Data Access Form

Dataset Title:	Ocean Surface Winds, ASCAT - Daily, 2007-present
Institution:	HAWAII SOEST (Dataset ID: ascat_daily_apdrc)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	6130	1 day (even)

latitude (degrees_north)	641	0.25 (even)

longitude (degrees_east)	1440	0.25 (even)

File type: (more information)

(Documentation / Bypass this form)

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.1744352e+9, 1.7039808e+9;
    String axis "T";
    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";
    Float64 actual_range -79.875, 80.125;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -179.875, 179.875;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  wsp {
    Float32 _FillValue 1.0e+33;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Wind";
    String long_name "wind speed";
    Float32 missing_value 1.0e+33;
    String standard_name "wind_speed";
    String units "m s-1";
  }
  uwnd {
    Float32 _FillValue 1.0e+33;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "eastward wind speed";
    Float32 missing_value 1.0e+33;
    String standard_name "eastward_wind";
    String units "m s-1";
  }
  vwnd {
    Float32 _FillValue 1.0e+33;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "northward wind speed";
    Float32 missing_value 1.0e+33;
    String standard_name "northward_wind";
    String units "m s-1";
  }
  wind_stress {
    Float32 _FillValue 1.0e+33;
    String ioos_category "Wind";
    String long_name "wind stress (pa)";
    Float32 missing_value 1.0e+33;
  }
  uwnd_stress {
    Float32 _FillValue 1.0e+33;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "eastward wind stress (pa)";
    Float32 missing_value 1.0e+33;
    String standard_name "eastward_wind";
  }
  vwnd_stress {
    Float32 _FillValue 1.0e+33;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "northward wind stress (pa)";
    Float32 missing_value 1.0e+33;
    String standard_name "northward_wind";
  }
  wsp_err {
    Float32 _FillValue 1.0e+33;
    String ioos_category "Wind";
    String long_name "wind speed root mean square";
    Float32 missing_value 1.0e+33;
    String units "m s-1";
  }
  uwnd_err {
    Float32 _FillValue 1.0e+33;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "eastward wind speed root mean square";
    Float32 missing_value 1.0e+33;
    String standard_name "eastward_wind";
    String units "m s-1";
  }
  vwnd_err {
    Float32 _FillValue 1.0e+33;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "northward wind speed root mean square";
    Float32 missing_value 1.0e+33;
    String standard_name "northward_wind";
    String units "m s-1";
  }
  sampling_length {
    Float32 _FillValue 1.0e+33;
    String ioos_category "Unknown";
    String long_name "sampling length";
    Float32 missing_value 1.0e+33;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "HAWAII SOEST";
    String creator_type "institution";
    String creator_url "http://apdrc.soest.hawaii.edu/datadoc/ascat.php";
    String dataType "Grid";
    String documentation "http://apdrc.soest.hawaii.edu/datadoc/ascat.php";
    Float64 Easternmost_Easting 179.875;
    Float64 geospatial_lat_max 80.125;
    Float64 geospatial_lat_min -79.875;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.875;
    Float64 geospatial_lon_min -179.875;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    String history 
"Mon Apr 01 16:38:33 HST 2024 : imported by GrADS Data Server 2.0
2024-04-25T03:33:34Z http://apdrc.soest.hawaii.edu/dods/public_data/satellite_product/ASCAT/daily
2024-04-25T03:33:34Z https://oceanwatch.pifsc.noaa.gov/erddap/griddap/ascat_daily_apdrc.das";
    String infoUrl "http://apdrc.soest.hawaii.edu/datadoc/ascat.php";
    String institution "HAWAII SOEST";
    String keywords "advanced, ascat, atmosphere, atmospheric, daily, data, day, earth, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, eastward, eastward_wind, field, global, hawaii, latitude, length, longitude, mean, northward, northward_wind, ocean, root, sampling, sampling_length, scatterometer, school, science, soest, speed, square, stress, surface, technology, time, uwnd, uwnd_err, uwnd_stress, vwnd, vwnd_err, vwnd_stress, wind, wind_speed, wind_stress, winds, wsp, wsp_err";
    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.";
    Float64 Northernmost_Northing 80.125;
    String sourceUrl "http://apdrc.soest.hawaii.edu/dods/public_data/satellite_product/ASCAT/daily";
    Float64 Southernmost_Northing -79.875;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "Daily Advanced SCATterometer (ASCAT) global wind field. HAWAII School of Ocean and Earth Science and Technology (SOEST) data from http://apdrc.soest.hawaii.edu/dods/public_data/satellite_product/ASCAT/daily.das . 0.25Âº resolution. More info: http://apdrc.soest.hawaii.edu/datadoc/ascat.php";
    String time_coverage_end "2023-12-31T00:00:00Z";
    String time_coverage_start "2007-03-21T00:00:00Z";
    String title "Ocean Surface Winds, ASCAT - Daily, 2007-present";
    Float64 Westernmost_Easting -179.875;
  }
}

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/jplMURSST41.htmlTable?analysed_sst[(2015-06-09T09:00:00Z)][(-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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