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Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL _NCProperties String version=2,netcdf=4.7.4,hdf5=1.10.6
attribute NC_GLOBAL acknowledgement String HFR-US-Alaska HF Radar Network has been established within the Integrated Ocean Observing System (IOOS) program.
attribute NC_GLOBAL area String Alaska Coast and North Slope
attribute NC_GLOBAL calibration_link String PBRW: hfrnet.administrators@sio.ucsd.edu; SIMP: hfrnet.administrators@sio.ucsd.edu; VDIG: hfrnet.administrators@sio.ucsd.edu; VRID: hfrnet.administrators@sio.ucsd.edu; WAIN: hfrnet.administrators@sio.ucsd.edu
attribute NC_GLOBAL calibration_type String PBRW: APM; SIMP: APM; VDIG: APM; VRID: APM; WAIN: APM
attribute NC_GLOBAL cdm_data_type String Grid
attribute NC_GLOBAL citation String These data were collated within the Copernicus Marine Service (In Situ) and EMODnet collaboration framework. Data is made freely available by the Copernicus Marine Service and the programs that contribute to it. Data collected and processed by CORDC.
attribute NC_GLOBAL comment String 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.
attribute NC_GLOBAL Conventions String CF-1.6 Jerico-Next-deliverable-D5.14 Copernicus-InSituTAC-Manual-1.0 Copernicus-InSituTAC-SRD-1.4 Copernicus-InSituTAC-ParametersList-3.1.0, COARDS, ACDD-1.3
attribute NC_GLOBAL creator_email String lorenzo.corgnati at sp.ismar.cnr.it
attribute NC_GLOBAL creator_name String UAF; ONC; CORDC - Coastal Observing Research and Development Center
attribute NC_GLOBAL creator_type String group
attribute NC_GLOBAL creator_url String https://www.hfrnode.eu/ (external link)
attribute NC_GLOBAL data_mode String R
attribute NC_GLOBAL date_created String 2023-11-18T08:07:14Z
attribute NC_GLOBAL date_modified String 2023-11-18T20:48:08Z
attribute NC_GLOBAL doa_estimation_method String PBRW: Direction Finding; SIMP: Direction Finding; VDIG: Direction Finding; VRID: Direction Finding; WAIN: Direction Finding
attribute NC_GLOBAL Easternmost_Easting double -128.6599
attribute NC_GLOBAL format_version String 2.0
attribute NC_GLOBAL geospatial_lat_max double 74.0321
attribute NC_GLOBAL geospatial_lat_min double 68.00918
attribute NC_GLOBAL geospatial_lat_resolution double 0.05377607142857142
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -128.6599
attribute NC_GLOBAL geospatial_lon_min double -174.0982
attribute NC_GLOBAL geospatial_lon_resolution double 0.1652301818181818
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL history String Data measured from 2018-11-30T23:30:00Z to 2018-12-01T23:30:00Z. netCDF file created at 2023-11-18T08:07:14Z by the European HFR Node.
attribute NC_GLOBAL id String GL_TV_HF_HFR-US-Alaska-Total
attribute NC_GLOBAL infoUrl String ???
attribute NC_GLOBAL institution String UAF; ONC; CORDC - Coastal Observing Research and Development Center
attribute NC_GLOBAL institution_edmo_code String 3643 3716 3790
attribute NC_GLOBAL institution_reference String https://www.uaf.edu/uaf/; https://www.oceannetworks.ca/; https://cordc.ucsd.edu/ (external link)
attribute NC_GLOBAL institution_references String https://cordc.ucsd.edu/ https://www.uaf.edu/uaf/ https://www.oceannetworks.ca/ (external link)
attribute NC_GLOBAL keywords String 6km, alaskan, center, circulation, coastal, component, cordc, CSPD_QC, current, currents, data, DDNS_QC, density, DEPTH, development, deviation, dilution, earth, Earth Science > Oceans > Ocean Circulation > Ocean Currents, east, eastward, eastward_sea_water_velocity, EWCS, EWCT, flags, frequency, gdop, GDOP_QC, geometrical, HF, hf radar, hfradar, high, LATITUDE, LONGITUDE, near, near real time, near-real, north, northward, northward_sea_water_velocity, nrt, NSCS, NSCT, observing, ocean, ocean currents, oceans, onc, overall, position, POSITION_QC, precision, QCflag, quality, radar, real, research, resolution, science, scr-hf, sea, seawater, slope, south, south-north, standard, surface, surface water, threshold, time, uaf, variance, VART_QC, velocity, water, west, west-east
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL last_calibration_date String PBRW: N/A; SIMP: N/A; VDIG: N/A; VRID: N/A; WAIN: N/A
attribute NC_GLOBAL license String HF radar sea surface current velocity dataset by CORDC 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/.
attribute NC_GLOBAL manufacturer String PBRW: Codar, SIMP: Codar, VDIG: Codar, VRID: Codar, WAIN: Codar
attribute NC_GLOBAL naming_authority String Copernicus Marine In Situ
attribute NC_GLOBAL netcdf_version String netCDF-4 classic model
attribute NC_GLOBAL network String HFR_US_Alaska
attribute NC_GLOBAL Northernmost_Northing double 74.0321
attribute NC_GLOBAL platform_code String HFR-US-Alaska-Total
attribute NC_GLOBAL platform_name String HFR-US-Alaska-Total
attribute NC_GLOBAL processing_level String 3B
attribute NC_GLOBAL project String Integrated Ocean Observing System (IOOS)
attribute NC_GLOBAL publisher_email String cmems-service at ifremer.fr
attribute NC_GLOBAL publisher_institution String European HFR Node
attribute NC_GLOBAL publisher_name String Copernicus Marine Service
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL publisher_url String https://marine.copernicus.eu/ http://www.marineinsitu.eu/ (external link)
attribute NC_GLOBAL references String http://marine.copernicus.eu http://www.marineinsitu.eu http://www.marineinsitu.eu/wp-content/uploads/2018/02/HFR_Data_Model_Reference_Card_v1.pdf (external link)
attribute NC_GLOBAL sensor_model String PBRW: Codar, SIMP: Codar, VDIG: Codar, VRID: Codar, WAIN: Codar
attribute NC_GLOBAL site_code String HFR-US-Alaska
attribute NC_GLOBAL source String coastal structure
attribute NC_GLOBAL source_platform_category_code String 17
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 68.00918
attribute NC_GLOBAL spatial_resolution String 6.0
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String 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 Alaskan North Slope to produce near real-time surface current maps.
attribute NC_GLOBAL testOutOfDate String now-16days
attribute NC_GLOBAL time_coverage_duration String P1DT0H0M0S
attribute NC_GLOBAL time_coverage_end String 2023-01-17T13:00:00Z
attribute NC_GLOBAL time_coverage_resolution String PT1H
attribute NC_GLOBAL time_coverage_start String 2018-12-01T00:00:00Z
attribute NC_GLOBAL title String Global Ocean - In Situ Observation Copernicus
attribute NC_GLOBAL update_interval String void
attribute NC_GLOBAL Westernmost_Easting double -174.0982
dimension time double nValues=8888, evenlySpaced=false, averageSpacing=4h 4m 26s
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.5436224E9, 1.6739604E9
attribute time ancillary_variables String TIME_QC
attribute time axis String T
attribute time calendar String standard
attribute time cell_methods String TIME: mean
attribute time ioos_category String Time
attribute time long_name String Time
attribute time sdn_P02_urn String SDN:P02::AYMD
attribute time sdn_parameter_name String Elapsed time (since 1950-01-01T00:00:00Z)
attribute time sdn_parameter_urn String SDN:P01::ELTJLD01
attribute time sdn_uom_name String Days
attribute time sdn_uom_urn String SDN:P06::UTAA
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
attribute time valid_max double 90000.0
attribute time valid_min double -90000.0
dimension depth short nValues=1, onlyValue=0.0
attribute depth _CoordinateAxisType String Height
attribute depth _CoordinateZisPositive String down
attribute depth actual_range short 0, 0
attribute depth axis String Z
attribute depth ioos_category String Location
attribute depth long_name String Depth
attribute depth positive String down
attribute depth standard_name String depth
attribute depth units String m
dimension latitude float nValues=113, evenlySpaced=true, averageSpacing=0.05377607142857142
attribute latitude _ChunkSizes int 113
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range float 68.00918, 74.0321
attribute latitude ancillary_variables String POSITION_QC
attribute latitude axis String Y
attribute latitude grid_mapping String crs
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude sdn_P02_urn String SDN:P02::ALAT
attribute latitude sdn_parameter_name String Latitude north
attribute latitude sdn_parameter_urn String SDN:P01::ALATZZ01
attribute latitude sdn_uom_name String Degrees north
attribute latitude sdn_uom_urn String SDN:P06::DEGN
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
attribute latitude valid_max float 90.0
attribute latitude valid_min float -90.0
dimension longitude float nValues=276, evenlySpaced=true, averageSpacing=0.1652301818181818
attribute longitude _ChunkSizes int 276
attribute longitude _CoordinateAxisType String Lon
attribute longitude actual_range float -174.0982, -128.6599
attribute longitude ancillary_variables String POSITION_QC
attribute longitude axis String X
attribute longitude grid_mapping String crs
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude sdn_P02_urn String SDN:P02::ALAT
attribute longitude sdn_parameter_name String Longitude east
attribute longitude sdn_parameter_urn String SDN:P01::ALONZZ01
attribute longitude sdn_uom_name String Degrees east
attribute longitude sdn_uom_urn String SDN:P06::DEGE
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
attribute longitude valid_max float 180.0
attribute longitude valid_min float -180.0
variable EWCT double time, depth, latitude, longitude
attribute EWCT _FillValue double -32.767
attribute EWCT ancillary_variables String QCflag VART_QC CSPD_QC DDNS_QC GDOP_QC
attribute EWCT cell_methods String TIME: mean
attribute EWCT colorBarMaximum double 0.5
attribute EWCT colorBarMinimum double -0.5
attribute EWCT data_mode String R
attribute EWCT long_name String West-east current component
attribute EWCT sdn_P02_urn String SDN:P02::RFVL
attribute EWCT sdn_parameter_name String Eastward current velocity in the water body
attribute EWCT sdn_parameter_urn String SDN:P01::LCEWZZ01
attribute EWCT sdn_uom_name String Metres per second
attribute EWCT sdn_uom_urn String SDN:P06::UVAA
attribute EWCT standard_name String eastward_sea_water_velocity
attribute EWCT units String m s-1
attribute EWCT valid_max double 10.0
attribute EWCT valid_min double -10.0
variable NSCT double time, depth, latitude, longitude
attribute NSCT _FillValue double -32.767
attribute NSCT ancillary_variables String QCflag VART_QC CSPD_QC DDNS_QC GDOP_QC
attribute NSCT cell_methods String TIME: mean
attribute NSCT colorBarMaximum double 0.5
attribute NSCT colorBarMinimum double -0.5
attribute NSCT data_mode String R
attribute NSCT long_name String South-north current component
attribute NSCT sdn_P02_urn String SDN:P02::RFVL
attribute NSCT sdn_parameter_name String Northward current velocity in the water body
attribute NSCT sdn_parameter_urn String SDN:P01::LCNSZZ01
attribute NSCT sdn_uom_name String Metres per second
attribute NSCT sdn_uom_urn String SDN:P06::UVAA
attribute NSCT standard_name String northward_sea_water_velocity
attribute NSCT units String m s-1
attribute NSCT valid_max double 10.0
attribute NSCT valid_min double -10.0
variable EWCS double time, depth, latitude, longitude
attribute EWCS _FillValue double -32.767
attribute EWCS ancillary_variables String QCflag VART_QC
attribute EWCS cell_methods String TIME: mean
attribute EWCS colorBarMaximum double 0.1
attribute EWCS colorBarMinimum double 0.0
attribute EWCS data_mode String R
attribute EWCS long_name String Standard deviation of surface eastward sea water velocity
attribute EWCS sdn_P02_urn String SDN:P02::RFVL
attribute EWCS sdn_parameter_name String Eastward current velocity standard deviation in the water body
attribute EWCS sdn_parameter_urn String SDN:P01::SDEWZZZZ
attribute EWCS sdn_uom_name String Metres per second
attribute EWCS sdn_uom_urn String SDN:P06::UVAA
attribute EWCS units String m s-1
attribute EWCS valid_max double 10.0
attribute EWCS valid_min double -10.0
variable NSCS double time, depth, latitude, longitude
attribute NSCS _FillValue double -32.767
attribute NSCS ancillary_variables String QCflag VART_QC
attribute NSCS cell_methods String TIME: mean
attribute NSCS colorBarMaximum double 0.1
attribute NSCS colorBarMinimum double 0.0
attribute NSCS data_mode String R
attribute NSCS long_name String Standard deviation of surface northward sea water velocity
attribute NSCS sdn_P02_urn String SDN:P02::RFVL
attribute NSCS sdn_parameter_name String Northward current velocity standard deviation in the water body
attribute NSCS sdn_parameter_urn String SDN:P01::SDNSZZZZ
attribute NSCS sdn_uom_name String Metres per second
attribute NSCS sdn_uom_urn String SDN:P06::UVAA
attribute NSCS units String m s-1
attribute NSCS valid_max double 10.0
attribute NSCS valid_min double -10.0
variable GDOP double time, depth, latitude, longitude
attribute GDOP _FillValue double -32.767
attribute GDOP ancillary_variables String QCflag GDOP_QC
attribute GDOP cell_methods String TIME: mean
attribute GDOP colorBarMaximum double 0.1
attribute GDOP colorBarMinimum double 0.0
attribute GDOP comment String 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.
attribute GDOP data_mode String R
attribute GDOP long_name String Geometrical dilution of precision
attribute GDOP sdn_parameter_name String Dilution of precision 
attribute GDOP sdn_parameter_urn String SDN:S06::S0600236
attribute GDOP sdn_uom_name String Dimensionless
attribute GDOP sdn_uom_urn String SDN:P06::UUUU
attribute GDOP units String 1
attribute GDOP valid_max double 20.0
attribute GDOP valid_min double -20.0
variable POSITION_QC byte time, depth, latitude, longitude
attribute POSITION_QC _FillValue byte -127
attribute POSITION_QC cell_methods String TIME: mean
attribute POSITION_QC colorBarMaximum double 10.0
attribute POSITION_QC colorBarMinimum double 0.0
attribute POSITION_QC comment String OceanSITES quality flagging for position coordinates
attribute POSITION_QC flag_meanings String 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
attribute POSITION_QC flag_values byte 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
attribute POSITION_QC long_name String Position quality flag
attribute POSITION_QC units String 1
attribute POSITION_QC valid_max byte 9
attribute POSITION_QC valid_min byte 0
variable QCflag byte time, depth, latitude, longitude
attribute QCflag _FillValue byte -127
attribute QCflag cell_methods String TIME: mean
attribute QCflag colorBarMaximum double 10.0
attribute QCflag colorBarMinimum double 0.0
attribute QCflag comment String OceanSITES quality flagging for all QC tests  Overall QC Flag - Test applies to each vector. Test checks if all QC tests are passed.
attribute QCflag flag_meanings String 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
attribute QCflag flag_values byte 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
attribute QCflag long_name String Overall quality flag
attribute QCflag units String 1
attribute QCflag valid_max byte 9
attribute QCflag valid_min byte 0
variable VART_QC byte time, depth, latitude, longitude
attribute VART_QC _FillValue byte -127
attribute VART_QC cell_methods String TIME: mean
attribute VART_QC colorBarMaximum double 10.0
attribute VART_QC colorBarMinimum double 0.0
attribute VART_QC comment String OceanSITES quality flagging for variance threshold QC test. Threshold set to 1 m2/s2.
attribute VART_QC flag_meanings String 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
attribute VART_QC flag_values byte 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
attribute VART_QC long_name String Variance threshold quality flag
attribute VART_QC units String 1
attribute VART_QC valid_max byte 9
attribute VART_QC valid_min byte 0
variable GDOP_QC byte time, depth, latitude, longitude
attribute GDOP_QC _FillValue byte -127
attribute GDOP_QC cell_methods String TIME: mean
attribute GDOP_QC colorBarMaximum double 10.0
attribute GDOP_QC colorBarMinimum double 0.0
attribute GDOP_QC comment String OceanSITES quality flagging for GDOP threshold QC test.  GDOP Threshold QC Test - Test applies to each vector. Threshold=[GDOP threshold=2.0]
attribute GDOP_QC flag_meanings String 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
attribute GDOP_QC flag_values byte 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
attribute GDOP_QC long_name String GDOP threshold quality flag
attribute GDOP_QC units String 1
attribute GDOP_QC valid_max byte 9
attribute GDOP_QC valid_min byte 0
variable DDNS_QC byte time, depth, latitude, longitude
attribute DDNS_QC _FillValue byte -127
attribute DDNS_QC cell_methods String TIME: mean
attribute DDNS_QC colorBarMaximum double 10.0
attribute DDNS_QC colorBarMinimum double 0.0
attribute DDNS_QC comment String OceanSITES quality flagging for Data density threshold QC test.  Data Density Threshold QC Test - Test applies to each vector. Threshold=[minimum number of contributing radial velocities=3]
attribute DDNS_QC flag_meanings String 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
attribute DDNS_QC flag_values byte 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
attribute DDNS_QC long_name String Data density threshold quality flag
attribute DDNS_QC units String 1
attribute DDNS_QC valid_max byte 9
attribute DDNS_QC valid_min byte 0
variable CSPD_QC byte time, depth, latitude, longitude
attribute CSPD_QC _FillValue byte -127
attribute CSPD_QC cell_methods String TIME: mean
attribute CSPD_QC colorBarMaximum double 10.0
attribute CSPD_QC colorBarMinimum double 0.0
attribute CSPD_QC comment String OceanSITES quality flagging for Velocity threshold QC test.  Velocity Threshold QC Test - Test applies to each vector. Threshold=[maximum velocity=5.0 (m/s)]
attribute CSPD_QC flag_meanings String 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
attribute CSPD_QC flag_values byte 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
attribute CSPD_QC long_name String Velocity threshold quality flag
attribute CSPD_QC units String 1
attribute CSPD_QC valid_max byte 9
attribute CSPD_QC valid_min byte 0

 
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