Data Access Form

Dataset Title:	8x Daily NARR (monolevel, hlcy lat lon) [time][y][x]
Institution:	National Centers for Environmental Prediction (Dataset ID: noaa_pmel_f581_04cc_77a7)
Information:	Summary \| License \| Metadata \| Background \| Make a graph

Dimensions	Size	Spacing
time (UTC)	97880	3h 0m 0s (even)

y (northward distance from southwest corner of domain in projection coordinates, m)	277	32463.0 (even)

x (eastward distance from southwest corner of domain in projection coordinates, m)	349	32462.99 (even)

Grid Variables (which always also download all of the dimension variables)
hlcy (3-hourly Storm Relative Helicity, m^2/s^2)

File type: more info
Documentation / Bypass this form

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

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 2.839968e+8, 1.34109e+9;
    String axis "T";
    String coordinate_defines "point";
    String delta_t "0000-00-00 03:00:00";
    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";
  }
  y {
    Float32 actual_range 0.0, 8959788.0;
    String ioos_category "Location";
    String long_name "northward distance from southwest corner of domain in projection coordinates";
    String standard_name "projection_y_coordinate";
    String units "m";
  }
  x {
    Float32 actual_range 0.0, 1.129712E7;
    String ioos_category "Location";
    String long_name "eastward distance from southwest corner of domain in projection coordinates";
    String standard_name "projection_x_coordinate";
    String units "m";
  }
  hlcy {
    String _CoordinateAxes "lat lon time y x";
    Float32 _FillValue -1200.1;
    Float32 actual_range 2023.131, 2300.039;
    Float64 colorBarMaximum 2400.0;
    Float64 colorBarMinimum 2000.0;
    String coordinates "lat lon";
    String dataset "NARR 3-hourly";
    Int32 GRIB_id 190;
    String GRIB_name "HLCY";
    String grid_mapping "Lambert_Conformal";
    String ioos_category "Meteorology";
    String level_desc "0-3000m above ground level";
    String long_name "3-hourly Storm Relative Helicity";
    Float32 missing_value 5353.2;
    String parent_stat "Other";
    Int16 precision 1;
    String statistic "Individual Obs";
    String units "m^2/s^2";
    Float32 unpacked_valid_range -1200.0, 2800.0;
    Int16 valid_range -32766, 7234;
    String var_desc "Storm Relative Helicity";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    Float64 centerlat 50.0;
    Float64 centerlon -107.0;
    String Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String creator_name "National Centers for Environmental Prediction";
    String creator_url "http://ferret.pmel.noaa.gov/geoide/dodsC/Datasets/NARR/monolevel/hlcy_lat_lon_aggregation.html";
    String history 
"created 2012/06 by data management at NOAA/ESRL/PSD
2013-03-18T10:26:12Z http://ferret.pmel.noaa.gov/geoide/dodsC/Datasets/NARR/monolevel/hlcy_lat_lon_aggregation
2013-03-18T10:26:12Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_pmel_f581_04cc_77a7.das";
    String infoUrl "http://ferret.pmel.noaa.gov/geoide/dodsC/Datasets/NARR/monolevel/hlcy_lat_lon_aggregation.html";
    String institution "National Centers for Environmental Prediction";
    String keywords 
"3-hourly, centers, daily, environmental, helicity, hlcy, hourly, meteorology,
monolevel, narr, national, prediction, relative, storm";
    Float32 latcorners 1.000001, 0.897945, 46.3544, 46.63433;
    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.";
    Float32 loncorners -145.5, -68.32005, -2.569891, 148.6418;
    String Metadata_Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String platform "Model";
    String references 
"http://wwwt.emc.ncep.noaa.gov/mmb/rreanl/index.html
http://www.esrl.noaa.gov/psd/data/gridded/data.narr.html";
    String sourceUrl "http://ferret.pmel.noaa.gov/geoide/dodsC/Datasets/NARR/monolevel/hlcy_lat_lon_aggregation";
    String standard_name_vocabulary "CF-12";
    Float64 standardpar1 50.0;
    Float64 standardpar2 50.000001;
    String stream "s1";
    String summary 
"8x Daily NARR
(monolevel, hlcy lat lon)";
    String time_coverage_end "2012-06-30T21:00:00Z";
    String time_coverage_start "1979-01-01T00:00:00Z";
    String title "8x Daily NARR (monolevel, hlcy lat lon) [time][y][x]";
  }
}

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://upwell.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
http://upwell.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.

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