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Dataset Title:	Versions Index - Chlorophyll-a and Salinity Data Derived From Satellite Images for the Estuary and Gulf of St. Lawrence Since 1997 \| Données de chlorophylle-a et de salinité dérivées d'images satellitaires pour l'estuaire et le golfe du St-Laurent, depuis 1997
Institution:	Fisheries and Oceans Canada (Dataset ID: mpoChloroSatelliteVersions)
Information:	Summary \| License \| Metadata \| Background \| Subset \| 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:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  dataset_version {
    String long_name "Version of the dataset";
    String units "unitless";
  }
  time_coverage_start {
    Float64 actual_range 8.733312e+8, 8.836128e+8;
    String dcim_standard_name "coverage";
    String dcim_standard_name_identifier "http://purl.org/dc/elements/1.1/coverage";
    String ioos_category "Time";
    String long_name "Beginning of period covered";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
    String nerc_standard_name "Date";
    String standard_name "time";
    String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0115/";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  time_coverage_end {
    Float64 actual_range 1.5935616e+9, 1.7039808e+9;
    String dcim_standard_name "coverage";
    String dcim_standard_name_identifier "http://purl.org/dc/elements/1.1/coverage";
    String ioos_category "Time";
    String long_name "End of period covered";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
    String nerc_standard_name "Date";
    String standard_name "time";
    String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0115/";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  geospatial_lat_max {
    Float32 actual_range 51.875, 51.90104;
    String dcim_standard_name "coverage";
    String dcim_standard_name_identifier "http://purl.org/dc/elements/1.1/coverage";
    String description "Northernmost latitude covered by the dataset";
    String ioos_category "Location";
    String long_name "Maximum latitude";
    String standard_name "latitude";
    String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0600/";
    String units "degrees_north";
  }
  geospatial_lat_min {
    Float32 actual_range 45.1875, 45.20833;
    String dcim_standard_name "coverage";
    String dcim_standard_name_identifier "http://purl.org/dc/elements/1.1/coverage";
    String description "Southernmost latitude covered by the dataset";
    String ioos_category "Location";
    String long_name "Minimum latitude";
    String standard_name "latitude";
    String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0600/";
    String units "degrees_north";
  }
  geospatial_lon_max {
    Float32 actual_range -55.45833, -55.39583;
    String dcim_standard_name "coverage";
    String dcim_standard_name_identifier "http://purl.org/dc/elements/1.1/coverage";
    String description "Easternmost longitude covered by the dataset";
    String ioos_category "Location";
    String long_name "Maximum longitude";
    String standard_name "latitude";
    String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0600/";
    String units "degrees_north";
  }
  geospatial_lon_min {
    Float32 actual_range -71.3125, -70.70834;
    String dcim_standard_name "coverage";
    String dcim_standard_name_identifier "http://purl.org/dc/elements/1.1/coverage";
    String description "Westernmost longitude covered by the dataset";
    String ioos_category "Location";
    String long_name "Minimum longitude";
    String standard_name "latitude";
    String standard_name_identifier "https://vocab.nerc.ac.uk/collection/P07/current/CFSN0600/";
    String units "degrees_north";
  }
  geospatial_resolution {
    Float32 actual_range 1.0, 4.0;
    String description "Information about the targeted spacing of points";
    String ioos_category "Other";
    String long_name "Spatial resolution";
    String units "km";
  }
  accessURI {
    String dwc_standard_name "accessURI";
    String dwc_standard_name_identifier "http://rs.tdwg.org/ac/terms/accessURI";
    String ioos_category "Other";
    String units "unitless";
  }
  dimensions {
    String description "A dimension is a one dimensional array of values. Each grid data variable has these dimensions (axes)";
    String ioos_category "Other";
    String long_name "Dimensions";
    String units "unitless";
  }
  grid_variables {
    String description "Variables Included in the dataset";
    String ioos_category "Other";
    String long_name "Variables";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Other";
    String Conventions "COARDS, CF-1.11, ACDD-1.3, 0";
    String creator_email "Julien.Laliberte@dfo-mpo.gc.ca";
    String creator_identifier "https://orcid.org/0000-0001-6698-029X";
    String creator_name "Julien Laliberté";
    String creator_type "person";
    String data_curator "St. Lawrence Global Observatory";
    String data_curator_fr "Observatoire global du Saint-Laurent";
    String dataset_status "OnGoing";
    String DOI "https://doi.org/10.26071/ogsl-969715ba-3747";
    String grid_mapping_epsg_code "EPSG:4326";
    String grid_mapping_epsg_code_url "https://epsg.io/4326";
    String grid_mapping_geographic_crs_name "WGS 84";
    String grid_mapping_inverse_flattening "298.2572236";
    String grid_mapping_name "latitude_longitude";
    String grid_mapping_prime_meridian_name "Greenwich";
    String grid_mapping_semi_major_axis "6378137";
    String history 
"2024-11-05T23:59:27Z (local files)
2024-11-05T23:59:27Z https://erddap.ogsl.ca/tabledap/mpoChloroSatelliteVersions.das";
    String infoUrl "https://catalogue.ogsl.ca/en/dataset/ca-cioos_969715ba-3747-42ec-b8b4-6280403562d4";
    String institution "Fisheries and Oceans Canada";
    String institution_fr "Pêches et Océans Canada";
    String institution_identifier "https://ror.org/02qa1x782";
    String keywords "chlorophyll a, model data, ocean surface salinity, phytoplankton, remote sensing, satellites";
    String keywords_fr "chlorophylle a, salinité de surface de l'océan, phytoplancton, télédétection, satellites, données de modèle";
    String keywords_vocabulary "NASA Global Change Master Directory (GCMD) Science Keywords and homemade keywords";
    String license "Open Government Licence - Canada";
    String licenseUrl "https://open.canada.ca/en/open-government-licence-canada";
    String marine_region "Gulf of St. Lawrence";
    String marine_region_identifier "http://marineregions.org/mrgid/4290";
    String platform "satellite";
    String platform_description "Sentinel-3A, Sentinel-3B, Aqua, Envisat, ORBVIEW 2 (SEASTAR), NOAA 20";
    String platform_id "2016-011A, 2018-039A, 2002-022A, 2002-009A, 1997-037A, 2017-073A";
    String platform_vocabulary "https://vocab.nerc.ac.uk/collection/L06/current/";
    String project "Coastal Environmental Baseline Program";
    String publisher_email "\"info@ogsl.ca\"";
    String publisher_name "St. Lawrence Global Observatory";
    String publisher_name_fr "Observatoire global du Saint-Laurent";
    String publisherID "https://ror.org/03wfagk22";
    String sourceUrl "(local files)";
    String standard_name_nerc_vocabulary "The NERC Vocabulary Server (NVS)";
    String standard_name_other_vocabulary "dwc: Darwin Core List of Terms (v 2023-09); dcmi: Dublin Core Metadata Initiative Metadata Terms (v 2020-01)";
    String standard_name_vocabulary "CF Standard Name Table v86";
    String subsetVariables "dataset_version";
    String summary "List of previous and current versions of the Chlorophyll-a (chla) concentration and surface salinity dataset for the Estuary and Gulf of St. Lawrence. The versions are the result of updates to the dataset itself, as well as the processing of satellite data from the European Space Agency's Ocean Color Climate Change (CCI) initiative. This dataset is produced as part of the Coastal Environmental Baseline Data Program under Fisheries and Oceans Canada's Oceans Protection Plan.";
    String summary_fr "Liste des versions antérieures et actuelles du jeu de données sur la concentration en chlorophylle-a (chla) et la salinité de surface dans l'estuaire et le golfe du Saint-Laurent. Les versions sont le résultat de mises à jour du jeu de données lui-même, ainsi que du traitement de données satellitaires provenant du programme Ocean Color Climate Change (CCI) de l'Agence spatiale européenne. Ce projet fait partie du Programme sur les données environnementales côtières de référence dans le cadre du Plan de protection des océans de Pêches et Océans Canada.";
    String title "Versions Index - Chlorophyll-a and Salinity Data Derived From Satellite Images for the Estuary and Gulf of St. Lawrence Since 1997 | Données de chlorophylle-a et de salinité dérivées d'images satellitaires pour l'estuaire et le golfe du St-Laurent, depuis 1997";
  }
}

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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