Make A Graph

Dataset Title:	Wave fields (2D), Hourly Instantaneous
Institution:	HCMR -Athens,Greece (Dataset ID: cmems_mod_med_wav_anfc_4_2km_PT1H_i)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

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Stop

time (UTC)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

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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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.775088e+9, 1.7756928e+9;
    String axis "T";
    String calendar "standard";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String unit_long "Seconds Since 1970-01-01";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 43.3125, 44.6875;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 7.500001, 10.45833;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  VCMX {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Maximum crest trough wave height (Hc,max)";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_maximum_height";
    String type_of_analysis "spectral analysis";
    String units "m";
    Float64 valid_max 32.00000151991844;
    Float64 valid_min 0.0;
  }
  VHM0 {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral significant wave height (Hm0)";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_significant_height";
    String type_of_analysis "spectral analysis";
    String units "m";
    Float64 valid_max 30.00000142492354;
    Float64 valid_min 0.0;
    Float64 WMO 100;
  }
  VHM0_SW1 {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral significant primary swell wave height";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_primary_swell_wave_significant_height";
    String type_of_analysis "spectral analysis";
    String units "m";
    Float64 valid_max 30.00000142492354;
    Float64 valid_min 0.0;
    Float64 WMO 202;
  }
  VHM0_SW2 {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral significant secondary swell wave height";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_secondary_swell_wave_significant_height";
    String type_of_analysis "spectral analysis";
    String units "m";
    Float64 valid_max 30.00000142492354;
    Float64 valid_min 0.0;
    Float64 WMO 203;
  }
  VHM0_WW {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral significant wind wave height";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wind_wave_significant_height";
    String type_of_analysis "spectral analysis";
    String units "m";
    Float64 valid_max 30.00000142492354;
    Float64 valid_min 0.0;
    Float64 WMO 102;
  }
  VMDR {
    Float64 _FillValue -147.66999267600477;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Mean wave direction from (Mdir)";
    Float64 missing_value -147.66999267600477;
    String standard_name "sea_surface_wave_from_direction";
    String type_of_analysis "spectral analysis";
    String units "degree";
    Float64 valid_max 359.9999959766865;
    Float64 valid_min 4.023313522338867e-6;
    Float64 WMO 200;
  }
  VMDR_SW1 {
    Float64 _FillValue -147.66999267600477;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Mean primary swell wave direction from";
    Float64 missing_value -147.66999267600477;
    String standard_name "sea_surface_primary_swell_wave_from_direction";
    String type_of_analysis "spectral analysis";
    String units "degree";
    Float64 valid_max 359.9999959766865;
    Float64 valid_min 4.023313522338867e-6;
    Float64 WMO 107;
  }
  VMDR_SW2 {
    Float64 _FillValue -147.66999267600477;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Mean secondary swell wave direction from";
    Float64 missing_value -147.66999267600477;
    String standard_name "sea_surface_secondary_swell_wave_from_direction";
    String type_of_analysis "spectral analysis";
    String units "degree";
    Float64 valid_max 359.9999959766865;
    Float64 valid_min 4.023313522338867e-6;
    Float64 WMO 109;
  }
  VMDR_WW {
    Float64 _FillValue -147.66999267600477;
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Mean wind wave direction from";
    Float64 missing_value -147.66999267600477;
    String standard_name "sea_surface_wind_wave_from_direction";
    String type_of_analysis "spectral analysis";
    String units "degree";
    Float64 valid_max 359.9999959766865;
    Float64 valid_min 4.023313522338867e-6;
    Float64 WMO 101;
  }
  VMXL {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 40.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Height of the highest crest";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_maximum_crest_height";
    String type_of_analysis "spectral analysis";
    String units "m";
    Float64 valid_max 30.00000142492354;
    Float64 valid_min 0.0;
  }
  VPED {
    Float64 _FillValue -147.66999267600477;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Wave principal direction at spectral peak";
    Float64 missing_value -147.66999267600477;
    String standard_name "sea_surface_wave_from_direction_at_variance_spectral_density_maximum";
    String type_of_analysis "spectral analysis";
    String units "degree";
    Float64 valid_max 359.9999959766865;
    Float64 valid_min 4.023313522338867e-6;
  }
  VSDX {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 1.5;
    Float64 colorBarMinimum -1.5;
    String long_name "Stokes drift U";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_stokes_drift_x_velocity";
    String type_of_analysis "spectral analysis";
    String units "m/s";
    Float64 valid_max 1.0000000474974513;
    Float64 valid_min -1.0000000474974513;
    Float64 WMO 215;
  }
  VSDY {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 1.5;
    Float64 colorBarMinimum -1.5;
    String long_name "Stokes drift V";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_stokes_drift_y_velocity";
    String type_of_analysis "spectral analysis";
    String units "m/s";
    Float64 valid_max 1.0000000474974513;
    Float64 valid_min -1.0000000474974513;
    Float64 WMO 216;
  }
  VTM01_SW1 {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 20.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral moments (0,1) primary swell wave period";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_primary_swell_wave_mean_period";
    String type_of_analysis "spectral analysis";
    String units "s";
    Float64 valid_max 32.00000151991844;
    Float64 valid_min 0.0;
    Float64 WMO 226;
  }
  VTM01_SW2 {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 20.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral moments (0,1) secondary swell wave period";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_secondary_swell_wave_mean_period";
    String type_of_analysis "spectral analysis";
    String units "s";
    Float64 valid_max 32.00000151991844;
    Float64 valid_min 0.0;
    Float64 WMO 227;
  }
  VTM01_WW {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 20.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral moments (0,1) wind wave period";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wind_wave_mean_period";
    String type_of_analysis "spectral analysis";
    String units "s";
    Float64 valid_max 32.00000151991844;
    Float64 valid_min 0.0;
    Float64 WMO 223;
  }
  VTM02 {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral moments (0,2) wave period (Tm02)";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment";
    String type_of_analysis "spectral analysis";
    String units "s";
    Float64 valid_max 32.00000151991844;
    Float64 valid_min 0.0;
    Float64 WMO 221;
  }
  VTM10 {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Spectral moments (-1,0) wave period (Tm-10)";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_mean_period_from_variance_spectral_density_inverse_frequency_moment";
    String type_of_analysis "spectral analysis";
    String units "s";
    Float64 valid_max 32.00000151991844;
    Float64 valid_min 0.0;
    Float64 WMO 201;
  }
  VTPK {
    Float64 _FillValue -32.76700155634899;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Wave period at spectral peak / peak period (Tp)";
    Float64 missing_value -32.76700155634899;
    String standard_name "sea_surface_wave_period_at_variance_spectral_density_maximum";
    String type_of_analysis "spectral analysis";
    String units "s";
    Float64 valid_max 32.00000151991844;
    Float64 valid_min 0.0;
    Float64 WMO 204;
  }
  NC_GLOBAL {
    String area "MED";
    String bulletin_date "2023-11-01";
    String bulletin_type "analysis";
    String cdm_data_type "Grid";
    String comment "Please check in CMEMS catalogue the INFO section for product MEDSEA_ANALYSISFORECAST_WAV_006_017 - http://marine.copernicus.eu";
    String contact "servicedesk.cmems@mercator-ocean.eu";
    String Conventions "CF-1.10, COARDS, ACDD-1.3";
    String copernicusmarine_version "2.3.0";
    String creator_email "servicedesk.cmems@mercator-ocean.eu";
    String creator_name "HCMR -Athens,Greece";
    String creator_type "institution";
    String credit "Copernicus Marine Environment Monitoring Service (CMEMS)";
    Float64 Easternmost_Easting 10.45833;
    String field_type "hourly_instantaneous_at_time_field";
    Float64 geospatial_lat_max 44.6875;
    Float64 geospatial_lat_min 43.3125;
    Float64 geospatial_lat_resolution 0.041666666666666664;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 10.45833;
    Float64 geospatial_lon_min 7.500001;
    Float64 geospatial_lon_resolution 0.04166660563380282;
    String geospatial_lon_units "degrees_east";
    String history 
"MEDWAM4
2026-04-03T04:35:16Z (local files)
2026-04-03T04:35:16Z https://erddap.s4raise.it/griddap/cmems_mod_med_wav_anfc_4_2km_PT1H_i.das";
    String infoUrl "???";
    String institution "HCMR -Athens,Greece";
    String keywords "-athens, crest, data, density, direction, drift, earth, Earth Science > Oceans > Ocean Waves > Significant Wave Height, Earth Science > Oceans > Ocean Waves > Wave Frequency, Earth Science > Oceans > Ocean Waves > Wave Period, Earth Science > Oceans > Ocean Waves > Wave Spectra, Earth Science > Oceans > Ocean Waves > Wave Speed/Direction, Earth Science > Oceans > Ocean Waves > Wind Waves, fields, frequency, greece, hcmr, height, highest, hm0, hour, hourly, instantaneous, inverse, latitude, longitude, max, maximum, mdir, mean, moment, moments, ocean, oceans, peak, period, primary, principal, science, sea, sea_surface_primary_swell_wave_from_direction, sea_surface_primary_swell_wave_mean_period, sea_surface_primary_swell_wave_significant_height, sea_surface_secondary_swell_wave_from_direction, sea_surface_secondary_swell_wave_mean_period, sea_surface_secondary_swell_wave_significant_height, sea_surface_wave_from_direction, sea_surface_wave_from_direction_at_variance_spectral_density_maximum, sea_surface_wave_maximum_crest_height, sea_surface_wave_maximum_height, sea_surface_wave_mean_period_from_variance_spectral_density_inverse_frequency_moment, sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment, sea_surface_wave_period_at_variance_spectral_density_maximum, sea_surface_wave_significant_height, sea_surface_wave_stokes_drift_x_velocity, sea_surface_wave_stokes_drift_y_velocity, sea_surface_wind_wave_from_direction, sea_surface_wind_wave_mean_period, sea_surface_wind_wave_significant_height, second, secondary, significant, spectra, spectral, speed, stokes, surface, swell, time, tm-10, tm02, trough, u, v, variance, VCMX, velocity, VHM0, VHM0_SW1, VHM0_SW2, VHM0_WW, VMDR, VMDR_SW1, VMDR_SW2, VMDR_WW, VMXL, VPED, VSDX, VSDY, VTM01_SW1, VTM01_SW2, VTM01_WW, VTM02, VTM10, VTPK, wave, waves, wind";
    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 44.6875;
    String producer "CMEMS-MED Monitoring and Forecasting Centre";
    String references "Please check in CMEMS catalogue the INFO section for product MEDSEA_ANALYSISFORECAST_WAV_006_017 - http://marine.copernicus.eu";
    String source "MEDWAM4";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 43.3125;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Wave fields (2D) - Hourly Instantaneous. Please check in CMEMS catalogue the INFO section for product MEDSEA_ANALYSISFORECAST_WAV_006_017 - http://marine.copernicus.eu";
    String testOutOfDate "now+6days";
    String time_coverage_end "2026-04-09T00:00:00Z";
    String time_coverage_start "2026-04-02T00:00:00Z";
    String title "Wave fields (2D), Hourly Instantaneous";
    Float64 Westernmost_Easting 7.500001;
  }
}

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.