ship's along track data";
    String ioos_category "Location";
    String long_name "Longitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
    String standard_name "longitude";
    String units "degrees_east";
  }
  par_d_day {
    Float64 _FillValue NaN;
    Float64 actual_range 5.83, 1286.1168;
    String bcodmo_name "par_d_day";
    String description "cosine irradiance (EsPAR), integrated over time period defined by the parameter length_day.    In this case units are reported as per day";
    String long_name "Par D Day";
    String units "uE/cm2/day";
  }
  par_scalar_day {
    Float64 _FillValue NaN;
    Float64 actual_range 33.7304, 3381.4322;
    String bcodmo_name "par_scalar_day";
    String description "scalar irradiance (PAR), (independent of direction), integrated over time period defined by the parameter length_day.  In this case units are reported as per day";
    String long_name "Par Scalar Day";
    String units "uE/cm2/day";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson";
    String acquisition_description 
"* The cosine PAR value for yrday_gmt 151 year 2001 is an estimate, based on a conversion from data recorded by the QSR240 scalar sensor package.
 
  * Latitude and longitude have been added to this data set by the Data Management Office. These positions are the noon (12:00 hour) positions reported in the ship's alongtrack data set.
 
  * Scalar PAR data was extracted from the ship's alongtrack meteorological data set. The sensor package was mounted on ship's science mast.";
    String awards_0_award_nid "54667";
    String awards_0_award_number "ANT-9910175";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=9910175";
    String awards_0_funder_name "NSF Antarctic Sciences";
    String awards_0_funding_acronym "NSF ANT";
    String awards_0_funding_source_nid "369";
    String awards_0_program_manager "Dr Polly  A Penhale";
    String awards_0_program_manager_nid "51478";
    String cdm_data_type "Other";
    String comment 
"Irradiance data collected during SOGLOBEC 
  M. Vernet	Principle Investigator 
  
  2001: yrdays 119-153(NBP0103): Irradiance data collected on a Biospherical  
      Instruments GUV500 (cosine irradiance) and integrated over 24-hour period, 
      sunrise to sunset. 
   All the remaining irradiance data was collected on both Biospherical 
        Instruments GUV500 (cosine irradiance) and QSR250 (scalar irradiance)  
        and integrated over a 24-hour period, sunrise to sunset. 
        yrdays 208-239(NBP0104) 
  2002: yrdays 104-131(NBP0202)   
        yrdays 215-258(NBP0204)   
  lat + lon: noon positions";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_type "institution";
    String creator_url "https://www.bco-dmo.org/";
    String data_source "extract_data_as_tsv version 2.3  19 Dec 2019";
    String date_created "2009-11-25T16:57:19Z";
    String date_modified "2019-03-04T21:23:15Z";
    String defaultDataQuery "&time<now";
    String doi "10.1575/1912/bco-dmo.2362.1";
    Float64 Easternmost_Easting -61.7236;
    Float64 geospatial_lat_max -61.0903;
    Float64 geospatial_lat_min -70.2915;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -61.7236;
    Float64 geospatial_lon_min -76.7126;
    String geospatial_lon_units "degrees_east";
    String history 
"2022-10-03T05:51:37Z (local files)
2022-10-03T05:51:37Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_2362.das";
    String infoUrl "https://www.bco-dmo.org/dataset/2362";
    String institution "BCO-DMO";
    String instruments_0_acronym "PAR sensor";
    String instruments_0_dataset_instrument_description "Photosynthetically Available Radiation, PAR (400-700nm). Cosine irradiance (EsPAR) sensors collect light impinging on a Teflon-coated diffuser and the response is proportional to the cosine of the angle of incidence.";
    String instruments_0_dataset_instrument_nid "4176";
    String instruments_0_description "A PAR sensor measures photosynthetically available (or active) radiation.  The sensor measures photon flux density (photons per second per square meter) within the visible wavelength range (typically 400 to 700 nanometers). PAR gives an indication of the total energy available to plants for photosynthesis.  This instrument name is used when specific type, make and model are not known.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/122/";
    String instruments_0_instrument_name "Photosynthetically Available Radiation Sensor";
    String instruments_0_instrument_nid "439";
    String instruments_0_supplied_name "Photosynthetically Available Radiation Sensors";
    String instruments_1_acronym "Radiometer";
    String instruments_1_dataset_instrument_description 
"Biospherical Instruments GUV-500 is a 5-channel reference radiometer which typically measures cosine-corrected down welling irradiance at 305, 320, 340, 380nm.
Biospherical Instruments QSR250 system measures a single channel of scalar irradiance (PAR) and is appropriate for applications independent of the directionality of the light field, such as measurements of the flux available for photosynthesis.";
    String instruments_1_dataset_instrument_nid "4177";
    String instruments_1_description "Radiometer is a generic term for a range of instruments used to measure electromagnetic radiation (radiance and irradiance) in the atmosphere or the water column.  For example, this instrument category includes free-fall spectral radiometer (SPMR/SMSR System, Satlantic, Inc), profiling or deck cosine PAR units (PUV-500 and 510, Biospherical Instruments, Inc).  This is a generic term used when specific type, make and model were not specified.";
    String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/122/";
    String instruments_1_instrument_name "Radiometer";
    String instruments_1_instrument_nid "442";
    String instruments_1_supplied_name "Radiometer";
    String keywords "available, bco, bco-dmo, biological, chemical, data, dataset, day, dmo, erddap, latitude, length, length_day, longitude, management, oceanography, office, par, par_d_day, par_scalar_day, photosynthetically, preliminary, radiation, scalar, year, yrday, yrday_gmt";
    String license "https://www.bco-dmo.org/dataset/2362/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/2362";
    Float64 Northernmost_Northing -61.0903;
    String param_mapping "{'2362': {'lat': 'master - latitude', 'lon': 'master - longitude'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/2362/parameters";
    String people_0_affiliation "University of California-San Diego";
    String people_0_affiliation_acronym "UCSD-SIO";
    String people_0_person_name "Dr Maria Vernet";
    String people_0_person_nid "50504";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Woods Hole Oceanographic Institution";
    String people_1_affiliation_acronym "WHOI BCO-DMO";
    String people_1_person_name "Ms Dicky Allison";
    String people_1_person_nid "50382";
    String people_1_role "BCO-DMO Data Manager";
    String people_1_role_type "related";
    String project "SOGLOBEC";
    String projects_0_acronym "SOGLOBEC";
    String projects_0_description "The fundamental objectives of United States Global Ocean Ecosystems Dynamics (U.S. GLOBEC) Program are dependent upon the cooperation of scientists from several disciplines. Physicists, biologists, and chemists must make use of data collected during U.S. GLOBEC field programs to further our understanding of the interplay of physics, biology, and chemistry. Our objectives require quantitative analysis of interdisciplinary data sets and, therefore, data must be exchanged between researchers. To extract the full scientific value, data must be made available to the scientific community on a timely basis.";
    String projects_0_geolocation "Southern Ocean";
    String projects_0_name "U.S. GLOBEC Southern Ocean";
    String projects_0_project_nid "2039";
    String projects_0_project_website "http://www.ccpo.odu.edu/Research/globec_menu.html";
    String projects_0_start_date "2001-01";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -70.2915;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Integrated daily Photosynthetically Available Radiation (PAR) data from RVIB Nathaniel B. Palmer cruises NBP0103, NBP0104, NBP0202, and NBP0204 in the Southern Ocean from 2001-2002 (SOGLOBEC project)";
    String title "Integrated daily Photosynthetically Available Radiation (PAR) data from RVIB Nathaniel B. Palmer cruises NBP0103, NBP0104, NBP0202, and NBP0204 in the Southern Ocean from 2001-2002 (SOGLOBEC project)";
    String version "1";
    Float64 Westernmost_Easting -76.7126;
    String xml_source "osprey2erddap.update_xml() v1.3";
  }
}

 

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.

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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