Data Access Form

Dataset Title:	4x daily NMC reanalysis (1981) (pres.4Xday.1981-2010.ltm), 2.5°, 0001
Institution:	NOAA NWS NCEP, NCAR (Dataset ID: noaa_psl_b846_c35e_571e)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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

latitude (degrees_north)	73	-2.5 (even)

longitude (degrees_east)	144	2.5 (even)

Grid Variables (which always also download all of the dimension variables)

pres (4xDaily Long Term Mean Pressure at surface, Pascals)

valid_yr_count (count of non-missing values used in mean)

File type: (more information)

(Documentation / Bypass this form)

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

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 delta_t "0000-00-00 06:00:00";
    String ioos_category "Time";
    String long_name "Time";
    Float64 ltm_range 1.7356368e+7, 1.761933e+7;
    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 ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 0.0, 357.5;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  pres {
    Float32 actual_range 49934.668, 108918.336;
    Float64 colorBarMaximum 105000.0;
    Float64 colorBarMinimum 95000.0;
    String drawLandMask "under";
    Int16 GRIB_id 1;
    String GRIB_name "PRES";
    String ioos_category "Pressure";
    Int16 least_significant_digit -1;
    String level_desc "Surface";
    String long_name "4xDaily Long Term Mean Pressure at surface";
    Float32 missing_value -9.96921e+36;
    String parent_stat "Individual Obs";
    Int16 precision -1;
    String standard_name "surface_air_pressure";
    String statistic "Long Term Mean";
    String units "Pascals";
    Float32 valid_range 40000.0, 115000.0;
    String var_desc "Pressure";
  }
  valid_yr_count {
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String drawLandMask "under";
    String ioos_category "Statistics";
    String long_name "count of non-missing values used in mean";
    Float32 missing_value 32767.0;
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.6.3,hdf5=1.10.5";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "Wesley.Ebisuzaki@noaa.gov";
    String creator_name "NOAA NWS NCEP, NCAR";
    String creator_type "institution";
    String creator_url "https://www.cpc.ncep.noaa.gov/products/wesley/reanalysis.html";
    String dataset_title "NCEP-NCAR Reanalysis 1";
    String description 
"Data is from NMC initialized reanalysis
(4x/day).  It consists of most variables interpolated to
pressure surfaces from model (sigma) surfaces.";
    Float64 Easternmost_Easting 357.5;
    Float64 geospatial_lat_max 90.0;
    Float64 geospatial_lat_min -90.0;
    Float64 geospatial_lat_resolution 2.5;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 357.5;
    Float64 geospatial_lon_min 0.0;
    Float64 geospatial_lon_resolution 2.5;
    String geospatial_lon_units "degrees_east";
    String history 
"Created 2011/06/28 by do4XdayLTM
Converted to chunked, deflated non-packed NetCDF4 2014/09
2024-11-21T15:24:39Z https://psl.noaa.gov/thredds/dodsC/Datasets/ncep.reanalysis.derived/surface/pres.4Xday.1981-2010.ltm.nc
2024-11-21T15:24:39Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_psl_b846_c35e_571e.das";
    String id "Datasets/ncep.reanalysis.derived/surface/pres.4Xday.1981-2010.ltm.nc";
    String infoUrl "http://www.psl.noaa.gov/data/gridded/data.ncep.reanalysis.html";
    String institution "NOAA NWS NCEP, NCAR";
    String keywords "2010.ltm, 4xdaily, air, atmosphere, atmospheric, center, centers, count, daily, data, day, earth, Earth Science > Atmosphere > Atmospheric Pressure > Surface Pressure, environmental, latitude, long, longitude, mean, meteorological, missing, national, ncar, ncep, nmc, noaa, non, non-missing, nws, prediction, pres, pres.4xday.1981, pres.4xday.1981-2010.ltm, pressure, reanalysis, research, science, service, statistics, surface, surface_air_pressure, term, time, used, valid_yr_count, values, weather";
    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.";
    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.psl.noaa.gov/data/gridded/data.ncep.reanalysis.html";
    String sourceUrl "https://psl.noaa.gov/thredds/dodsC/Datasets/ncep.reanalysis.derived/surface/pres.4Xday.1981-2010.ltm.nc";
    Float64 Southernmost_Northing -90.0;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary 
"4x daily National Meteorological Center (NMC) reanalysis (1981). Data is from NMC initialized reanalysis
(4x/day).  It consists of most variables interpolated to
pressure surfaces from model (sigma) surfaces.";
    String time_coverage_end "0001-12-31T18:00:00Z";
    String time_coverage_start "0001-01-01T00:00:00Z";
    String title "4x daily NMC reanalysis (1981) (pres.4Xday.1981-2010.ltm), 2.5°, 0001";
    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.

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