Data Access Form

Dataset Title:	METOP-B ASCAT daily products (ASCAT WINDS METOP B AOML), 0.25°, 2020-present
Institution:	NOAA (Dataset ID: noaa_aoml_8c7c_16cc_8cde)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (Reference Time, UTC)	1554	1 day 6h 35m 56s (uneven)

latitude (degrees_north)	720	0.25 (even)

longitude (degrees_east)	1440	0.25 (even)

File type: (more information)

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(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 1.57788e+9, 1.748952e+9;
    String axis "T";
    String calendar "Gregorian";
    String CoordinateAxisType "Time";
    String ioos_category "Time";
    String long_name "Reference 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 -89.875, 89.875;
    String axis "Y";
    String CoordinateAxisType "Lat";
    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 CoordinateAxisType "Lon";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  uwnd_Ascending {
    Float32 _FillValue NaN;
    Float32 actual_range -17.54, 26.23;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String coordsys "geographic";
    String ioos_category "Wind";
    String long_name "Zonal Wind";
    String standard_name "eastward_wind";
    String units "m s-1";
    String variable_info "10-meter Zonal Wind, Ascending Passes";
  }
  vwnd_Ascending {
    Float32 _FillValue NaN;
    Float32 actual_range -24.03, 19.3;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String coordsys "geographic";
    String ioos_category "Wind";
    String long_name "Meridional Wind";
    String standard_name "northward_wind";
    String units "m s-1";
    String variable_info "10-meter Meridional Wind, Ascending Passes";
  }
  WSPD_Ascending {
    Float32 _FillValue NaN;
    Float32 actual_range 0.2, 26.4;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Wind";
    String long_name "Surface Wind Speed, Ascending Passes";
    String standard_name "wind_speed";
    String units "m s-1";
    String variable_info "10-meter Surface Wind Speed, Ascending Passes";
  }
  Rain_Flag_Ascending {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 0.0;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String comment "0=no rain, 1=rain";
    String coordsys "geographic";
    String ioos_category "Quality";
    String long_name "Rain Flag, Ascending Passes";
    String variable_info "Rain Flag, Ascending Passes";
  }
  Time_Ascending {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 86272.0;
    Float64 colorBarMaximum 25.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Time";
    String long_name "Decimal Hour of the Day, Ascending Passes";
    String units "hour";
    String variable_info "Hour of the Day, Ascending Passes";
  }
  uwnd_Descending {
    Float32 _FillValue NaN;
    Float32 actual_range -20.31, 25.62;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String coordsys "geographic";
    String ioos_category "Wind";
    String long_name "Zonal Wind";
    String standard_name "eastward_wind";
    String units "m s-1";
    String variable_info "10-meter Zonal Wind, Descending Passes";
  }
  vwnd_Descending {
    Float32 _FillValue NaN;
    Float32 actual_range -20.49, 20.48;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String coordsys "geographic";
    String ioos_category "Wind";
    String long_name "Meridional Wind";
    String standard_name "northward_wind";
    String units "m s-1";
    String variable_info "10-meter Meridional Wind, Descending Passes";
  }
  WSPD_Descending {
    Float32 _FillValue NaN;
    Float32 actual_range 0.2, 25.73;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Wind";
    String long_name "Surface Wind Speed, Descending Passes";
    String standard_name "wind_speed";
    String units "m s-1";
    String variable_info "10-meter Surface Wind Speed, Descending Passes";
  }
  Rain_Flag_Descending {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 0.0;
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String comment "0=no rain, 1=rain";
    String coordsys "geographic";
    String ioos_category "Quality";
    String long_name "Rain Flag, Descending Passes";
    String variable_info "Rain Flag, Descending Passes";
  }
  Time_Descending {
    Float32 _FillValue NaN;
    Float32 actual_range 2176.0, 83712.0;
    Float64 colorBarMaximum 25.0;
    Float64 colorBarMinimum 0.0;
    String coordsys "geographic";
    String ioos_category "Time";
    String long_name "Decimal Hour of the Day, Descending Passes";
    String units "hour";
    String variable_info "Hour of the Day, Descending Passes";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String contact "Joaquin.Trinanes@noaa.gov";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "Joaquin.Trinanes@noaa.gov";
    String creator_name "ATLANTIC OCEANWATCH";
    String creator_type "institution";
    String creator_url "https://cwcgom.aoml.noaa.gov";
    Float64 Easternmost_Easting 179.875;
    Float64 geospatial_lat_max 89.875;
    Float64 geospatial_lat_min -89.875;
    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 
"2025-06-04T01:28:11Z https://cwcgom.aoml.noaa.gov/thredds/dodsC/ASCAT/METOPB.nc
2025-06-04T01:28:11Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_aoml_8c7c_16cc_8cde.das";
    String id "ASCAT_WINDS_METOP_B_AOML";
    String infoUrl "https://cwcgom.aoml.noaa.gov/thredds/dodsC/ASCAT/METOPB.nc.html";
    String institution "NOAA";
    String keywords "advanced, aoml, ascat, ascending, atlantic, atmosphere, atmospheric, daily, data, day, decimal, descending, earth, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, eastward, eastward_wind, environmental, eumetsat, european, exploitation, flag, hour, information, laboratory, latitude, longitude, meridional, meteorological, metop, metop-b, national, nesdis, noaa, northward, northward_wind, oceanographic, organisation, passes, precipitation, products, quality, rain, Rain_Flag_Ascending, Rain_Flag_Descending, rainfall, satellite, satellites, scatterometer, science, service, speed, surface, time, Time_Ascending, Time_Descending, uwnd_Ascending, uwnd_Descending, vwnd_Ascending, vwnd_Descending, wind, wind_speed, winds, WSPD_Ascending, WSPD_Descending, zonal";
    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 89.875;
    String source_data "NOAA/NESDIS";
    String sourceUrl "https://cwcgom.aoml.noaa.gov/thredds/dodsC/ASCAT/METOPB.nc";
    Float64 Southernmost_Northing -89.875;
    String spatial_resolution "0.25 degrees";
    String standard_name_vocabulary "CF Standard Name Table v32";
    String summary "METOP-B Advanced SCATterometer (ASCAT) daily products. The ASCAT ocean surface winds are a 10 meter neutral stability wind. These products are processed by NOAA/National Environmental Satellite, Data, and Information Service (NESDIS) utilizing measurements from ASCAT aboard the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) METOP satellite. The current geophysical model function (GMF) being used is CMOD5.5, where the GMF relates the normalized radar cross-section to the ocean surface wind speed and direction. All dates and times are Coordinated Universal Time (UTC), also known as Greenwich Mean Time (GMT), Zulu Time (UT), and World Time.";
    Float64 temporal_extent 86400.0;
    String temporal_extent_unit "seconds";
    String testOutOfDate "now-1day";
    String time_coverage_end "2025-06-03T12:00:00Z";
    String time_coverage_start "2020-01-01T12:00:00Z";
    String title "METOP-B ASCAT daily products (ASCAT WINDS METOP B AOML), 0.25°, 2020-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://upwell.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://upwell.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.

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