Make A Graph

Dataset Title:	St. Pierre et Miquelon Wave Buoy
Institution:	Cerema (Dataset ID: candhis_spm_97501_timeseries)
Range:	longitude = -56.1833 to -56.1833°E, latitude = 46.7 to 46.7°N, time = 2022-09-14T14:30:00Z to 2024-04-27T19:30:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Y Axis:

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Constraints	Optional Constraint #1		Optional Constraint #2

Server-side Functions

distinct()

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Graph Settings

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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 {
  station_id {
    String actual_range 
"97501
97501";
    String cf_role "timeseries_id";
    String ioos_category "Identifier";
    String long_name "Station ID";
    String long_name_fr "Code campagne";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6631658e+9, 1.7142462e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Timestamp";
    String source_name "timestamp";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 46.7, 46.7;
    String axis "Y";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -56.1833, -56.1833;
    String axis "X";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  wave_ht_sig {
    Float32 actual_range 0.0, 7.1;
    String ioos_category "Surface Waves";
    String long_name "Wave Ht Sig";
    String standard_name "sea_surface_wave_significant_height";
    String units "m";
  }
  wave_ht_max {
    Float32 actual_range 0.0, 13.0;
    String ioos_category "Surface Waves";
    String long_name "Wave Ht Max";
    String standard_name "sea_surface_wave_maximum_height";
    String units "m";
  }
  wave_period_avg {
    Float32 actual_range 0.0, 14.1;
    Float64 colorBarMaximum 20.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Surface Waves";
    String long_name "Sea Surface Swell Wave Period";
    String standard_name "sea_surface_swell_wave_period";
    String units "s";
  }
  timestamp_internal {
    Float64 actual_range -2.2089888e+9, 1.7142444e+9;
    String ioos_category "Time";
    String long_name "Timestamp Internal";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  wave_ht_sig_Hm0 {
    Float32 actual_range 0.0, 14.2;
    String ioos_category "Surface Waves";
    String long_name "Wave Ht Sig Hm0";
    String standard_name "sea_surface_wave_significant_height";
    String units "m";
  }
  wave_period {
    Float32 actual_range 0.0, 16.0;
    Float64 colorBarMaximum 20.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Surface Waves";
    String long_name "Sea Surface Swell Wave Period";
    String standard_name "sea_surface_swell_wave_period";
    String units "s";
  }
  wave_period_peak {
    Float32 actual_range 0.0, 28.6;
    Float64 colorBarMaximum 20.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Surface Waves";
    String long_name "Sea Surface Swell Wave Period";
    String standard_name "sea_surface_swell_wave_period";
    String units "s";
  }
  wave_direction_peak_spectral {
    Int16 _FillValue 32767;
    Int16 actual_range 0, 356;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Surface Waves";
    String long_name "Wave Direction Peak Spectral";
    String standard_name "sea_surface_wave_directional_spread_at_variance_spectral_density_maximum";
    String units "spectral";
  }
  wave_spread_peak {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 0, 81;
    String ioos_category "Surface Waves";
    String long_name "Wave Spread Peak";
    String standard_name "sea_surface_wave_directional_spread";
    String units "degree";
  }
  sea_surface_temp_avg {
    Float32 actual_range 0.0, 19.9;
    String ioos_category "Surface Waves";
    String long_name "Sea Surface Temp Avg";
    String standard_name "sea_surface_temperature";
    String units "degree_C";
  }
  peak_power_spectral_density {
    Float64 actual_range 0.0, 766.774841;
    String ioos_category "Physical Oceanography";
    String long_name "Peak Power Spectral Density";
    String standard_name "sea_surface_wave_energy_at_variance_spectral_density_maximum";
    String units "m2 Hz-1";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "station_id,longitude,latitude";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "Cerema";
    String creator_type "institution";
    String creator_url "https://candhis.cerema.fr/";
    Float64 Easternmost_Easting -56.1833;
    String featureType "TimeSeries";
    Float64 geospatial_lat_max 46.7;
    Float64 geospatial_lat_min 46.7;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -56.1833;
    Float64 geospatial_lon_min -56.1833;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-04-27T20:46:10Z (local files)
2024-04-27T20:46:10Z https://cioosatlantic.ca/tabledap/candhis_spm_97501_timeseries.das";
    String infoUrl "https://candhis.cerema.fr/_public_/campagne.php?Y2FtcD05NzUwMQ==";
    String institution "Cerema";
    String instrument "Houlographe Datawell DWR MkIII 70";
    String keywords "average, buoy, data, density, direction, earth, Earth Science > Oceans > Ocean Waves > Swells, Earth Science > Oceans > Ocean Waves > Wave Period, hm0, internal, max, miquelon, ocean, oceanography, oceans, peak, peak_power_spectral_density, period, physical, physical oceanography, pierre, power, science, sea, sea_surface_swell_wave_period, sea_surface_temp_avg, sig, spectral, spread, surface, surface waves, swell, swells, temperature, time, timestamp, timestamp_internal, wave, wave_direction_peak_spectral, wave_ht_max, wave_ht_sig, wave_ht_sig_Hm0, wave_period, wave_period_avg, wave_period_peak, wave_spread_peak, waves";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "https://creativecommons.org/licenses/by/4.0/";
    Float64 Northernmost_Northing 46.7;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 46.7;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "St. Pierre et Miquelon Wave Buoy";
    String testOutOfDate "now-1hour";
    String time_coverage_end "2024-04-27T19:30:00Z";
    String time_coverage_start "2022-09-14T14:30:00Z";
    String title "St. Pierre et Miquelon Wave Buoy";
    Float64 Westernmost_Easting -56.1833;
  }
}

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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