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Dataset Title:	Near Real Time Surface Ocean Radial Velocity by HFR-NAdr-IZOL
Institution:	NIB - Nacionalni inštitut za biologijo (Dataset ID: EUHFR_NRTcurrent_HFR-NAdr-IZOL)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:
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Y Axis:
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time (UTC)

specify just 1 value →

depth (m)

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 1.66587858e+9, 1.7716626e+9;
    String ancillary_variables "TIME_QC";
    String axis "T";
    String calendar "standard";
    String ioos_category "Time";
    String long_name "Time";
    String sdn_P02_urn "SDN:P02::AYMD";
    String sdn_parameter_name "Elapsed time (since 1950-01-01T00:00:00Z)";
    String sdn_parameter_urn "SDN:P01::ELTJLD01";
    String sdn_uom_name "Days";
    String sdn_uom_urn "SDN:P06::UTAA";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  depth {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float32 actual_range 0.0, 0.0;
    String ancillary_variables "DEPTH_QC";
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String references "sea_level";
    String sdn_P02_urn "SDN:P02::AHGT";
    String sdn_parameter_name "Depth below surface of the water body";
    String sdn_parameter_urn "SDN:P01::ADEPZZ01";
    String sdn_uom_name "Metres";
    String sdn_uom_urn "SDN:P06::ULAA";
    String standard_name "depth";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 45.52685, 45.78333;
    String ancillary_variables "POSITION_QC";
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String sdn_P02_urn "SDN:P02::ALAT";
    String sdn_parameter_name "Latitude north";
    String sdn_parameter_urn "SDN:P01::ALATZZ01";
    String sdn_uom_name "Degrees north";
    String sdn_uom_urn "SDN:P06::DEGN";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 13.375, 13.78056;
    String ancillary_variables "POSITION_QC";
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String sdn_P02_urn "SDN:P02::ALAT";
    String sdn_parameter_name "Longitude east";
    String sdn_parameter_urn "SDN:P01::ALONZZ01";
    String sdn_uom_name "Degrees east";
    String sdn_uom_urn "SDN:P06::DEGE";
    String standard_name "longitude";
    String units "degrees_east";
  }
  HCSS {
    Float64 _FillValue -2147.483647;
    String ancillary_variables "QCflag VART_QC";
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Radial variance of current velocity over coverage period";
    String sdn_parameter_name "Speed standard deviation of water current in the water body";
    String sdn_parameter_urn "SDSAZZ01";
    String sdn_uom_name "Square metres per second squared";
    String sdn_uom_urn "SDN:P06::SQM2";
    String units "m2 s-2";
    Float64 valid_max 10.0;
    Float64 valid_min -10.0;
  }
  EACC {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag VART_QC";
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String long_name "Radial accuracy of current velocity over coverage period";
    String sdn_uom_name "Metres per second";
    String sdn_uom_urn "SDN:P06::UVAA";
    String units "m s-1";
    Float64 valid_max 10.0;
    Float64 valid_min -10.0;
  }
  OWTR_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Over Water QC Test - Test applies to each vector. Thresholds=[GeoPandas \"naturalearth_lowres\"]";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Over-water quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  CSPD_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Velocity Threshold QC Test - Test applies to each vector. Threshold=[maximum velocity=1.2 (m/s)]";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Velocity threshold quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  VART_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Variance Threshold QC Test - Test applies to each vector. Threshold=[maximum variance=1.0 (m2/s2)]";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Variance threshold quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  MDFL_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Median Filter QC Test - Test applies to each vector. Thresholds=[distance limit=5.0 (km) velocity-median difference threshold=1.0 (m/s)]";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Median filter quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  AVRB_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Average Radial Bearing QC Test - Test applies to entire file. Thresholds=[minimum bearing=0.0 (degrees) - maximum bearing=360.0 (degrees)]";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Average radial bearing quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  RDCT_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Radial Count QC Test - Test applies to entire file. Threshold=[minimum number of radial vectors=200]";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Radial count quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  QCflag {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Overall QC Flag - Test applies to each vector. Test checks if all QC tests are passed.";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Overall quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  DRVA {
    Float64 _FillValue -2147483.647;
    String ancillary_variables "QCflag OWTR_QC MDFL_QC AVRB_QC RDCT_QC";
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Direction of radial vector away from instrument";
    String sdn_P02_urn "SDN:P02::RFVL";
    String sdn_parameter_name "Direction (from) of radial vector relative to instrument and True North in the water body by high frequency radar";
    String sdn_parameter_urn "SDN:P01::HFRVWD01";
    String sdn_uom_name "Degrees True";
    String sdn_uom_urn "SDN:P06::UABB";
    String standard_name "direction_of_radial_vector_away_from_instrument";
    String units "degree_true";
    Float64 valid_max 360.0;
    Float64 valid_min 0.0;
  }
  RDVA {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag OWTR_QC MDFL_QC CSPD_QC VART_QC RDCT_QC";
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String long_name "Radial sea water velocity away from instrument";
    String sdn_P02_urn "SDN:P02::RFVL";
    String sdn_parameter_name "Speed of water current in the water body by high frequency radar and cell averaging";
    String sdn_parameter_urn "SDN:P01::HFRDCRSP";
    String sdn_uom_name "Metres per second";
    String sdn_uom_urn "SDN:P06::UVAA";
    String standard_name "radial_sea_water_velocity_away_from_instrument";
    String units "m s-1";
    Float64 valid_max 10.0;
    Float64 valid_min -10.0;
  }
  EWCT {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag OWTR_QC MDFL_QC CSPD_QC VART_QC AVRB_QC RDCT_QC";
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String long_name "Surface eastward sea water velocity";
    String sdn_P02_urn "SDN:P02::RFVL";
    String sdn_parameter_name "Eastward velocity of water current in the water body";
    String sdn_parameter_urn "SDN:P01::LCEWZZ01";
    String sdn_uom_name "Metres per second";
    String sdn_uom_urn "SDN:P06::UVAA";
    String standard_name "surface_eastward_sea_water_velocity";
    String units "m s-1";
    Float64 valid_max 10.0;
    Float64 valid_min -10.0;
  }
  NSCT {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag OWTR_QC MDFL_QC CSPD_QC VART_QC AVRB_QC RDCT_QC";
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String long_name "Surface northward sea water velocity";
    String sdn_P02_urn "SDN:P02::RFVL";
    String sdn_parameter_name "Northward current velocity in the water body";
    String sdn_parameter_urn "SDN:P01::LCNSZZ01";
    String sdn_uom_name "Metres per second";
    String sdn_uom_urn "SDN:P06::UVAA";
    String standard_name "surface_northward_sea_water_velocity";
    String units "m s-1";
    Float64 valid_max 10.0;
    Float64 valid_min -10.0;
  }
  POSITION_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Quality flagging for position coordinates.";
    String conventions "EuroGOOS European HFR Node";
    String flag_meanings "no_qc_performed good_data probably_good_data bad_data_that_are_potentially_correctable bad_data value_changed value_below_detection nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
    String long_name "Position quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  NC_GLOBAL {
    String acknowledgement "The HF Radar Network network has been designed,implemented and managed throughthe efforts of OGS-Trieste, ARPA FVG, NIB-Slovenia and ARSO-Slovenia.";
    String area "Mediterranean Sea - Gulf of Trieste (GOT)";
    String calibration_link "branko.cermelj@nib.si; lursella@ogs.it";
    String calibration_type "Full";
    String cdm_data_type "Grid";
    String citation "These data were collected and made freely available by the EuroGOOS European HFR Node. These data was collected and made freely available by OGS, ARPA FVG, NIB and ARSO and the programs that contribute to it. Data is processed by OGS, ARPA FVG, NIB and ARSO.";
    String comment "Total velocities are derived using least square fit that maps radial velocities measured from individual sites onto a cartesian grid. The final product is a map of the horizontal components of the ocean currents on a regular grid in the area of overlap of two or more radar stations.";
    String contributor_email "lursella@ogs.it; branko.cermelj@nib.si; daniela.turk@gov.si;Matjaz.Licer@nib.si; vcardin@ogs.it; dlombardo@ogs.it; ddeponte@ogs.it;simone.martini@arpa.fvg.it; federico.pittaluga@arpa.fvg.it;gbolzon@ogs.it;damir.dezeljin@dezo.org";
    String contributor_name "Laura Ursella; Branko ÄŒermelj; Daniela Turk; MatjaÅ¾ LiÄer; Cardin Vanessa; Davide Lombardo; Deponte Davide; Simone Martini; Federico Pittaluga;Giorgio Bolzon;Damir Dezeljin";
    String contributor_role "Principal investigator; Principal investigator; Principal investigator; investigator; investigator; investigator; radar technician; investigator; radar technician;data manager; data manager;";
    String Conventions "CF-1.11, EuroGOOS European HFR Node, COARDS, ACDD-1.3";
    String creator_email "lorenzo.corgnati@sp.ismar.cnr.it";
    String creator_name "Lorenzo Corgnati";
    String creator_type "person";
    String creator_url "https://www.hfrnode.eu/";
    String data_assembly_center "European HFR Node";
    String data_character_set "utf8";
    String data_language "eng";
    String data_mode "R";
    String data_type "HF radar radial current data";
    String date_created "2026-02-21T09:32:35Z";
    String date_modified "2026-02-21T09:32:35Z";
    String distribution_statement "These data are public and free of charge. User assumes all risk for use of data. User must display citation in any publication or product using data. User must contact PI prior to any commercial use of data.";
    String doa_estimation_method "Beam Forming";
    Float64 Easternmost_Easting 13.78056;
    String format_version "v3";
    Float64 geospatial_lat_max 45.78333;
    Float64 geospatial_lat_min 45.52685;
    Float64 geospatial_lat_resolution 0.013498947368420855;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 13.78056;
    Float64 geospatial_lon_min 13.375;
    Float64 geospatial_lon_resolution 0.019312380952380928;
    String geospatial_lon_units "degrees_east";
    String history 
"Data measured at 2026-02-21T08:30:00Z. netCDF file created at 2026-02-21T09:32:35Z by the European HFR Node.
2026-02-21T20:51:08Z (local files)
2026-02-21T20:51:08Z http://erddap.emodnet-physics.eu/griddap/EUHFR_NRTcurrent_HFR-NAdr-IZOL.das";
    String id "HFR-NAdr-IZOL_2026-02-21T08:30:00Z";
    String infoUrl "https://www.hfrnode.eu/";
    String institution "NIB - Nacionalni inštitut za biologijo";
    String institution_edmo_code "1229";
    String institution_references "https://www.nib.si/mbp/en/oceanographic-data-and-measurements/other-oceanographic-data/hf-radar-2";
    String keywords "accuracy, average, AVRB_QC, away, bearing, biologijo, circulation, count, coverage, CSPD_QC, current, currents, data, depth, direction, direction_of_radial_vector_away_from_instrument, DRVA, EACC, earth, Earth Science > Oceans > Ocean Circulation > Ocean Currents, eastward, EWCT, filter, flag, frequency, HCSS, HF, hf radar, hfr, hfr-nadr-izol, hfradar, high, in\\\\u00c5\\\\u00a1titut, instrument, izol, latitude, longitude, MDFL_QC, median, nacionalni, nadr, near, near real time, nib, northward, NSCT, ocean, ocean currents, oceans, over, over-water, overall, OWTR_QC, period, position, POSITION_QC, QCflag, quality, radar, radial, radial_sea_water_velocity_away_from_instrument, RDCT_QC, RDVA, real, science, scr-hf, sea, seawater, surface, surface water, surface_eastward_sea_water_velocity, surface_northward_sea_water_velocity, threshold, time, variance, VART_QC, vector, velocity, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String last_calibration_date "2023-01-01T00:00:00Z";
    String license "HF radar sea surface current velocity dataset by OGS, NIB and ARSO is licensed under the access to the data and usage are as specified in the SeaDataNet data policy and licence agreement (https://www.seadatanet.org/content/download/1695/file/SeaDataNet%20Data%20Policy.pdf).";
    String manufacturer "WERA";
    String metadata_character_set "utf8";
    String metadata_contact "lorenzo.corgnati@sp.ismar.cnr.it";
    String metadata_date_stamp "2026-02-21T09:32:35Z";
    String metadata_language "eng";
    String naming_authority "eu.hfrnode";
    String netcdf_format "NETCDF4_CLASSIC";
    String netcdf_version "4.9.3";
    String network "GULF OF TRIESTE (GOT)";
    Float64 Northernmost_Northing 45.78333;
    String oceanops_ref "6103606";
    String platform_code "HFR-NAdr-IZOL";
    String processing_level "2B";
    String publisher_email "euhfrnode@azti.es";
    String publisher_name "European HFR Node";
    String publisher_type "institution";
    String publisher_url "https://www.hfrnode.eu/";
    String qc_manual "Recommendation Report 2 on improved common procedures for HFR QC analysis: https://dx.doi.org/10.25607/OBP-944";
    String reference_system "EPSG:4326";
    String references "Recommendation Report 2 on improved common procedures for HFR QC analysis: https://dx.doi.org/10.25607/OBP-944";
    String sensor_model "WERA";
    String site_code "HFR-NAdr";
    String software_name "EU_HFR_NODE_NRTprocessor";
    String software_version "v3";
    String source "coastal structure";
    String source_platform_category_code "17";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 45.52685;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "The data set consists of maps of radial velocity of the sea water surface current collected at Izola (IZOL) site in the Gulf of Trieste (Northern Adriatic Sea). Data are averaged over a time interval of 30 minutes. High Frequency (HF)-RADAR measurements of ocean velocity are radial in direction relative to the radar location and representative of the upper 0.3-2.5 meters of the ocean.";
    String testOutOfDate "now-1day";
    String time_coverage_duration "PT30M";
    String time_coverage_end "2026-02-21T08:30:00Z";
    String time_coverage_resolution "PT30M";
    String time_coverage_start "2022-10-16T00:03:00Z";
    String title "Near Real Time Surface Ocean Radial Velocity by HFR-NAdr-IZOL";
    String topic_category "oceans";
    String update_interval "void";
    Float64 Westernmost_Easting 13.375;
    String wigos_id "0-22000-0-6103606";
    String wmo_platform_code "6103606";
  }
}

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.