Data Access Form

Dataset Title:	Currents, HF Radar, Monterey, Near-Real Time, Hourly, 6.0 km
Institution:	Scripps (Dataset ID: erdMRYhfrnet6km)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	14789	1h 58m 4s (uneven)

latitude (degrees_north)	145	0.05394 (even)

longitude (degrees_east)	177	0.06246534 (even)

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

u (Surface Eastward Sea Water Velocity, m s-1)

v (Surface Northward Sea Water Velocity, m s-1)

File type: (more info)

(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 1.4108256e+9, 1.5155856e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "Time";
    Float64 missing_value NaN;
    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 30.25, 38.01736;
    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 -127.9863, -116.9924;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  u {
    String ancillary_variables "DOPx";
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordinates "time_run time lat lon ";
    String ioos_category "Currents";
    String long_name "Surface Eastward Sea Water Velocity";
    String standard_name "surface_eastward_sea_water_velocity";
    String units "m s-1";
  }
  v {
    String ancillary_variables "DOPy";
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordinates "time_run time lat lon ";
    String ioos_category "Currents";
    String long_name "Surface Northward Sea Water Velocity";
    String standard_name "surface_northward_sea_water_velocity";
    String units "m s-1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String creator_email "motero@ucsd.edu";
    String creator_name "Mark Otero";
    String creator_url "https://cordc.ucsd.edu/projects/mapping/";
    Float64 Easternmost_Easting -116.9924;
    String format_version "HFRNet_1.0.0";
    Float64 geospatial_lat_max 38.01736;
    Float64 geospatial_lat_min 30.25;
    Float64 geospatial_lat_resolution 0.053939999999999974;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -116.9924;
    Float64 geospatial_lon_min -127.9863;
    Float64 geospatial_lon_resolution 0.06246534090909089;
    String geospatial_lon_units "degrees_east";
    String grid_projection "equidistant cylindrical";
    String grid_resolution "6km";
    String History 
"Translated to CF-1.0 Conventions by Netcdf-Java CDM (NetcdfCFWriter)
Original Dataset = fmrc:HFRADAR,_US_West_Coast,_6km_Resolution,_Hourly_RTV; Translation Date = Wed Jan 10 14:00:09 GMT 2018";
    String history 
"05-Jan-2018 22:35:21: NetCDF file created
05-Jan-2018 22:35:21: Filtered U and V by GDOP < 1.25 ;
FMRC Best Dataset
2025-04-26T11:03:10Z (local files)
2025-04-26T11:03:10Z https://odss.mbari.org/erddap/griddap/erdMRYhfrnet6km.das";
    String infoUrl "https://cordc.ucsd.edu/projects/mapping/";
    String institution "Scripps";
    String keywords "circulation, currents, Earth Science > Oceans > Ocean Circulation > Ocean Currents, eastward, near, near real time, northward, ocean, oceans, real, scripps, sea, seawater, surface, surface_eastward_sea_water_velocity, surface_northward_sea_water_velocity, time, velocity, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, 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 location "Proto fmrc:HFRADAR,_US_West_Coast,_6km_Resolution,_Hourly_RTV";
    String Metadata_Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String netcdf_library_version "4.1.3";
    Float64 Northernmost_Northing 38.01736;
    String original_institution "Scripps Institution of Oceanography";
    String product_version "HFRNet_1.1.05";
    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 regional_description "Unites States, West Coast";
    String source "Surface Ocean HF-Radar";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 30.25;
    String standard_name_vocabulary "CF-12";
    String summary 
"Surface ocean velocities estimated from HF-Radar are
representative of the upper 0.3 - 2.5 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 6 km resolution grid of the U.S.
West Coast to produce near real-time surface current
maps.";
    String time_coverage_end "2018-01-10T12:00:00Z";
    String time_coverage_start "2014-09-16T00:00:00Z";
    String title "Currents, HF Radar, Monterey, Near-Real Time, Hourly, 6.0 km";
    Float64 Westernmost_Easting -127.9863;
  }
}

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.

(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/jplMURSST.htmlTable?analysed_sst[(2015-06-09T09:00:00Z)][(-89.9945):1000:(89.9945)][(-179.995):1000:(179.995)]
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.