ERDDAP > griddap > Data Access Form

Dataset Title:	Near Real Time Surface Ocean Total Velocity by HFR-US-EastGulfCoast-Total
Institution:	NOAA-NDBC, TAMU, ODU, URI, SKIO, UMiami, UNC, WHOI, UMaine, SC, USF, U.Conn, FAU, USM, UMassDart   (Dataset ID: EUHFR_NRTcurrent_HFR-US-EastGulfCoast-Total)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Files | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (UTC)				57483	1h 3m 54s (uneven)
depth (m)				1	(just one value)
latitude (degrees_north)				458	0.05408788 (uneven)
longitude (degrees_east)				626	0.06503366 (even)

Grid Variables (which always also download all of the dimension variables)

GDOP (Geometrical dilution of precision, 1)

DDNS_QC (Data density threshold quality flag, 1)

CSPD_QC (Velocity threshold quality flag, 1)

VART_QC (Variance threshold quality flag, 1)

GDOP_QC (GDOP threshold quality flag, 1)

QCflag (Overall quality flag, 1)

EWCT (Surface eastward sea water velocity, m s-1)

NSCT (Surface northward sea water velocity, 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)

POSITION_QC (Position quality flag, 1)

File type: (more information) .largePdf - View a large .pdf image file with a graph or map. .pdf - View a standard, medium-sized .pdf image file with a graph or map. .nccsv - Download a NetCDF-3-like 7-bit ASCII NCCSV .csv file with COARDS/CF/ACDD metadata. .ncml - View the dataset's structure and metadata as a UTF-8 NCML .xml file. .esriAscii - Download an ISO-8859-1 ESRI ASCII file (latitude longitude data only; longitude must be all below or all above 180). .kml - View a Google Earth .kml file (for latitude, longitude data only). .csv0 - Download a ISO-8859-1 .csv file without column names or units. Times are ISO 8601 strings. .csv - Download a ISO-8859-1 comma-separated text table (line 1: names; line 2: units; ISO 8601 times). .xhtml - View a UTF-8 XHTML (XML) file with the data in a table. Times are ISO 8601 strings. .htmlTable - View a UTF-8 .html web page with the data in a table. Times are ISO 8601 strings. .ncoJson - Download a UTF-8 NCO lvl=2 JSON file with COARDS/CF/ACDD metadata. .ncHeader - View the UTF-8 header (the metadata) for the NetCDF-3 .nc file. .geotif - View a grayscale GeoTIFF .tif file (for latitude longitude data; longitude must be all below or all above 180). .parquet - Download as a parquet file. Metadata contains column names ("column_names") and units ("column_units"). .nc - Download a NetCDF-3 binary file with COARDS/CF/ACDD metadata. .asc - View OPeNDAP-style ISO-8859-1 comma-separated text. .jsonlCSV1 - View a UTF-8 JSON Lines CSV file with column names on line 1 (mv = 'null'; times are ISO 8601 strings). .csvp - Download a ISO-8859-1 .csv file with line 1: name (units). Times are ISO 8601 strings. .json - View a table-like UTF-8 JSON file (missing value = 'null'; times are ISO 8601 strings). .smallPng - View a small .png image file with a graph or map. .fgdc - View the dataset's UTF-8 FGDC .xml metadata. .tsv0 - Download a ISO-8859-1 .tsv file without column names or units. Times are ISO 8601 strings. .itx - Download an ISO-8859-1 Igor Text File. Each axis variable and each data variable becomes a wave. .wav - Download a .wav audio file. All columns must be numeric and of the same type. .odvTxt - Download time,latitude,longitude,otherVariables as an ODV Generic Spreadsheet File (.txt). .largePng - View a large .png image file with a graph or map. .png - View a standard, medium-sized .png image file with a graph or map. .smallPdf - View a small .pdf image file with a graph or map. .timeGaps - View a UTF-8 list of gaps in the time values which are larger than the median gap. .iso19115 - View the dataset's ISO 19115-2/19139 UTF-8 .xml metadata. .parquetWMeta - Download as a parquet file. Metadata contains column names ("column_names") and units ("column_units"). .mat - Download a MATLAB binary file. .nccsvMetadata - View the dataset's metadata as the top half of a 7-bit ASCII NCCSV .csv file. .jsonlCSV - View a UTF-8 JSON Lines CSV file without column names (mv = 'null'; times are ISO 8601 strings). .jsonlKVP - View a UTF-8 JSON Lines file with Key:Value pairs (missing value = 'null'; times are ISO 8601 strings). .tsv - Download a ISO-8859-1 tab-separated text table (line 1: names; line 2: units; ISO 8601 times). .dods - OPeNDAP clients use this to download the data in the DODS binary format. .das - View the dataset's metadata via an ISO-8859-1 OPeNDAP Dataset Attribute Structure (DAS). .transparentPng - View a .png image file (just the data, without axes, landmask, or legend). .tsvp - Download a ISO-8859-1 .tsv file with line 1: name (units). Times are ISO 8601 strings. .dds - View the dataset's structure via an ISO-8859-1 OPeNDAP Dataset Descriptor Structure (DDS).

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.5436224e+9, 1.7640288e+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 21.75611, 46.47427;
    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 -97.88055, -57.23451;
    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";
  }
  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 long_name "Geometrical dilution of precision";
    String sdn_parameter_name "Dilution of precision";
    String sdn_parameter_urn "SDN:S06::S0600236";
    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;
  }
  DDNS_QC {
    Byte _FillValue -127;
    String _Unsigned "false";
    Float64 colorBarMaximum 10.0;
    Float64 colorBarMinimum 0.0;
    String comment "Data Density Threshold QC Test - Test applies to each vector. Threshold=[minimum number of contributing radial velocities=3]";
    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 "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 "Velocity Threshold QC Test - Test applies to each vector. Threshold=[maximum velocity=5.0 (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 "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 not applicable to Direction Finding systems. Temporal Derivative QC Test - Test applies to each vector. Threshold=[velocity difference threshold=2.0 (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 "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 "GDOP Threshold QC Test - Test applies to each vector. Threshold=[GDOP threshold=2.0]";
    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 "GDOP threshold 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;
  }
  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 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 VART_QC CSPD_QC DDNS_QC GDOP_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;
  }
  EWCS {
    Float64 _FillValue -32.767;
    String ancillary_variables "QCflag VART_QC";
    Float64 colorBarMaximum 0.1;
    Float64 colorBarMinimum 0.0;
    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 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 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;
  }
  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 "HFR-US-EastGulfCoast HF Radar Network has been established within the Integrated Ocean Observing System (IOOS) program.";
    String area "US East Coast and Gulf of Mexico";
    String calibration_link "AMAG: hfrnet.administrators@sio.ucsd.edu, ANWR: hfrnet.administrators@sio.ucsd.edu, ASSA: hfrnet.administrators@sio.ucsd.edu, BISL: hfrnet.administrators@sio.ucsd.edu, BLCK: hfrnet.administrators@sio.ucsd.edu, BRAD: hfrnet.administrators@sio.ucsd.edu, BRIG: hfrnet.administrators@sio.ucsd.edu, BRMR: hfrnet.administrators@sio.ucsd.edu, BRNT: hfrnet.administrators@sio.ucsd.edu, CAPE: hfrnet.administrators@sio.ucsd.edu, CAT : hfrnet.administrators@sio.ucsd.edu, CDN : hfrnet.administrators@sio.ucsd.edu, CEDR: hfrnet.administrators@sio.ucsd.edu, CLMH: hfrnet.administrators@sio.ucsd.edu, CMPT: hfrnet.administrators@sio.ucsd.edu, CORE: hfrnet.administrators@sio.ucsd.edu, CPLF: hfrnet.administrators@sio.ucsd.edu, CPVN: hfrnet.administrators@sio.ucsd.edu, CSTM: hfrnet.administrators@sio.ucsd.edu, CSW : hfrnet.administrators@sio.ucsd.edu, DUCK: hfrnet.administrators@sio.ucsd.edu, FDS : hfrnet.administrators@sio.ucsd.edu, FLND: hfrnet.administrators@sio.ucsd.edu, GCAP: hfrnet.administrators@sio.ucsd.edu, GMNB: hfrnet.administrators@sio.ucsd.edu, GRNI: hfrnet.administrators@sio.ucsd.edu, GTN : hfrnet.administrators@sio.ucsd.edu, HATY: hfrnet.administrators@sio.ucsd.edu, HAUL: hfrnet.administrators@sio.ucsd.edu, HBSP: hfrnet.administrators@sio.ucsd.edu, HBSR: hfrnet.administrators@sio.ucsd.edu, HEMP: hfrnet.administrators@sio.ucsd.edu, HILL: hfrnet.administrators@sio.ucsd.edu, HLPN: hfrnet.administrators@sio.ucsd.edu, HOOK: hfrnet.administrators@sio.ucsd.edu, JEK : hfrnet.administrators@sio.ucsd.edu, LISL: hfrnet.administrators@sio.ucsd.edu, LOVE: hfrnet.administrators@sio.ucsd.edu, LPWR: hfrnet.administrators@sio.ucsd.edu, MARA: hfrnet.administrators@sio.ucsd.edu, MBNP: hfrnet.administrators@sio.ucsd.edu, METS: hfrnet.administrators@sio.ucsd.edu, MISQ: hfrnet.administrators@sio.ucsd.edu, MNTK: hfrnet.administrators@sio.ucsd.edu, MRCH: hfrnet.administrators@sio.ucsd.edu, MVCO: hfrnet.administrators@sio.ucsd.edu, NANT: hfrnet.administrators@sio.ucsd.edu, NAPL: hfrnet.administrators@sio.ucsd.edu, NAUS: hfrnet.administrators@sio.ucsd.edu, NKL : hfrnet.administrators@sio.ucsd.edu, NWTP: hfrnet.administrators@sio.ucsd.edu, OBSP: hfrnet.administrators@sio.ucsd.edu, OLDB: hfrnet.administrators@sio.ucsd.edu, PCYC: hfrnet.administrators@sio.ucsd.edu, PINS: hfrnet.administrators@sio.ucsd.edu, PORT: hfrnet.administrators@sio.ucsd.edu, PTWN: hfrnet.administrators@sio.ucsd.edu, RATH: hfrnet.administrators@sio.ucsd.edu, RDSR: hfrnet.administrators@sio.ucsd.edu, RLVR: hfrnet.administrators@sio.ucsd.edu, SCOV: hfrnet.administrators@sio.ucsd.edu, SEAB: hfrnet.administrators@sio.ucsd.edu, SGRV: hfrnet.administrators@sio.ucsd.edu, SILD: hfrnet.administrators@sio.ucsd.edu, SISL: hfrnet.administrators@sio.ucsd.edu, SPRK: hfrnet.administrators@sio.ucsd.edu, SQUB: hfrnet.administrators@sio.ucsd.edu, SSDE: hfrnet.administrators@sio.ucsd.edu, STF : hfrnet.administrators@sio.ucsd.edu, STLI: hfrnet.administrators@sio.ucsd.edu, SUNS: hfrnet.administrators@sio.ucsd.edu, SWPP: hfrnet.administrators@sio.ucsd.edu, VEN : hfrnet.administrators@sio.ucsd.edu, VENI: hfrnet.administrators@sio.ucsd.edu, VIEW: hfrnet.administrators@sio.ucsd.edu, VIR : hfrnet.administrators@sio.ucsd.edu, WILD: hfrnet.administrators@sio.ucsd.edu, WOOD: hfrnet.administrators@sio.ucsd.edu";
    String calibration_type "AMAG: APM, ANWR: APM, ASSA: APM, BISL: APM, BLCK: APM, BRAD: APM, BRIG: APM, BRMR: APM, BRNT: APM, CAPE: APM, CAT : Full, CDN : Full, CEDR: APM, CLMH: APM, CMPT: APM, CORE: APM, CPLF: APM, CPVN: APM, CSTM: APM, CSW : Full, DUCK: APM, FDS : Full, FLND: APM, GCAP: APM, GMNB: APM, GRNI: APM, GTN : Full, HATY: APM, HAUL: APM, HBSP: APM, HBSR: APM, HEMP: APM, HILL: APM, HLPN: APM, HOOK: APM, JEK : Full, LISL: APM, LOVE: APM, LPWR: APM, MARA: APM, MBNP: APM, METS: APM, MISQ: APM, MNTK: APM, MRCH: APM, MVCO: APM, NANT: APM, NAPL: APM, NAUS: APM, NKL : Full, NWTP: APM, OBSP: APM, OLDB: APM, PCYC: APM, PINS: APM, PORT: APM, PTWN: APM, RATH: APM, RDSR: APM, RLVR: APM, SCOV: APM, SEAB: APM, SGRV: APM, SILD: APM, SISL: APM, SPRK: APM, SQUB: APM, SSDE: APM, STF : Full, STLI: APM, SUNS: APM, SWPP: APM, VEN : Full, VENI: APM, VIEW: APM, VIR : Full, WILD: APM, WOOD: APM";
    String cdm_data_type "Grid";
    String citation "These data were collected and made freely available by the EuroGOOS European HFR Node. Data collected and processed by NOAA-NDBC.";
    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 "brian.zelenke@noaa.gov; hfrnet.administrators@sio.ucsd.edu; hfrnet.administrators@sio.ucsd.edu; hfrnet.administrators@sio.ucsd.edu";
    String contributor_name "Brian Zelenke; Lisa Hazard; Hugh Roarty; Mark Otero";
    String contributor_role "Program Manager; HFR expert; HFR expert; HFR expert";
    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 total current data";
    String date_created "2025-11-25T01:22:27Z";
    String date_modified "2025-11-25T01:22:27Z";
    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 "AMAG: Direction Finding, ANWR: Direction Finding, ASSA: Direction Finding, BISL: Direction Finding, BLCK: Direction Finding, BRAD: Direction Finding, BRIG: Direction Finding, BRMR: Direction Finding, BRNT: Direction Finding, CAPE: Direction Finding, CAT : Beam Forming, CDN : Beam Forming, CEDR: Direction Finding, CLMH: Direction Finding, CMPT: Direction Finding, CORE: Direction Finding, CPLF: Direction Finding, CPVN: Direction Finding, CSTM: Direction Finding, CSW : Beam Forming, DUCK: Direction Finding, FDS : Beam Forming, FLND: Direction Finding, GCAP: Direction Finding, GMNB: Direction Finding, GRNI: Direction Finding, GTN : Beam Forming, HATY: Direction Finding, HAUL: Direction Finding, HBSP: Direction Finding, HBSR: Direction Finding, HEMP: Direction Finding, HILL: Direction Finding, HLPN: Direction Finding, HOOK: Direction Finding, JEK : Beam Forming, LISL: Direction Finding, LOVE: Direction Finding, LPWR: Direction Finding, MARA: Direction Finding, MBNP: Direction Finding, METS: Direction Finding, MISQ: Direction Finding, MNTK: Direction Finding, MRCH: Direction Finding, MVCO: Direction Finding, NANT: Direction Finding, NAPL: Direction Finding, NAUS: Direction Finding, NKL : Beam Forming, NWTP: Direction Finding, OBSP: Direction Finding, OLDB: Direction Finding, PCYC: Direction Finding, PINS: Direction Finding, PORT: Direction Finding, PTWN: Direction Finding, RATH: Direction Finding, RDSR: Direction Finding, RLVR: Direction Finding, SCOV: Direction Finding, SEAB: Direction Finding, SGRV: Direction Finding, SILD: Direction Finding, SISL: Direction Finding, SPRK: Direction Finding, SQUB: Direction Finding, SSDE: Direction Finding, STF : Beam Forming, STLI: Direction Finding, SUNS: Direction Finding, SWPP: Direction Finding, VEN : Beam Forming, VENI: Direction Finding, VIEW: Direction Finding, VIR : Beam Forming, WILD: Direction Finding, WOOD: Direction Finding";
    Float64 Easternmost_Easting -57.23451;
    String format_version "v3";
    Float64 geospatial_lat_max 46.47427;
    Float64 geospatial_lat_min 21.75611;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -57.23451;
    Float64 geospatial_lon_min -97.88055;
    Float64 geospatial_lon_resolution 0.065033664;
    String geospatial_lon_units "degrees_east";
    String history 
"Data collected at 2025-11-25T00:00:00Z. netCDF file created at 2025-11-25T01:22:27Z by the European HFR Node.
2026-02-21T20:54:29Z (local files)
2026-02-21T20:54:29Z http://erddap.emodnet-physics.eu/erddap/griddap/EUHFR_NRTcurrent_HFR-US-EastGulfCoast-Total.das";
    String id "HFR-US-EastGulfCoast-Total_2025-11-25T00:00:00Z";
    String infoUrl "https://www.hfrnode.eu/";
    String institution "NOAA-NDBC, TAMU, ODU, URI, SKIO, UMiami, UNC, WHOI, UMaine, SC, USF, U.Conn, FAU, USM, UMassDart";
    String institution_edmo_code "1463, 1435, 3814, 3806, 3833, 1465, 3829, 4955, 3660, 3399, 3844, 3827, 3835, 3838, 3824, 3543, 3837, 3653";
    String institution_references "https://www.ndbc.noaa.gov/, https://marine.rutgers.edu/, https://www.tamu.edu/, https://www.odu.edu/, http://www.uri.edu/, https://www.skio.uga.edu/, https://welcome.miami.edu/, http://meopar.ca/, https://www.unc.edu/, http://www.fugrogeoconsulting.com/, https://www.whoi.edu/, https://umaine.edu/, http://www.sc.edu/, https://www.usf.edu/, https://uconn.edu/, http://fau.edu/, https://www.usm.edu/, http://www.umassd.edu/";
    String keywords "buoy, CCOV, center, circulation, covariance, CSPD_QC, currents, data, DDNS_QC, density, depth, deviation, dilution, earth, Earth Science > Oceans > Ocean Circulation > Ocean Currents, eastgulfcoast, eastward, EWCS, EWCT, fau, flag, florida, frequency, gdop, GDOP_QC, geometrical, HF, hf radar, hfr, hfr-us-eastgulfcoast-total, hfradar, high, hole, institution, latitude, longitude, national, ndbc, near, near real time, noaa, noaa-ndbc, northward, nrt, NSCS, NSCT, ocean, ocean currents, oceanographic, oceans, odu, overall, position, POSITION_QC, precision, QCflag, quality, radar, real, science, scr-hf, sea, seawater, skio, south, standard, surface, surface water, surface_eastward_sea_water_velocity, surface_northward_sea_water_velocity, tamu, threshold, time, total, u.conn, umaine, umassdart, umiami, unc, university, usf, usm, variance, VART_QC, velocity, water, whoi, woods";
    String keywords_vocabulary "GCMD Science Keywords";
    String last_calibration_date "AMAG: N/A, ANWR: N/A, ASSA: N/A, BISL: N/A, BLCK: N/A, BRAD: N/A, BRIG: N/A, BRMR: N/A, BRNT: N/A, CAPE: N/A, CAT : N/A, CDN : N/A, CEDR: N/A, CLMH: N/A, CMPT: N/A, CORE: N/A, CPLF: N/A, CPVN: N/A, CSTM: N/A, CSW : N/A, DUCK: N/A, FDS : N/A, FLND: N/A, GCAP: N/A, GMNB: N/A, GRNI: N/A, GTN : N/A, HATY: N/A, HAUL: N/A, HBSP: N/A, HBSR: N/A, HEMP: N/A, HILL: N/A, HLPN: N/A, HOOK: N/A, JEK : N/A, LISL: N/A, LOVE: N/A, LPWR: N/A, MARA: N/A, MBNP: N/A, METS: N/A, MISQ: N/A, MNTK: N/A, MRCH: N/A, MVCO: N/A, NANT: N/A, NAPL: N/A, NAUS: N/A, NKL : N/A, NWTP: N/A, OBSP: N/A, OLDB: N/A, PCYC: N/A, PINS: N/A, PORT: N/A, PTWN: N/A, RATH: N/A, RDSR: N/A, RLVR: N/A, SCOV: N/A, SEAB: N/A, SGRV: N/A, SILD: N/A, SISL: N/A, SPRK: N/A, SQUB: N/A, SSDE: N/A, STF : N/A, STLI: N/A, SUNS: N/A, SWPP: N/A, VEN : N/A, VENI: N/A, VIEW: N/A, VIR : N/A, WILD: N/A, WOOD: N/A";
    String license "HF radar sea surface current velocity dataset by NOAA-NDBC 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 manufacturer "AMAG: Codar, ANWR: Codar, ASSA: Codar, BISL: Codar, BLCK: Codar, BRAD: Codar, BRIG: Codar, BRMR: Codar, BRNT: Codar, CAPE: Codar, CAT : WERA, CDN : WERA, CEDR: Codar, CLMH: Codar, CMPT: Codar, CORE: Codar, CPLF: Codar, CPVN: UH LERA, CSTM: Codar, CSW : WERA, DUCK: Codar, FDS : WERA, FLND: Codar, GCAP: Codar, GMNB: Codar, GRNI: Codar, GTN : WERA, HATY: Codar, HAUL: Codar, HBSP: Codar, HBSR: UH LERA, HEMP: Codar, HILL: Codar, HLPN: Codar, HOOK: Codar, JEK : WERA, LISL: Codar, LOVE: Codar, LPWR: UH LERA, MARA: Codar, MBNP: Codar, METS: Codar, MISQ: Codar, MNTK: Codar, MRCH: Codar, MVCO: Codar, NANT: Codar, NAPL: Codar, NAUS: Codar, NKL : WERA, NWTP: UH LERA, OBSP: Codar, OLDB: Codar, PCYC: Codar, PINS: Codar, PORT: Codar, PTWN: Codar, RATH: Codar, RDSR: Codar, RLVR: Codar, SCOV: Codar, SEAB: Codar, SGRV: Codar, SILD: Codar, SISL: Codar, SPRK: Codar, SQUB: Codar, SSDE: Codar, STF : WERA, STLI: Codar, SUNS: Codar, SWPP: Codar, VEN : WERA, VENI: Codar, VIEW: Codar, VIR : WERA, WILD: Codar, WOOD: Codar";
    String metadata_character_set "utf8";
    String metadata_contact "lorenzo.corgnati@sp.ismar.cnr.it";
    String metadata_date_stamp "2025-11-25T01:22:27Z";
    String metadata_language "eng";
    String naming_authority "eu.hfrnode";
    String netcdf_format "NETCDF4_CLASSIC";
    String netcdf_version "4.9.3";
    String network "HFR_US_EastGulfCoast";
    Float64 Northernmost_Northing 46.47427;
    String platform_code "HFR-US-EastGulfCoast-Total";
    String processing_level "3B";
    String project "Integrated Ocean Observing System (IOOS)";
    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 "AMAG: Codar, ANWR: Codar, ASSA: Codar, BISL: Codar, BLCK: Codar, BRAD: Codar, BRIG: Codar, BRMR: Codar, BRNT: Codar, CAPE: Codar, CAT : WERA, CDN : WERA, CEDR: Codar, CLMH: Codar, CMPT: Codar, CORE: Codar, CPLF: Codar, CPVN: UH LERA, CSTM: Codar, CSW : WERA, DUCK: Codar, FDS : WERA, FLND: Codar, GCAP: Codar, GMNB: Codar, GRNI: Codar, GTN : WERA, HATY: Codar, HAUL: Codar, HBSP: Codar, HBSR: UH LERA, HEMP: Codar, HILL: Codar, HLPN: Codar, HOOK: Codar, JEK : WERA, LISL: Codar, LOVE: Codar, LPWR: UH LERA, MARA: Codar, MBNP: Codar, METS: Codar, MISQ: Codar, MNTK: Codar, MRCH: Codar, MVCO: Codar, NANT: Codar, NAPL: Codar, NAUS: Codar, NKL : WERA, NWTP: UH LERA, OBSP: Codar, OLDB: Codar, PCYC: Codar, PINS: Codar, PORT: Codar, PTWN: Codar, RATH: Codar, RDSR: Codar, RLVR: Codar, SCOV: Codar, SEAB: Codar, SGRV: Codar, SILD: Codar, SISL: Codar, SPRK: Codar, SQUB: Codar, SSDE: Codar, STF : WERA, STLI: Codar, SUNS: Codar, SWPP: Codar, VEN : WERA, VENI: Codar, VIEW: Codar, VIR : WERA, WILD: Codar, WOOD: Codar";
    String site_code "HFR-US-EastGulfCoast";
    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 21.75611;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Surface ocean velocities estimated from High Frequency (HF)-Radar are representative of the upper 2.4 meters of the ocean.  The main objective of near-real time processing is to produce the best product from available data at the time of processing.  Radial velocity measurements are obtained from individual radar sites through the U.S. HF-Radar Network. Hourly radial data are processed by unweighted least squares on a 6km resolution grid of the U.S. East and Gulf Coast to produce near real-time surface current maps.";
    String testOutOfDate "now-46days";
    String time_coverage_duration "PT1H";
    String time_coverage_end "2025-11-25T00:00:00Z";
    String time_coverage_resolution "PT1H";
    String time_coverage_start "2018-12-01T00:00:00Z";
    String title "Near Real Time Surface Ocean Total Velocity by HFR-US-EastGulfCoast-Total";
    String topic_category "oceans";
    String update_interval "void";
    Float64 Westernmost_Easting -97.88055;
  }
}

 

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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 Data Access Protocol (DAP) and its projection constraints.

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.

 

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