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Dataset Title:  Merge Windspeed, Stress, Curl, Divergence, and Ekman Upwelling, Metop-C ASCAT,
0.25 degree, Global, Near Real Time, 2020-present, 1-Day Composite
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Institution:  NOAA/NESDIS/CoastWatch/West Coast Node, NOAA/NMFS/SWFSC/ERD   (Dataset ID: erdQCwindproducts1day)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Data Access Form | Files
 
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Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6306704e+9, 1.681128e+9;
    String axis "T";
    String calendar "gregorian";
    String cell_methods "time: mean";
    String ioos_category "Time";
    String long_name "Centered Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 10.0, 10.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.833154, 89.833333;
    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 -179.833333, 179.832974;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  curl {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 3.0e-6;
    Float64 colorBarMinimum -3.0e-6;
    String ioos_category "Wind";
    String long_name "Curl of Wind Stress";
    Float32 missing_value -99999.0;
    String units "Pa m-1";
  }
  divergence {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float32 colorBarMaximum 3.0e-5;
    Float32 colorBarMinimum -3.0e-5;
    String ioos_category "Wind";
    String long_name "Wind Divergence";
    Float32 missing_value -99999.0;
    String standard_name "divergence_of_wind";
    String units "s-1";
  }
  ekman_current {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 0.06;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Currents";
    String long_name "Scalar (Modulus) Wind Diffusivity Current";
    Float32 missing_value -99999.0;
    String units "m s-1";
  }
  ekman_current_u {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 0.06;
    Float64 colorBarMinimum -0.06;
    String ioos_category "Currents";
    String long_name "Zonal Wind Diffusivity Current";
    Float32 missing_value -99999.0;
    String units "m s-1";
  }
  ekman_current_v {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 0.06;
    Float64 colorBarMinimum -0.06;
    String ioos_category "Currents";
    String long_name "Meridional Wind Diffusivity Current";
    Float32 missing_value -99999.0;
    String units "m s-1";
  }
  ekman_upwelling {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float32 colorBarMaximum 2.0e-5;
    Float32 colorBarMinimum -2.0e-5;
    String ioos_category "Currents";
    String long_name "Ekman Upwelling";
    Float32 missing_value -99999.0;
    String units "m s-1";
  }
  stress {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float32 colorBarMaximum 0.5;
    Float32 colorBarMinimum 0.0;
    String ioos_category "Wind";
    String long_name "Scalar (Modulus) Wind Stress";
    Float32 missing_value -99999.0;
    String units "Pa";
  }
  stress_u {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float32 colorBarMaximum 0.5;
    Float32 colorBarMinimum 0.0;
    String ioos_category "Wind";
    String long_name "Zonal Wind Stress";
    Float32 missing_value -99999.0;
    String standard_name "surface_downward_eastward_stress";
    String units "Pa";
  }
  stress_v {
    Float32 _FillValue -99999.0;
    String cell_methods "time: mean";
    Float32 colorBarMaximum 0.5;
    Float32 colorBarMinimum 0.0;
    String ioos_category "Wind";
    String long_name "Meridional Wind Stress";
    Float32 missing_value -99999.0;
    String standard_name "surface_downward_northward_stress";
    String units "Pa";
  }
  wind_direction {
    Float64 _FillValue 65535.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 360.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Wind";
    String long_name "Wind Direction";
    Float64 missing_value -1.0;
    String standard_name "wind_from_direction";
    String units "degrees";
  }
  wind_speed {
    Float64 _FillValue -9999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Wind";
    String long_name "Scalar (Modulus) Wind Speed";
    Float64 missing_value -9999.0;
    String standard_name "wind_speed";
    String units "m s-1";
  }
  wind_u {
    Float64 _FillValue -9999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "Zonal Wind";
    Float64 missing_value -9999.0;
    String standard_name "eastward_wind";
    String units "m s-1";
  }
  wind_v {
    Float64 _FillValue -9999.0;
    String cell_methods "time: mean";
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String ioos_category "Wind";
    String long_name "Meridional Wind";
    Float64 missing_value -9999.0;
    String standard_name "northward_wind";
    String units "m s-1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String contact "erd.data@noaa.gov";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "erd.data@noaa.gov";
    String creator_name "NOAA/NESDIS/CoastWatch/West Coast Node, NOAA/NMFS/SWFSC/ERD";
    String creator_type "institution";
    String creator_url "https://www.pfeg.noaa.gov";
    String defaultGraphQuery "wind_u%5B(last)%5D%5B(10.0)%5D%5B(89.833333):(-89.833154)%5D%5B(-179.833333):(179.832974)%5D,wind_v%5B(last)%5D%5B(10.0)%5D%5B(89.833333):(-89.833154)%5D%5B(-179.833333):(179.832974)%5D&.draw=vectors&.vars=longitude%7Clatitude%7Cwind_u%7Cwind_v&.color=0x000000&.bgColor=0xffccccff";
    Float64 Easternmost_Easting 179.832974;
    Float64 geospatial_lat_max 89.833333;
    Float64 geospatial_lat_min -89.833154;
    Float64 geospatial_lat_resolution 0.333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.832974;
    Float64 geospatial_lon_min -179.833333;
    Float64 geospatial_lon_resolution 0.333333;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 10.0;
    Float64 geospatial_vertical_min 10.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"Four-hour L3 wind data were obtained from NOAA NESDIS CoastWatch at https://coastwatch.noaa.gov/cwn/products/vector-winds-ascat-metop-abc.html and used to calculate wind stress, curl, Ekman upwelling, Wind Diffusivity Currents, and wind divergence derived variables. The four hour products were composited into daily, 3-day, 7-day, and monthly products using the NCO NCRA tool.
2023-06-01T06:31:25Z (local files)
2023-06-01T06:31:25Z http://coastwatch.pfeg.noaa.gov/griddap/erdQCwindproducts1day.das";
    String id "erdQCwindproducts3day";
    String infoUrl "https://coastwatch.noaa.gov/cwn/products/vector-winds-ascat-metop-abc.html";
    String institution "NOAA/NESDIS/CoastWatch/West Coast Node, NOAA/NMFS/SWFSC/ERD";
    String keywords "2021-present, 3-day, advanced, altitude, ascat, atmosphere, atmospheric, center, circulation, coast, coastwatch, composite, convergence, curl, current, currents, data, day, degree, degrees, diffusivity, direction, divergence, divergence_of_wind, downward, driven, earth, Earth Science > Atmosphere > Atmospheric Winds > Convergence/Divergence, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, Earth Science > Atmosphere > Atmospheric Winds > Wind Stress, Earth Science > Oceans > Ocean Circulation > Wind-Driven Circulation, eastward, eastward_wind, ekman, ekman_current, ekman_current_u, ekman_current_v, ekman_upwelling, environmental, erd, eumetsat, european, exploitation, fisheries, global, information, latitude, longitude, marine, merge, meridional, meteorological, metop, metop-c, modulus, national, near, near real time, nesdis, nmfs, noaa, node, northward, northward_wind, nrt, ocean, oceans, organisation, present, real, satellite, satellites, scalar, scatterometer, science, service, southwest, speed, stress, stress_u, stress_v, surface, surface_downward_eastward_stress, surface_downward_northward_stress, swfsc, time, upwelling, wcn, west, wind, wind-driven, wind_direction, wind_from_direction, wind_speed, wind_u, wind_v, winds, windspeed, 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.";
    String naming_authority "griddap/erddap/gov.noaa.pfeg.coastwatch";
    String NCO "netCDF Operators version 5.0.6 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Float64 Northernmost_Northing 89.833333;
    String platform "MetOp-C";
    String processing_level "L4";
    String project "CoastWatch (https://coastwatch.noaa.gov/)";
    String publisher_email "erd.data@noaa.gov";
    String publisher_name "NOAA NMFS SWFSC ERD";
    String publisher_type "institution";
    String publisher_url "https://www.pfeg.noaa.gov";
    String references "https://coastwatch.noaa.gov/cwn/products/vector-winds-ascat-metop-abc.html";
    String sensor "ASCAT";
    String source "metop-2_ASCAT_windspeed";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.833154;
    String spatial_resolution "35km";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String sumary "Wind data originating with wind velocity measurements from the ASCAT instrument onboard EUMETSAT's Metop-C satellite. ASCAT is a microwave scatterometer designed to measure surface wind velocity and direction over the global ocean. Wind velocity is used to generate the following derived products: wind stress, curl, divergence, wind-driven (Ekman) currents and Ekman Upwelling";
    String summary "Merge Windspeed, Stress, Curl, Divergence, and Ekman Upwelling, Metop-C Advanced SCATterometer (ASCAT), 0.25 degree, Global, Near Real Time, 2021-present, 3-Day Composite";
    String time_coverage_duration "P1D";
    String time_coverage_end "2023-04-10T12:00:00Z";
    String time_coverage_resolution "P1D";
    String time_coverage_start "2021-09-03T12:00:00Z";
    String title "Merge Windspeed, Stress, Curl, Divergence, and Ekman Upwelling, Metop-C ASCAT, 0.25 degree, Global, Near Real Time, 2020-present, 1-Day Composite";
    Float64 Westernmost_Easting -179.833333;
  }
}

 

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.

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.


 
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