ERDDAP > griddap > Data Access Form

Dataset Title:	Once daily OLR (J74-A94) (olr.day.mean), 2.5°, 2002-present
Institution:	NOAA PSL   (Dataset ID: noaa_psl_fed0_17b2_96a6)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (UTC)				7905	1 day (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)

olr (Daily OLR, W/m^2)

File type: (more information) .asc - View OPeNDAP-style ISO-8859-1 comma-separated text. .csv - Download a ISO-8859-1 comma-separated text table (line 1: names; line 2: units; ISO 8601 times). .csvp - Download a ISO-8859-1 .csv file with line 1: name (units). Times are ISO 8601 strings. .csv0 - Download a ISO-8859-1 .csv file without column names or units. Times are ISO 8601 strings. .das - View the dataset's metadata via an ISO-8859-1 OPeNDAP Dataset Attribute Structure (DAS). .dds - View the dataset's structure via an ISO-8859-1 OPeNDAP Dataset Descriptor Structure (DDS). .dods - OPeNDAP clients use this to download the data in the DODS binary format. .esriAscii - Download an ISO-8859-1 ESRI ASCII file (latitude longitude data only; longitude must be all below or all above 180). .fgdc - View the dataset's UTF-8 FGDC .xml metadata. .graph - View a Make A Graph web page. .help - View a web page with a description of griddap. .html - View an OPeNDAP-style HTML Data Access Form. .htmlTable - View a UTF-8 .html web page with the data in a table. Times are ISO 8601 strings. .iso19115 - View the dataset's ISO 19115-2/19139 UTF-8 .xml metadata. .itx - Download an ISO-8859-1 Igor Text File. Each axis variable and each data variable becomes a wave. .json - View a table-like UTF-8 JSON file (missing value = 'null'; times are ISO 8601 strings). .jsonlCSV1 - View a UTF-8 JSON Lines CSV file with column names on line 1 (mv = 'null'; times are ISO 8601 strings). .jsonlCSV - View a UTF-8 JSON Lines CSV file without column names (mv = 'null'; times are ISO 8601 strings). .jsonlKVP - View a UTF-8 JSON Lines file with Key:Value pairs (missing value = 'null'; times are ISO 8601 strings). .mat - Download a MATLAB binary file. .nc - Download a NetCDF-3 binary file with COARDS/CF/ACDD metadata. .ncHeader - View the UTF-8 header (the metadata) for the NetCDF-3 .nc file. .ncml - View the dataset's structure and metadata as a UTF-8 NCML .xml file. .nccsv - Download a NetCDF-3-like 7-bit ASCII NCCSV .csv file with COARDS/CF/ACDD metadata. .nccsvMetadata - View the dataset's metadata as the top half of a 7-bit ASCII NCCSV .csv file. .ncoJson - Download a UTF-8 NCO lvl=2 JSON file with COARDS/CF/ACDD metadata. .odvTxt - Download time,latitude,longitude,otherVariables as an ODV Generic Spreadsheet File (.txt). .timeGaps - View a UTF-8 list of gaps in the time values which are larger than the median gap. .tsv - Download a ISO-8859-1 tab-separated text table (line 1: names; line 2: units; ISO 8601 times). .tsvp - Download a ISO-8859-1 .tsv file with line 1: name (units). Times are ISO 8601 strings. .tsv0 - Download a ISO-8859-1 .tsv file without column names or units. Times are ISO 8601 strings. .wav - Download a .wav audio file. All columns must be numeric and of the same type. .xhtml - View a UTF-8 XHTML (XML) file with the data in a table. Times are ISO 8601 strings. .geotif - View a grayscale GeoTIFF .tif file (for latitude longitude data; longitude must be all below or all above 180). .kml - View a Google Earth .kml file (for latitude, longitude data only). .smallPdf - View a small .pdf image file with a graph or map. .pdf - View a standard, medium-sized .pdf image file with a graph or map. .largePdf - View a large .pdf image file with a graph or map. .smallPng - View a small .png image file with a graph or map. .png - View a standard, medium-sized .png image file with a graph or map. .largePng - View a large .png image file with a graph or map. .transparentPng - View a .png image file (just the data, without axes, landmask, or legend).

(Documentation / Bypass this form)
 
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.0098432e+9, 1.6927488e+9;
    String avg_period "0000-00-01 00:00:00";
    String axis "T";
    String delta_t "0000-00-01 00:00:00";
    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";
  }
  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";
  }
  olr {
    Float32 actual_range -447.4, 367.5;
    Float64 colorBarMaximum 400.0;
    Float64 colorBarMinimum -100.0;
    String ioos_category "Optical Properties";
    String level_desc "Other";
    String long_name "Daily OLR";
    Float32 missing_value -9.96921e+36;
    String parent_stat "Individual Obs";
    Int16 precision 2;
    String statistic "Mean";
    String units "W/m^2";
    Float32 valid_range 0.0, 500.0;
    String var_desc "Outgoing Longwave Radiation";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.7.0,hdf5=1.10.5,";
    String cdf_source_code 
"/data/map/OLR/rltime/append_nc
create_olr.f";
    String cdl_source_file 
"/data/map/OLR/rltime/append_nc.f
olr.cdl";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "NOAA PSL";
    String creator_type "institution";
    String creator_url "https://www.noaa.gov/";
    String dataset_title "NOAA Daily Outgoing Longwave Radiation (OLR)";
    String delta_time "once daily";
    String description 
"Data is from NCEP
 It consists of OLR uninterpolated from 2x/day";
    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 
"Thu Oct 26 13:57:26 2023: ncks -d time,,-26 olr.day.mean.nc olr.new.nc
Mon Oct 10 12:03:39 2005: ncks -d time,0,1375 olr.day.mean.nc RePairIngOlr.day.mean.nc
Wed Mar 30 14:01:37 2005: ncatted -a actual_range,time,o,d,17540448. , 17568624. skel.nc
/home/hoop/crdc/oldCRDC2COARDSv3/oldCRDC2COARDS Sat Dec  9 01:36:34 1995 from olr.7494.nc
created 08/28/2003 by aro (netCDF2.3)
Converted to chunked, deflated non-packed NetCDF4 2020/07
2024-04-27T17:14:40Z https://psl.noaa.gov/thredds/dodsC/Datasets/uninterp_OLR/olr.day.mean.nc
2024-04-27T17:14:40Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_psl_fed0_17b2_96a6.das";
    String id "Datasets/uninterp_OLR/olr.day.mean.nc";
    String infoUrl "http://www.psl.noaa.gov/data/gridded/data.uninterp_OLR.html";
    String institution "NOAA PSL";
    String keywords "a94, centers, daily, data, day, environmental, j74, j74-a94, latitude, longitude, longwave, national, ncep, noaa, olr, olr.day.mean, once, optical, optical properties, outgoing, prediction, properties, psl, radiation, time";
    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 NCO "netCDF Operators version 4.8.1 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Float64 Northernmost_Northing 90.0;
    String platform "Observation";
    String references "http://www.psl.noaa.gov/data/gridded/data.uninterp_OLR.html";
    String source_data_file 
"NCEP
J1974 to A1994";
    String sourceUrl "https://psl.noaa.gov/thredds/dodsC/Datasets/uninterp_OLR/olr.day.mean.nc";
    Float64 Southernmost_Northing -90.0;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary 
"Once daily Outgoing Longwave Radiation (OLR) (J74-A94). Data is from National Centers for Environmental Prediction (NCEP)
 It consists of OLR uninterpolated from 2x/day";
    String testOutOfDate "now-4days";
    String time_coverage_end "2023-08-23T00:00:00Z";
    String time_coverage_start "2002-01-01T00:00:00Z";
    String title "Once daily OLR (J74-A94) (olr.day.mean), 2.5°, 2002-present";
    Float64 Westernmost_Easting 0.0;
  }
}

 

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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
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.

 

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