Make A Graph

Dataset Title:	Wave field - North Sea - WAM ECMWF
Institution:	Royal Belgian Institute of Natural Sciences, Directorate Natural Environment, Marine Forecasting Centre (Dataset ID: WAM_ECMWF)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
Color Bar:	Continuity:	Scale:
Minimum:	Maximum:	N Sections:
Draw land mask:
Y Axis Minimum:	Maximum:

(Please be patient. It may take a while to get the data.)

Optional:
Then set the File Type: (File Type information)
and

or view the URL:
(Documentation / Bypass this form

)

Click on the map to specify a new center point.

Zoom:

[The graph you specified. Please be patient.]

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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.5255648e+9, 1.7146044e+9;
    String axis "T";
    String calendar "gregorian";
    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";
    Float64 actual_range 48.5, 57.03333333333333;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -4.05, 9.25;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  hs {
    Float64 _FillValue -1.0;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Surface Waves";
    String long_name "Significant wave height (total)";
    String standard_name "sea_surface_wave_significant_height";
    String units "m";
  }
  tm02 {
    Float64 _FillValue -1.0;
    String ioos_category "Time";
    String long_name "Mean zero upcrossing period";
    String units "seconds";
  }
  tm_1 {
    Float64 _FillValue -1.0;
    String ioos_category "Time";
    String long_name "Mean period";
    String units "seconds";
  }
  tpeak {
    Float64 _FillValue -1.0;
    String ioos_category "Time";
    String long_name "Peak period";
    String units "seconds";
  }
  dirw {
    Float64 _FillValue -180.0;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Surface Waves";
    String long_name "Wave direction";
    String standard_name "sea_surface_wave_to_direction";
    String units "degrees";
  }
  NC_GLOBAL {
    String _NCProperties "version=1|netcdflibversion=4.5.0|hdf5libversion=1.10.1";
    String cdm_data_type "Grid";
    String comments "Visit the Marine Forecasting Centre website at http://www.marineforecasts.be.";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creation "Hourly data . First DateTime 202405010000 . Computed on cycle: 20240428.P";
    String creation_date "Dataset updated twice daily";
    String creator_name "MFC ODNature RBINS";
    String creator_type "institution";
    Float64 Easternmost_Easting 9.25;
    Float64 geospatial_lat_max 57.03333333333333;
    Float64 geospatial_lat_min 48.5;
    Float64 geospatial_lat_resolution 0.06666666666666665;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 9.25;
    Float64 geospatial_lon_min -4.05;
    Float64 geospatial_lon_resolution 0.1;
    String geospatial_lon_units "degrees_east";
    String history 
"Operational Forecasts based on model WAM. For more info on the WAM model, refer to \"The WAM Model - A Third Generation Ocean Wave Prediction Model\", Wamdi group, Journal of Physical Oceanography, December 1998, pp 1775-1810.
2024-04-29T07:12:50Z (local files)
2024-04-29T07:12:50Z https://erddap.naturalsciences.be/griddap/WAM_ECMWF.das";
    String infoUrl "http://www.marineforecasts.be";
    String institution "Royal Belgian Institute of Natural Sciences, Directorate Natural Environment, Marine Forecasting Centre";
    String keywords "analysis, centre, data, direction, directorate, dirw, earth, Earth Science > Oceans > Ocean Waves > Significant Wave Height, Earth Science > Oceans > Ocean Waves > Wave Speed/Direction, environment, field, forecasting, forecasts, height, marine, mean, natural, north, ocean, oceans, operational, peak, period, rbins, science, sea, sea_surface_wave_significant_height, sea_surface_wave_to_direction, significant, spectral, speed, surface, surface waves, time, tm02, tm_1, total, tpeak, upcrossing, wam, wave, waves, zero";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"This dataset is licensed under a <b>Creative Commons Attribution 4.0 International License</b>. <br/>
<a rel=\"license\" href=\"https://creativecommons.org/licenses/by/4.0/\"><img alt=\"Creative Commons License\" style=\"border-width:0\" src=\"https://i.creativecommons.org/l/by/4.0/88x31.png\" /></a>

This means you are free to share and adapt the licensed material, but you must give RBINS/MFC appropriate credits, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. In addition, you may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.";
    String meteo "ECMWF meteo 1_hourly fields";
    Float64 Northernmost_Northing 57.03333333333333;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 48.5;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "This dataset contains the operational WAM wave forecasts for the sea state of the North Sea. The domain covers latitudes from 48.5 to 57 and longitudes from -4 to 9. The grid has a resolution of 0.1 in longitude and 0.0666 in latitude. Teh spectral analysis is provided every hour. The sea surface is forced by the hourly meteo forecasts provided by the ECMWF.";
    String time_coverage_end "2024-05-01T23:00:00Z";
    String time_coverage_start "2018-05-06T00:00:00Z";
    String title "Wave field - North Sea - WAM ECMWF";
    Float64 Westernmost_Easting -4.05;
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its projection 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. It makes 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.

griddap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.