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Dataset Title:  HFR - NRT Surface Ocean Velocity by HFR-CALYPSO - 2022-present Subscribe RSS
Institution:  University of Malta; University of Palermo   (Dataset ID: HFR_CALYPSO_Total)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (UTC) ?      3146    1h 22m 31s (uneven)
  < slider >
 depth (m) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      43    0.02703571 (even)
  < slider >
 longitude (degrees_east) ?      51    0.033404 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables) 
 EWCT (West-east current component, m s-1) ?
 NSCT (South-north current component, m s-1) ?
 EWCS (Standard deviation of surface eastward sea water velocity, m s-1) ?
 NSCS (Standard deviation of surface northward sea water velocity, m s-1) ?
 CCOV (Covariance of surface sea water velocity, m2 s-2) ?
 GDOP (Geometrical dilution of precision, 1) ?
 POSITION_QC (Position quality flag, 1) ?
 QCflag (Overall quality flag, 1) ?
 VART_QC (Variance threshold quality flag, 1) ?
 GDOP_QC (GDOP threshold quality flag, 1) ?
 DDNS_QC (Data density threshold quality flag, 1) ?
 CSPD_QC (Velocity threshold quality flag, 1) ?

File type: (more information)

(Documentation / Bypass this form) ?
 
(Please be patient. It may take a while to get the data.)


 

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6698924e+9, 1.6854624e+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";
    Int16 actual_range 0, 0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range 35.74225, 36.87775;
    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";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 13.6949, 15.3651;
    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";
    Float32 valid_max 180.0;
    Float32 valid_min -180.0;
  }
  EWCT {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag, VART_QC, CSPD_QC, DDNS_QC, GDOP_QC";
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordsys "geographic";
    String data_mode "R";
    String ioos_category "Currents";
    String long_name "West-east current component";
    String sdn_P02_urn "SDN:P02::RFVL";
    String sdn_parameter_name "Eastward current velocity 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 "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, VART_QC, CSPD_QC, DDNS_QC, GDOP_QC";
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordsys "geographic";
    String data_mode "R";
    String ioos_category "Currents";
    String long_name "South-north current component";
    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 "northward_sea_water_velocity";
    String units "m s-1";
    Float64 valid_max 10.0;
    Float64 valid_min -10.0;
  }
  EWCS {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag, VART_QC";
    Float64 colorBarMaximum 0.1;
    Float64 colorBarMinimum 0.0;
    String data_mode "R";
    String long_name "Standard deviation of surface eastward sea water velocity";
    String sdn_P02_urn "SDN:P02::RFVL";
    String sdn_parameter_name "Eastward current velocity standard deviation in the water body";
    String sdn_parameter_urn "SDN:P01::SDEWZZZZ";
    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;
  }
  NSCS {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag, VART_QC";
    Float64 colorBarMaximum 0.1;
    Float64 colorBarMinimum 0.0;
    String data_mode "R";
    String long_name "Standard deviation of surface northward sea water velocity";
    String sdn_P02_urn "SDN:P02::RFVL";
    String sdn_parameter_name "Northward current velocity standard deviation in the water body";
    String sdn_parameter_urn "SDN:P01::SDNSZZZZ";
    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;
  }
  CCOV {
    Float64 _FillValue -2147.483647;
    String ancillary_variables "QCflag";
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String data_mode "R";
    String long_name "Covariance of surface sea water velocity";
    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;
  }
  GDOP {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag, GDOP_QC";
    Float64 colorBarMaximum 0.1;
    Float64 colorBarMinimum 0.0;
    String comment "The Geometric Dilution of Precision (GDOP) is the coefficient of the uncertainty, which relates the uncertainties in radial and velocity vectors. The GDOP is a unit-less coefficient, which characterizes the effect that radar station geometry has on the measurement and position determination errors. A low GDOP corresponds to an optimal geometric configuration of radar stations, and results in accurate surface current data. Essentially, GDOP is a quantitative way to relate the radial and velocity vector uncertainties. Setting a threshold on GDOP for total combination avoids the combination of radials with an intersection angle below a certain value. GDOP is a useful metric for filtering errant velocities due to poor geometry.";
    String data_mode "R";
    String long_name "Geometrical dilution of precision";
    String sdn_uom_name "Dimensionless";
    String sdn_uom_urn "SDN:P06::UUUU";
    String units "1";
    Float64 valid_max 20.0;
    Float64 valid_min -20.0;
  }
  POSITION_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "OceanSITES quality flagging for position coordinates.";
    String conventions "Copernicus Marine In Situ reference table 2";
    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;
  }
  QCflag {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "OceanSITES quality flagging for all QC tests.";
    String conventions "Copernicus Marine In Situ reference table 2";
    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;
  }
  VART_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "OceanSITES quality flagging for variance threshold QC test. Test not applicable to Direction Finding systems. The Temporal Derivative test is applied.Threshold set to 1 m/s.";
    String conventions "Copernicus Marine In Situ reference table 2";
    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;
  }
  GDOP_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "OceanSITES quality flagging for GDOP threshold QC test. Threshold set to 20.";
    String conventions "Copernicus Marine In Situ reference table 2";
    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 "GDOP threshold quality flag";
    String units "1";
    Byte valid_max 9;
    Byte valid_min 0;
  }
  DDNS_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "OceanSITES quality flagging for Data density threshold QC test. Threshold set to 3 radials.";
    String conventions "Copernicus Marine In Situ reference table 2";
    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 "Data density threshold 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 "OceanSITES quality flagging for Velocity threshold QC test. Threshold set to 1 m/s.";
    String conventions "Copernicus Marine In Situ reference table 2";
    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;
  }
  NC_GLOBAL {
    String acknowledgement "Surface current data were obtained by the HF radar network installed as part of the CALYPSO, CALYPSO FollowOn, and CALYPSO SOUTH projects under partial sponsorship of the EU Operational Programme Italiaâ\\u0080\\u0091Malta 2007â\\u0080\\u00912013. The network is managed by the University of Malta (Dr Adam Gauci) and by the University of Palermo (Prof. Giuseppe Ciraolo and Dr Fulvio Capodici). More information can be obtained from: http://calypsosouth.eu";
    String area "Malta Channel";
    String calibration_link "CENC: adam.gauci@um.edu.mt; LAPS: adam.gauci@um.edu.mt; SOPU: adam.gauci@um.edu.mt; BARK: adam.gauci@um.edu.mt";
    String calibration_type "CENC: APM; LAPS: APM; SOPU: APM; BARK: APM";
    String cdm_data_type "Grid";
    String citation "These data were collected and made freely available by the Copernicus project and the programs that contribute to it. Surface current data were obtained by the HF radar network installed as part of the CALYPSO, CALYPSO FollowOn, and CALYPSO SOUTH projects under partial sponsorship of the EU Operational Programme Italiaâ€'Malta 2007â€'2013. The network is managed by the University of Malta (Dr Adam Gauci) and by the University of Palermo (Prof. Giuseppe Ciraolo and Dr Fulvio Capodici). More information can be obtained from: http://calypsosouth.eu";
    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 contact "euhfrnode@azti.es";
    String contributor_email "adam.gauci@um.edu.mt; giuseppe.ciraolo@unipa.it; fulvio.capodici@unipa.it";
    String contributor_name "Adam Gauci; Giuseppe Ciraolo; Fulvio Capodici";
    String contributor_role "Project manager; Project manager; Project manager;";
    String Conventions "CF-1.6 Copernicus-InSituTAC-FormatManual-1.42 Copernicus-InSituTAC-SRD-1.5 Copernicus-InSituTAC-ParametersList-3.2.1, COARDS, ACDD-1.3";
    String creator_name "EUHFRNODE";
    String data_assembly_center "European HFR Node";
    String data_assembly_center_email "euhfrnode@azti.es";
    String data_character_set "utf8";
    String data_language "eng";
    String data_model_reference "http://www.marineinsitu.eu/wp-content/uploads/2018/02/HFR_Data_Model_Reference_Card_v1.pdf";
    String data_type "HF radar total data";
    String distribution_statement "These data follow Copernicus standards; they 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 "CENC: Direction Finding; LAPS: Direction Finding; SOPU: Direction Finding; BARK: Direction Finding";
    Float64 Easternmost_Easting 15.3651;
    String feature_type "surface";
    Float64 geospatial_lat_max 36.87775;
    Float64 geospatial_lat_min 35.74225;
    Float64 geospatial_lat_resolution 0.027035714285714295;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 15.3651;
    Float64 geospatial_lon_min 13.6949;
    Float64 geospatial_lon_resolution 0.03340399999999999;
    String geospatial_lon_units "degrees_east";
    String grid_mapping_epsg_code "EPSG:4326";
    Float64 grid_mapping_inverse_flattening 298.257223563;
    String grid_mapping_name "latitude_longitude";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    String grid_resolution "3";
    String history 
"2023-05-30T18:53:14Z https://thredds.hfrnode.eu:8443/thredds/dodsC/EUHFR_NRTcurrent_HFR-CALYPSO-Total_v2.2
2023-05-30T18:53:14Z https://erddap.emodnet-physics.eu/erddap/griddap/HFR_CALYPSO_Total.das";
    String infoUrl "https://www.calypsosouth.eu/ https://www.unipa.it/";
    String institution "University of Malta; University of Palermo";
    String institution_edmo_code "708 1051";
    String institution_references "https://www.calypsosouth.eu/ https://www.unipa.it/";
    String keywords "calypso, CCOV, circulation, component, covariance, CSPD_QC, current, currents, data, DDNS_QC, density, depth, deviation, dilution, earth, Earth Science > Oceans > Ocean Circulation > Ocean Currents, east, eastward, eastward_sea_water_velocity, euhfr, EWCS, EWCT, flag, frequency, gdop, GDOP_QC, geometrical, HF, hf radar, hfr, hfr-calypso, hfr-calypso-total, hfradar, high, latitude, longitude, malta, near, near real time, north, northward, northward_sea_water_velocity, nrtcurrent, NSCS, NSCT, ocean, ocean currents, oceans, overall, palermo, position, POSITION_QC, precision, QCflag, quality, radar, real, science, scr-hf, sea, seawater, south, south-north, standard, surface, surface water, threshold, time, total, university, v2.2, variance, VART_QC, velocity, water, west, west-east";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "HF radar sea surface current velocity dataset is licensed under a Creative Commons Attribution 4.0 International License. You should have received a copy of the license along with this work. If not, see https://creativecommons.org/licenses/by/4.0/";
    String metadata_character_set "utf8";
    String metadata_contact "lorenzo.corgnati@sp.ismar.cnr.it";
    String metadata_language "eng";
    String netcdf_format "netcdf4_classic";
    String network "HFR-CALYPSO";
    Float64 Northernmost_Northing 36.87775;
    String owner "University of Malta; University of Palermo";
    String platform_code "HFR-CALYPSO-Total";
    String processing_level "3B";
    String project "CALYPSO, CALYPSO FO, CALYPSO SOUTH";
    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:4806";
    String references "http://marine.copernicus.eu http://www.marineinsitu.eu http://www.marineinsitu.eu/wp-content/uploads/2018/02/HFR_Data_Model_Reference_Card_v1.pdf";
    String sensor "CODAR SeaSonde";
    String site_code "HFR-CALYPSO";
    String sourceUrl "https://thredds.hfrnode.eu:8443/thredds/dodsC/EUHFR_NRTcurrent_HFR-CALYPSO-Total_v2.2";
    Float64 Southernmost_Northing 35.74225;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "The data set consists of real-time continuous coastal ocean surface current maps in the Malta Channel (Western Mediterranean) averaged over a time interval of 1 hour around the cardinal hour, measured by the coastal High-Frequency Radars. Surface ocean velocities estimated by HF Radar are representative of the upper upper 0.3â\\u0080\\u00912.5 meters of the ocean.";
    String testOutOfDate "now-1day";
    String time_coverage_duration "PT1H";
    String time_coverage_end "2023-05-30T16:00:00Z";
    String time_coverage_resolution "PT1H";
    String time_coverage_start "2022-12-01T11:00:00Z";
    String title "HFR - NRT Surface Ocean Velocity by HFR-CALYPSO - 2022-present";
    String vocablaries "SDN_P01";
    Float64 Westernmost_Easting 13.6949;
  }
}

 

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.

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.


 
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