Make A Graph

Dataset Title:	Wind Stress, METOP ASCAT, Global, Near Real Time (3 Day Composite)
Institution:	NOAA CoastWatch, West Coast Node (Dataset ID: erdQAstress3day)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Data Access Form

Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

time (UTC)

specify just 1 value →

altitude (m)

specify just 1 value →

latitude (degrees_north)

longitude (degrees_east)

Graph Settings
Color Bar: Continuity: Scale:
Min: Max: N Sections:
Draw the land mask:

(Please be patient. It may take a while to get the data.)

Optional:
Then set the File Type: and

or view the URL:
(Documentation / Bypass this form

) (File Type information)

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Click on the map to specify a new center point.

Zoom:

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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:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use Slide Sorter to build a personal web page that displays graphs of the latest data, each in its own, draggable slide.

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.2546576e+9, 1.3690512e+9;
    String axis "T";
    Int32 fraction_digits 0;
    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 0.0, 0.0;
    String axis "Z";
    Int32 fraction_digits 0;
    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 -75.0, 75.0;
    String axis "Y";
    String coordsys "geographic";
    Int32 fraction_digits 2;
    String ioos_category "Location";
    String long_name "Latitude";
    String point_spacing "even";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 0.0, 360.0;
    String axis "X";
    String coordsys "geographic";
    Int32 fraction_digits 2;
    String ioos_category "Location";
    String long_name "Longitude";
    String point_spacing "even";
    String standard_name "longitude";
    String units "degrees_east";
  }
  taux {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordsys "geographic";
    Int32 fraction_digits 2;
    String ioos_category "Wind";
    String long_name "Zonal Wind Stress";
    Float32 missing_value -9999999.0;
    String units "Pa";
  }
  tauy {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordsys "geographic";
    Int32 fraction_digits 2;
    String ioos_category "Wind";
    String long_name "Meridional Wind Stress";
    Float32 missing_value -9999999.0;
    String units "Pa";
  }
  curl {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 3.0e-6;
    Float64 colorBarMinimum -3.0e-6;
    String coordsys "geographic";
    Int32 fraction_digits 8;
    String ioos_category "Wind";
    String long_name "Curl of Wind Stress";
    Float32 missing_value -9999999.0;
    String units "Pa m-1";
  }
  modStress {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum 0.0;
    String colorBarPalette "WhiteRedBlack";
    String coordsys "geographic";
    Int32 fraction_digits 2;
    String ioos_category "Wind";
    String long_name "Modulus of Wind Stress";
    Float32 missing_value -9999999.0;
    String units "Pa";
  }
  upwelling {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 2.0e-5;
    Float64 colorBarMinimum -2.0e-5;
    String coordsys "geographic";
    Int32 fraction_digits 6;
    String ioos_category "Currents";
    String long_name "Ekman Upwelling";
    Float32 missing_value -9999999.0;
    String units "m s-1";
  }
  NC_GLOBAL {
    String acknowledgement "NOAA NESDIS COASTWATCH, NOAA SWFSC ERD";
    String cdm_data_type "Grid";
    String composite "true";
    String contributor_name "EUMETSAT and NOAA|NESDIS";
    String contributor_role "Source of level 2 data.";
    String Conventions "COARDS, CF-1.6, Unidata Dataset Discovery v1.0";
    String creator_email "dave.foley@noaa.gov";
    String creator_name "NOAA CoastWatch, West Coast Node";
    String creator_url "http://coastwatch.pfel.noaa.gov";
    String date_created "2013-05-21Z";
    String date_issued "2013-05-21Z";
    Float64 Easternmost_Easting 360.0;
    Float64 geospatial_lat_max 75.0;
    Float64 geospatial_lat_min -75.0;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 360.0;
    Float64 geospatial_lon_min 0.0;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"EUMETSAT and NOAA|NESDIS
2013-05-21T06:39:51Z NOAA CoastWatch (West Coast Node) and NOAA SFSC ERD
2013-05-22T07:24:01Z http://oceanwatch.pfeg.noaa.gov/thredds/dodsC/satellite/QA/taux/3day
2013-05-22T07:24:01Z http://coastwatch.pfeg.noaa.gov/griddap/erdQAstress3day.das";
    String infoUrl "http://coastwatch.pfeg.noaa.gov/infog/QA_taux_las.html";
    String institution "NOAA CoastWatch, West Coast Node";
    String keywords 
"Atmosphere > Atmospheric Winds > Wind Stress,
Oceans > Ocean Winds > Wind Stress,
ascat, atmosphere, atmospheric, coastwatch, composite, curl, currents, day,
downward, eastward, ekman, global, meridional, metop, modulus, near, near
real time, noaa, northward, ocean, oceans, real, stress, surface,
surface_downward_eastward_stress, surface_downward_northward_stress, time,
upwelling, wcn, wind, winds, 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 Metadata_Conventions "COARDS, CF-1.6, Unidata Dataset Discovery v1.0";
    String naming_authority "gov.noaa.pfel.coastwatch";
    Float64 Northernmost_Northing 75.0;
    String origin "EUMETSAT and NOAA|NESDIS";
    String processing_level "3";
    String project "CoastWatch (http://coastwatch.noaa.gov/)";
    String projection "geographic";
    String projection_type "mapped";
    String references "NOAA/NESDIS http://manati.orbit.nesdis.noaa.gov/products/ASCAT.php .";
    String satellite "METOP";
    String sensor "ASCAT";
    String source "satellite observation: METOP, ASCAT";
    String sourceUrl "http://oceanwatch.pfeg.noaa.gov/thredds/dodsC/satellite/QA/taux/3day";
    Float64 Southernmost_Northing -75.0;
    String standard_name_vocabulary "CF-12";
    String summary 
"NOAA CoastWatch distributes near real time wind stress data in zonal,
meridional, modulus, and wind stress curl sets.  This data begins with wind
velocity measurements from the ASCAT instrument onboard EUMETSAT's METOP
satellite.  ASCAT is a microwave scatterometer designed to measure surface
winds over the global ocean.  NOAA CoastWatch processes wind velocity to wind
stress and wind stress curl.";
    String time_coverage_end "2013-05-20T12:00:00Z";
    String time_coverage_start "2009-10-04T12:00:00Z";
    String title "Wind Stress, METOP ASCAT, Global, Near Real Time (3 Day Composite)";
    Float64 Westernmost_Easting 0.0;
  }
}

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 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.

(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
http://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.htmlTable?sst[(2007-10-21T00:00:00)][0][(-75):100:(75)][(180):100:(360)]
Thus, the query is often a variable name (e.g., sst),
followed by a set of [] for each of the variable's dimensions
(for example, [time][altitude][latitude][longitude]),
with your desired (start):stride:(stop) values within each [].

For details, see the griddap Documentation.

ERDDAP, Version 1.42
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