Data Access Form

Dataset Title:	4Xdaily ltm ulwrf.ntat from the NCEP Reanalysis (ulwrf.ntat.4Xday.ltm), 0001
Institution:	NOAA NWS NCEP, NCAR (Dataset ID: noaa_psl_1d8c_cdd0_7be1)
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)	94	-1.904129 (uneven)

longitude (degrees_east)	192	1.875 (even)

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

ulwrf (Long Term Mean Upward Longwave Radiation Flux, W/m^2)

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 "1991/01/01 00Z - 2020/12/31 18Z";
    String delta_t "0000-00-00 06:00:00";
    String ioos_category "Time";
    String long_name "Time";
    Float64 ltm_range 1674264.0, 1937250.0;
    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 -88.542, 88.542;
    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, 358.125;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  ulwrf {
    Float32 actual_range 86.6, 380.4;
    Float64 colorBarMaximum 500.0;
    Float64 colorBarMinimum -500.0;
    String drawLandMask "under";
    Int16 GRIB_id 212;
    String GRIB_name "ULWRF";
    String ioos_category "Heat Flux";
    Int16 least_significant_digit 0;
    String level_desc "Nominal top of atmosphere";
    String long_name "Long Term Mean Upward Longwave Radiation Flux";
    Float32 missing_value -9.96921e+36;
    String parent_stat "Mean";
    Int16 precision 1;
    String statistic "Long Term Mean";
    String units "W/m^2";
    Float32 valid_range -100.0, 1000.0;
    String var_desc "Upward Longwave Radiation Flux";
  }
  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";
    Int16 missing_value 32767;
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.7.0,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 358.125;
    Float64 geospatial_lat_max 88.542;
    Float64 geospatial_lat_min -88.542;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 358.125;
    Float64 geospatial_lon_min 0.0;
    Float64 geospatial_lon_resolution 1.875;
    String geospatial_lon_units "degrees_east";
    String history 
"Created 2022/02/15 by do4XdayLTMNC4
2024-11-23T10:16:00Z https://psl.noaa.gov/thredds/dodsC/Datasets/ncep.reanalysis.derived/other_gauss/ulwrf.ntat.4Xday.ltm.nc
2024-11-23T10:16:00Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_psl_1d8c_cdd0_7be1.das";
    String id "Datasets/ncep.reanalysis.derived/other_gauss/ulwrf.ntat.4Xday.ltm.nc";
    String infoUrl "http://www.psl.noaa.gov/data/gridded/data.ncep.reanalysis.html";
    String institution "NOAA NWS NCEP, NCAR";
    String keywords "4xdaily, atmospheric, center, centers, count, data, environmental, flux, heat, heat flux, latitude, long, longitude, longwave, ltm, mean, meteorological, missing, national, ncar, ncep, nmc, noaa, non, non-missing, nws, prediction, radiation, reanalysis, research, service, statistics, term, time, ulwrf, ulwrf.ntat, ulwrf.ntat.4xday.ltm, upward, used, valid_yr_count, values, weather";
    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 88.542;
    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/other_gauss/ulwrf.ntat.4Xday.ltm.nc";
    Float64 Southernmost_Northing -88.542;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary 
"4Xdaily ltm ulwrf.ntat from the National Centers for Environmental Prediction (NCEP) Reanalysis. Data is from National Meteorological Center (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 "4Xdaily ltm ulwrf.ntat from the NCEP Reanalysis (ulwrf.ntat.4Xday.ltm), 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.