Data Access Form

Dataset Title:	4x Daily NOAA-CIRES 20th Century Reanalysis (monolevel, rhum.sig995.4Xday.ltm)
Institution:	NOAA ESRL/PSD (Dataset ID: noaa_esrl_591c_9f3e_6604)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

Dimensions	Size	Spacing
time (UTC)	1460	6h 0m 0s (even)

latitude (degrees_north)	91	-2.0 (even)

longitude (degrees_east)	180	2.0 (even)

Grid Variables (which always also download all of the dimension variables)
rhum (Long Term Mean 6-hourly Relative Humidity at sigma level 0.995, percent)
valid_yr_count (count of non-missing values used in mean)

File type: more info
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range -6.21357696e+10, -6.21042552e+10;
    String avg_period "0030-00-00 00:00:00";
    String axis "T";
    String climatology "climatology_bounds";
    String climo_period "1981/01/01 00Z - 2010/12/31 18Z";
    String coordinate_defines "point";
    String delta_t "0000-00-00 06:00:00";
    String ioos_category "Time";
    String long_name "Time";
    Float64 ltm_range 1586616.0, 1849578.0;
    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";
    Float32 actual_range 90.0, -90.0;
    String axis "Y";
    String coordinate_defines "point";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 0.0, 358.0;
    String axis "X";
    String coordinate_defines "point";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  rhum {
    Float32 actual_range 1.566667, 100.0;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String dataset "NOAA-CIRES 20th Century Reanalysis version 2";
    Int16 GRIB_id 52;
    String GRIB_name "RH";
    String ioos_category "Meteorology";
    String level_desc "sigma level 0.995";
    String long_name "Long Term Mean 6-hourly Relative Humidity at sigma level 0.995";
    Float32 missing_value -9.96921E36;
    String parent_stat "Ensemble Mean";
    Int16 precision 1;
    String standard_name "relative_humidity";
    String statistic "Long Term Mean";
    String units "percent";
    Float32 valid_range 0.0, 100.0;
    String var_desc "Relative Humidity";
  }
  valid_yr_count {
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Statistics";
    String long_name "count of non-missing values used in mean";
    Float32 missing_value NaN;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String citation 
"Compo,G.P. <http://www.esrl.noaa.gov/psd/people/gilbert.p.compo>, 
J.S. Whitaker <http://www.esrl.noaa.gov/psd/people/jeffrey.s.whitaker>,
 and P.D. Sardeshmukh, 2006: Feasibility of a 100 year reanalysis using
 only surface pressure data.
 <http://www.esrl.noaa.gov/psd/people/gilbert.p.compo/Compoetal2006.pdf>
 /Bull. Amer. Met. Soc./, 87, 175-190.";
    String comments 
"Data is from 
NOAA-CIRES 20th Century Reanalysis version 2
(4x/day).  It consists of most variables interpolated to
pressure surfaces from model (sigma) surfaces.";
    String Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String creator_name "NOAA ESRL/PSD";
    String creator_url "http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/20thC_ReanV2/Derived/4Xdailies/monolevel/rhum.sig995.4Xday.ltm.nc.html";
    Float64 Easternmost_Easting 358.0;
    Float64 geospatial_lat_max 90.0;
    Float64 geospatial_lat_min -90.0;
    Float64 geospatial_lat_resolution 2.0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 358.0;
    Float64 geospatial_lon_min 0.0;
    Float64 geospatial_lon_resolution 2.0;
    String geospatial_lon_units "degrees_east";
    String history 
"Created 2012/05/30 by do4XdayLTM
2013-03-09T02:13:22Z http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/20thC_ReanV2/Derived/4Xdailies/monolevel/rhum.sig995.4Xday.ltm.nc
2013-03-09T02:13:22Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_esrl_591c_9f3e_6604.das";
    String infoUrl "http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/20thC_ReanV2/Derived/4Xdailies/monolevel/rhum.sig995.4Xday.ltm.nc.html";
    String institution "NOAA ESRL/PSD";
    String keywords 
"20th, 6-hourly, atmosphere,
Atmosphere > Atmospheric Water Vapor > Humidity,
atmospheric, century, cires, count, daily, esrl, hourly, humidity, level,
long, mean, meteorology, missing, monolevel, noaa, noaa-cires, non,
non-missing, psd, reanalysis, relative, relative_humidity,
rhum.sig995.4xday.ltm, sigma, statistics, term, used, values, vapor, water";
    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 "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    Float64 Northernmost_Northing 90.0;
    String not_missing_threshold_percent "minimum 3% values input to have non-missing output value";
    String platform "Model";
    String references "http://www.esrl.noaa.gov/psd/data/gridded/data.20thC_ReanV2.html";
    String sourceUrl "http://www.esrl.noaa.gov/psd/thredds/dodsC/Datasets/20thC_ReanV2/Derived/4Xdailies/monolevel/rhum.sig995.4Xday.ltm.nc";
    Float64 Southernmost_Northing -90.0;
    String standard_name_vocabulary "CF-12";
    String summary 
"4x Daily NOAA-CIRES 20th Century Reanalysis
(monolevel, rhum.sig995.4Xday.ltm)";
    String time_coverage_end "0001-12-31T18:00:00Z";
    String time_coverage_start "0001-01-01T00:00:00Z";
    String title "4x Daily NOAA-CIRES 20th Century Reanalysis (monolevel, rhum.sig995.4Xday.ltm)";
    String version "2.0";
    Float64 Westernmost_Easting 0.0;
  }
}

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temperature data from a satellite), via a specially formed URL. griddap uses the
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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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