Easier access to scientific data
|
ERDDAP
Easier access to scientific data |
| Dataset Title: | Near-Real Time Surface Ocean Velocity, Hawaiian Islands, 1km Resolution
|
| Institution: | Pacific Islands Ocean Observing System (PacIOOS) (Dataset ID: hfradar_ushi_1km) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Make a graph
|
Attributes {
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.7504388e+9, 1.7688024e+9;
String axis "T";
String calendar "gregorian";
String ioos_category "Time";
String long_name "Time";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
latitude {
String _CoordinateAxisType "Lat";
Float32 actual_range 16.2204, 24.91688;
String axis "Y";
String ioos_category "Location";
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float32 actual_range -163.1444, -151.9565;
String axis "X";
String ioos_category "Location";
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
}
u {
Int32 _ChunkSizes 1, 54, 1204;
String ancillary_variables "dopx";
String cell_methods "depth: mean time: mean";
Float64 colorBarMaximum 0.15;
Float64 colorBarMinimum -0.15;
String coordinates "time depth lat lon";
String grid_mapping "wgs84";
String ioos_category "Currents";
String long_name "eastward sea surface velocity";
String standard_name "surface_eastward_sea_water_velocity";
String units "m s-1";
}
v {
Int32 _ChunkSizes 1, 54, 1204;
String ancillary_variables "dopy";
String cell_methods "depth: mean time: mean";
Float64 colorBarMaximum 0.15;
Float64 colorBarMinimum -0.15;
String coordinates "time depth lat lon";
String grid_mapping "wgs84";
String ioos_category "Currents";
String long_name "northward sea surface velocity";
String standard_name "surface_northward_sea_water_velocity";
String units "m s-1";
}
dopy {
Int32 _ChunkSizes 1, 54, 1204;
Float64 colorBarMaximum 1.25;
Float64 colorBarMinimum 0.0;
String comment "The latitudinal dilution of precision (dopy) represents the contribution of radial geometry to uncertainty in the northward velocity estimate (v).";
String coordinates "time depth lat lon";
String grid_mapping "wgs84";
String ioos_category "Quality";
String long_name "latitudinal dilution of precision";
}
dopx {
Int32 _ChunkSizes 1, 54, 1204;
Float64 colorBarMaximum 1.25;
Float64 colorBarMinimum 0.0;
String comment "The longitudinal dilution of precision (dopx) represents the contribution of radial geometry to uncertainty in the eastward velocity estimate (u).";
String coordinates "time depth lat lon";
String grid_mapping "wgs84";
String ioos_category "Quality";
String long_name "longitudinal dilution of precision";
}
hdop {
Int32 _ChunkSizes 1, 54, 1204;
String ancillary_variables "dopx dopy";
Float64 colorBarMaximum 1.25;
Float64 colorBarMinimum 0.0;
String comment "The horizontal dilution of precision (hdop) is the vector length (magnitude) of the eastward (dopx) and northward (dopy) dilution of precision. It represents the contribution of radial geometry to the overall uncertainty in the total velocity (u and v) estimate.";
String coordinates "time depth lat lon";
String grid_mapping "wgs84";
String ioos_category "Quality";
String long_name "horizontal dilution of precision";
}
number_of_sites {
Int32 _ChunkSizes 1, 217, 1204;
Byte _FillValue -127;
String _Unsigned "false";
Float64 colorBarMaximum 5.0;
Float64 colorBarMinimum 2.0;
String comment "Number of radars contributing radials to the total solution";
String coordinates "time depth lat lon";
String grid_mapping "wgs84";
String ioos_category "Quality";
String long_name "number of contributing radars";
String units "count";
}
number_of_radials {
Int32 _ChunkSizes 1, 108, 1204;
Int16 _FillValue -32767;
Float64 colorBarMaximum 300.0;
Float64 colorBarMinimum 0.0;
String comment "Number of radials contributing to the total solution";
String coordinates "time depth lat lon";
String grid_mapping "wgs84";
String ioos_category "Quality";
String long_name "number of contributing radials";
String units "count";
}
NC_GLOBAL {
String acknowledgement "The Pacific Islands Ocean Observing System (PacIOOS) is funded through the National Oceanic and Atmospheric Administration (NOAA) as a Regional Association within the U.S. Integrated Ocean Observing System (IOOS). PacIOOS is coordinated by the University of Hawaii School of Ocean and Earth Science and Technology (SOEST).";
String cdm_data_type "Grid";
String comment "Radial HFR data collected by Pierre Flament (pflament@hawaii.edu). U/V gridded currents produced from the radial data by IOOS HFRNet and distributed at NOAA/NDBC. Currents re-distributed by PacIOOS to enable WMS access.";
String contributor2_email "webmaster.ndbc@noaa.gov";
String contributor2_institution "NOAA National Data Buoy Center (NDBC)";
String contributor2_name "NOAA National Data Buoy Center (NDBC)";
String contributor2_role "resourceProvider";
String contributor2_type "institution";
String contributor2_url "https://www.ndbc.noaa.gov";
String contributor_email "pflament@hawaii.edu";
String contributor_institution "University of Hawaii at Manoa";
String contributor_name "Pierre Flament";
String contributor_role "originator";
String contributor_type "person";
String contributor_url "https://www.oceanphysics.org/wiki/index.php?n=Staff.PierreFlament";
String Conventions "CF-1.6, ACDD-1.3";
String creator_email "data.ioos@noaa.gov";
String creator_institution "U.S. Integrated Ocean Observing System (IOOS) High Frequency Radar Network (HFRNet)";
String creator_name "U.S. Integrated Ocean Observing System (IOOS) High Frequency Radar Network (HFRNet)";
String creator_type "institution";
String creator_url "https://hfradar.ioos.us";
String date_created "2012-01-01";
String date_issued "2012-01-01";
String date_metadata_modified "2025-09-30";
String date_modified "2025-09-30";
String defaultGraphQuery "u[][(18.17304):(22.7744)][(-159.1082):(-154.5047)],v[][(18.17304):(22.7744)][(-159.1082):(-154.5047)]&.draw=vectors";
Float64 Easternmost_Easting -151.9565;
String geospatial_bounds "POLYGON ((16.22034 -163.14439, 24.91688 -163.14439, 24.91688 -151.95650, 16.22034 -151.95650, 16.22034 -163.14439))";
String geospatial_bounds_crs "EPSG:4326";
Float64 geospatial_lat_max 24.91688;
Float64 geospatial_lat_min 16.2204;
Float64 geospatial_lat_resolution 0.009039999999999998;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -151.9565;
Float64 geospatial_lon_min -163.1444;
Float64 geospatial_lon_resolution 0.009299999999999987;
String geospatial_lon_units "degrees_east";
String history
"2009-07-08T00:00:00Z UH/SOEST (P. Flament) deployed HFR array at Koko Head, Oahu (KOK): 21.2608, -157.7028.
2009-12-11T00:00:00Z UH/SOEST (P. Flament) deployed HFR array at Kakaako (Waikiki), Oahu (KAK): 21.2918, -157.8631.
2010-07-28T22:00:00Z IOOS HFRNet (CORDC/UCSD) begins generating Hawaii surface currents from radial velocities.
2010-09-08T06:45:00Z UH/SOEST (P. Flament) deployed HFR array at Kalaeloa (Barbers Point), Oahu (KAL): 21.2975, -158.0836.
2013-03-26T22:30:00Z UH/SOEST (P. Flament) deployed HFR array at Kaena Point, Oahu (KNA): 21.5749, -158.2819.
2013-12-17T06:40:00Z UH/SOEST (P. Flament) deployed HFR array at Keaukaha, Hawaii Island (KKH): 19.7320, -155.0480.
2015-05-05T07:00:00Z UH/SOEST (P. Flament) deployed HFR array at Pepeekeo, Hawaii Island (PPK): 19.8472, -155.0828.
2015-09-14T19:00:00Z UH/SOEST (P. Flament) deployed HFR array at Kapolei, Oahu (KAP): 21.3114, -158.1169.
2020-06-16T00:00:00Z Exclude invalid Kaena Point, Oahu (KNA) data prior to 2019-11-30T16:00:00Z.
2021-04-19T06:19:00Z To comply with new ITU rules and frequency allocations, changed KAK range resolution from 600 m to 750 m (250 kHz to 200 kHz) and PPK from 666 m to 750 m (224 kHz to 200 kHz). Changed KAL, KOK, and KNA frequency to 16.150 MHz with 100 kHz bandwidth (1.5 km), which does not impact their range or resolution.
2025-08-22T18:00:00Z Technical support and data distribution for the HFRNet has migrated from the Coastal Observing Research and Development Center (CORDC) of Scripps Institution of Oceanography (SIO) at the University of California San Diego (UCSD) to the U.S. Integrated Ocean Observng System (IOOS) and the NOAA National Data Buoy Center (NDBC). Dataset id changed from HFRADAR_USHI_hourly_RTV_1km to hfradar_ushi_1km. All links have been updated accordingly.
2025-09-30T22:00:00Z Data being re-distributed via PacIOOS THREDDS Data Server (TDS) to enable Web Map Service (WMS) via TDS/ncWMS, which is not functional using NOAA/NDBC TDS.
2026-01-19T09:04:25Z https://pae-paha.pacioos.hawaii.edu/thredds/dodsC/hfradar_ushi_1km
2026-01-19T09:04:25Z https://pae-paha.pacioos.hawaii.edu/erddap/griddap/hfradar_ushi_1km.das";
String id "hfradar_ushi_1km";
String infoUrl "https://ioos.noaa.gov/project/hf-radar/";
String institution "Pacific Islands Ocean Observing System (PacIOOS)";
String instrument "Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Radar Sounders > SCR-HF > Surface Current Radar";
String instrument_vocabulary "GCMD Instrument Keywords";
String ISO_Topic_Categories "oceans";
String keywords "Earth Science > Oceans > Ocean Circulation > Ocean Currents, Earth Science > Spectral/Engineering > Radio Wave";
String keywords_vocabulary "GCMD Science Keywords";
String license "The data may be used and redistributed for free but is not intended for navigational or legal use, since it may contain inaccuracies. Neither the data Contributor, University of Hawaii, PacIOOS, NOAA, State of Hawaii nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.";
String locations "Continent > North America > United States Of America > Hawaii, Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Big Island, Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Hawaii Island > Hilo, Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Oahu > Honolulu, Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Oahu > Waianae";
String locations_vocabulary "GCMD Location Keywords";
String metadata_link "https://www.pacioos.hawaii.edu/metadata/hfradar_ushi_1km.html";
String naming_authority "org.pacioos";
Float64 Northernmost_Northing 24.91688;
String platform "In Situ Land-based Platforms > > Radio Transmitters";
String platform_vocabulary "GCMD Platform Keywords";
String processing_level "NOAA Level 3. Near real-time dataset with automated data acquisition and processing quality control.";
String program "Pacific Islands Ocean Observing System (PacIOOS)";
String project "Pacific Islands Ocean Observing System (PacIOOS)";
String publisher_email "info@pacioos.org";
String publisher_institution "Pacific Islands Ocean Observing System (PacIOOS)";
String publisher_name "Pacific Islands Ocean Observing System (PacIOOS)";
String publisher_type "institution";
String publisher_url "http://www.pacioos.hawaii.edu";
String references "Terrill, E. et al., 2006. Data Management and Real-time Distribution in the HF-Radar National Network. Proceedings of the MTS/IEEE Oceans 2006 Conference, Boston MA, September 2006.";
String source "high frequency radar (HFR)";
String sourceUrl "https://pae-paha.pacioos.hawaii.edu/thredds/dodsC/hfradar_ushi_1km";
Float64 Southernmost_Northing 16.2204;
String standard_name_vocabulary "CF Standard Name Table v39";
String summary "Surface ocean velocities estimated from HF-Radar (HFR) are representative of the upper 0.5 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 1km resolution grid of the Hawaiian Islands to produce near real-time surface current maps.";
String testOutOfDate "now-3hours";
String time_coverage_end "2026-01-19T06:00:00Z";
String time_coverage_resolution "PT1H";
String time_coverage_start "2025-06-20T17:00:00Z";
String title "Near-Real Time Surface Ocean Velocity, Hawaiian Islands, 1km Resolution";
Float64 Westernmost_Easting -163.1444;
}
}
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.
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.