ERDDAP > info > HFR_US_ALASKA_Total

Grid DAP Data	Sub- set	Table DAP Data	Make A Graph	W M S	Source Data Files	Acces- sible	Title	Sum- mary	FGDC, ISO, Metadata	Back- ground Info	RSS	E mail	Institution	Dataset ID
data			graph	M		public	HFR - NRT Surface Ocean Velocity, Alaskan North Slope, 6km Resolution - 2020-present		F   I   M	background			University of Ala...	HFR_US_ALASKA_Total

The Dataset's Variables and Attributes

Row Type	Variable Name	Attribute Name	Data Type	Value
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 collected and made freely available by the Copernicus project 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	contact	String	euhfrnode at azti.es
attribute	NC_GLOBAL	contributor_email	String	hfrnet.administrators@sio.ucsd.edu; hfrnet.administrators@sio.ucsd.edu; hfrnet.administrators@sio.ucsd.edu
attribute	NC_GLOBAL	contributor_name	String	Lisa Hazard; Hugh Roarty; Mark Otero
attribute	NC_GLOBAL	contributor_role	String	HFR expert; HFR expert; HFR expert
attribute	NC_GLOBAL	Conventions	String	CF-1.6 Copernicus-InSituTAC-FormatManual-1.42 Copernicus-InSituTAC-SRD-1.5 Copernicus-InSituTAC-ParametersList-3.2.1, COARDS, ACDD-1.3
attribute	NC_GLOBAL	creator_name	String	EUHFRNODE
attribute	NC_GLOBAL	data_assembly_center	String	European HFR Node
attribute	NC_GLOBAL	data_assembly_center_email	String	euhfrnode at azti.es
attribute	NC_GLOBAL	data_character_set	String	utf8
attribute	NC_GLOBAL	data_language	String	eng
attribute	NC_GLOBAL	data_model_reference	String	http://www.marineinsitu.eu/wp-content/uploads/2018/02/HFR_Data_Model_Reference_Card_v1.pdf
attribute	NC_GLOBAL	data_type	String	HF radar total data
attribute	NC_GLOBAL	distribution_statement	String	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.
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	-128.6406
attribute	NC_GLOBAL	feature_type	String	surface
attribute	NC_GLOBAL	geospatial_lat_max	double	74.04128
attribute	NC_GLOBAL	geospatial_lat_min	double	68.0
attribute	NC_GLOBAL	geospatial_lat_resolution	double	0.05394
attribute	NC_GLOBAL	geospatial_lat_units	String	degrees_north
attribute	NC_GLOBAL	geospatial_lon_max	double	-128.6406
attribute	NC_GLOBAL	geospatial_lon_min	double	-174.1174
attribute	NC_GLOBAL	geospatial_lon_resolution	double	0.14345993690851735
attribute	NC_GLOBAL	geospatial_lon_units	String	degrees_east
attribute	NC_GLOBAL	grid_mapping_epsg_code	String	EPSG:4326
attribute	NC_GLOBAL	grid_mapping_inverse_flattening	double	298.257223563
attribute	NC_GLOBAL	grid_mapping_name	String	latitude_longitude
attribute	NC_GLOBAL	grid_mapping_semi_major_axis	double	6378137.0
attribute	NC_GLOBAL	grid_resolution	String	6
attribute	NC_GLOBAL	infoUrl	String	https://www.uaf.edu/uaf/ https://www.oceannetworks.ca/ https://cordc.ucsd.edu/
attribute	NC_GLOBAL	institution	String	University of Alaska Fairbanks (UAF); Ocean Networks Canada (ONC); CORDC - Coastal Observing Research and Development Center
attribute	NC_GLOBAL	institution_edmo_code	String	3643 3716 3790
attribute	NC_GLOBAL	institution_references	String	https://www.uaf.edu/uaf/ https://www.oceannetworks.ca/ https://cordc.ucsd.edu/
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, flag, 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	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	metadata_character_set	String	utf8
attribute	NC_GLOBAL	metadata_contact	String	lorenzo.corgnati at sp.ismar.cnr.it
attribute	NC_GLOBAL	metadata_language	String	eng
attribute	NC_GLOBAL	netcdf_format	String	netcdf4_classic
attribute	NC_GLOBAL	network	String	HFR_US_Alaska
attribute	NC_GLOBAL	Northernmost_Northing	double	74.04128
attribute	NC_GLOBAL	owner	String	University of Alaska Fairbanks (UAF); Ocean Networks Canada (ONC); CORDC - Coastal Observing Research and Development Center
attribute	NC_GLOBAL	platform_code	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	qc_manual	String	Recommendation Report 2 on improved common procedures for HFR QC analysis https://dx.doi.org/10.25607/OBP-944
attribute	NC_GLOBAL	reference_system	String	EPSG:4806
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
attribute	NC_GLOBAL	sensor	String	Codar
attribute	NC_GLOBAL	site_code	String	HFR-US-Alaska
attribute	NC_GLOBAL	sourceUrl	String	https://thredds.hfrnode.eu:8443/thredds/dodsC/EUHFR_NRTcurrent_HFR-US-Alaska-Total_v2.2
attribute	NC_GLOBAL	Southernmost_Northing	double	68.0
attribute	NC_GLOBAL	standard_name_vocabulary	String	CF Standard Name Table v70
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-15days
attribute	NC_GLOBAL	time_coverage_duration	String	PT1H
attribute	NC_GLOBAL	time_coverage_end	String	2022-12-13T02:00:00Z
attribute	NC_GLOBAL	time_coverage_resolution	String	PT1H
attribute	NC_GLOBAL	time_coverage_start	String	2020-07-24T00:00:00Z
attribute	NC_GLOBAL	title	String	HFR - NRT Surface Ocean Velocity, Alaskan North Slope, 6km Resolution - 2020-present
attribute	NC_GLOBAL	vocablaries	String	SDN_P01
attribute	NC_GLOBAL	Westernmost_Easting	double	-174.1174
dimension	time		double	nValues=6254, evenlySpaced=false, averageSpacing=3h 20m 50s
attribute	time	_CoordinateAxisType	String	Time
attribute	time	actual_range	double	1.5955488E9, 1.6708968E9
attribute	time	ancillary_variables	String	TIME_QC
attribute	time	axis	String	T
attribute	time	calendar	String	standard
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
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=0.05394
attribute	latitude	_CoordinateAxisType	String	Lat
attribute	latitude	actual_range	float	68.0, 74.04128
attribute	latitude	ancillary_variables	String	POSITION_QC
attribute	latitude	axis	String	Y
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=318, evenlySpaced=true, averageSpacing=0.14345993690851735
attribute	longitude	_CoordinateAxisType	String	Lon
attribute	longitude	actual_range	float	-174.1174, -128.6406
attribute	longitude	ancillary_variables	String	POSITION_QC
attribute	longitude	axis	String	X
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	colorBarMaximum	double	0.5
attribute	EWCT	colorBarMinimum	double	-0.5
attribute	EWCT	coordsys	String	geographic
attribute	EWCT	data_mode	String	R
attribute	EWCT	ioos_category	String	Currents
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	colorBarMaximum	double	0.5
attribute	NSCT	colorBarMinimum	double	-0.5
attribute	NSCT	coordsys	String	geographic
attribute	NSCT	data_mode	String	R
attribute	NSCT	ioos_category	String	Currents
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	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	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	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_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	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	conventions	String	Copernicus Marine In Situ reference table 2
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	colorBarMaximum	double	10.0
attribute	QCflag	colorBarMinimum	double	0.0
attribute	QCflag	comment	String	OceanSITES quality flagging for all QC tests.
attribute	QCflag	conventions	String	Copernicus Marine In Situ reference table 2
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	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	conventions	String	Copernicus Marine In Situ reference table 2
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	colorBarMaximum	double	10.0
attribute	GDOP_QC	colorBarMinimum	double	0.0
attribute	GDOP_QC	comment	String	OceanSITES quality flagging for GDOP threshold QC test. Threshold set to 2.
attribute	GDOP_QC	conventions	String	Copernicus Marine In Situ reference table 2
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	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. Threshold set to 3 radials.
attribute	DDNS_QC	conventions	String	Copernicus Marine In Situ reference table 2
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	colorBarMaximum	double	10.0
attribute	CSPD_QC	colorBarMinimum	double	0.0
attribute	CSPD_QC	comment	String	OceanSITES quality flagging for Velocity threshold QC test. Threshold set to 5 m/s.
attribute	CSPD_QC	conventions	String	Copernicus Marine In Situ reference table 2
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

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.