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ERDDAP > griddap > Make A Graph ?

Dataset Title:  Wind, Metop-A ASCAT, 0.25°, Global, Near Real Time, 2009-present (Monthly) Subscribe RSS
Institution:  NOAA NMFS SWFSC ERD   (Dataset ID: erdQAwindmday)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Data Access Form
 
Graph Type:  ?
X Axis:  ?
Y Axis:  ?
Vector X:  ?
Vector Y:  ?
 
Dimensions ?    Start ?    Stop ?
time (UTC) ?     specify just 1 value →
    << -
< <
altitude (m) ?     specify just 1 value →
   
< <
latitude (degrees_north) ?
    +
    -
< slider >
longitude (degrees_east) ?
    +
    -
< slider >
 
Graph Settings
Color: 
Vector Standard: 
Y Axis Minimum:   Maximum:   Ascending: 
 
(Please be patient. It may take a while to get the data.)
 
Optional:
Then set the File Type: (File Type information)
and
or view the URL:
(Documentation / Bypass this form ? )
    Click on the map to specify a new center point. ?
Zoom:
[The graph you specified. Please be patient.]

 

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 1.2556944e+9, 1.537056e+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 10.0, 10.0;
    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";
  }
  x_wind {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String coordsys "geographic";
    Int32 fraction_digits 1;
    String ioos_category "Wind";
    String long_name "Zonal Wind";
    Float32 missing_value -9999999.0;
    String standard_name "x_wind";
    String units "m s-1";
  }
  y_wind {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum -15.0;
    String coordsys "geographic";
    Int32 fraction_digits 1;
    String ioos_category "Wind";
    String long_name "Meridional Wind";
    Float32 missing_value -9999999.0;
    String standard_name "y_wind";
    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, ACDD-1.3";
    String creator_email "erd.data@noaa.gov";
    String creator_name "NOAA NMFS SWFSC ERD";
    String creator_type "institution";
    String creator_url "https://www.pfeg.noaa.gov";
    String date_created "2018-10-03";
    String date_issued "2018-10-03";
    String defaultGraphQuery "&.draw=vectors";
    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 10.0;
    Float64 geospatial_vertical_min 10.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"EUMETSAT and NOAA|NESDIS
2018-10-03T20:01:22Z NOAA CoastWatch (West Coast Node) and NOAA SFSC ERD
2018-10-18T14:29:58Z (local files)
2018-10-18T14:29:58Z http://coastwatch.pfeg.noaa.gov/griddap/erdQAwindmday.das";
    String infoUrl "https://coastwatch.pfeg.noaa.gov/infog/QA_ux10_las.html";
    String institution "NOAA NMFS SWFSC ERD";
    String keywords "advanced, altitude, ascat, atmosphere, atmospheric, coast, coastwatch, data, degrees, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, Earth Science > Oceans > Ocean Winds > Surface Winds, eumetsat, european, exploitation, global, meteorological, metop, near, near real time, noaa, node, nrt, ocean, oceans, organisation, QAux10, quality, real, satellites, scatterometer, surface, time, wcn, west, wind, winds, x_wind, 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 "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 75.0;
    String origin "EUMETSAT and NOAA|NESDIS";
    String processing_level "3";
    String project "CoastWatch (https://coastwatch.noaa.gov/)";
    String projection "geographic";
    String projection_type "mapped";
    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 "NOAA/NESDIS https://manati.star.nesdis.noaa.gov/products/ASCAT.php .";
    String satellite "METOP";
    String sensor "ASCAT";
    String source "satellite observation: METOP, ASCAT";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -75.0;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "NOAA CoastWatch distributes near real time wind data originating with wind velocity measurements from the ASCAT instrument onboard EUMETSAT's Metop-A satellite.  ASCAT is a microwave scatterometer designed to measure surface winds over the global ocean.  Wind velocity is processed to wind divergence by NOAA CoastWatch. (This is a monthly composite.)";
    String time_coverage_end "2018-09-16T00:00:00Z";
    String time_coverage_start "2009-10-16T12:00:00Z";
    String title "Wind, Metop-A ASCAT, 0.25°, Global, Near Real Time, 2009-present (Monthly)";
    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 (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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