Data Access Form

Dataset Title:	Global Forecast System (GFS) model - Relative humidity at ground level
Institution:	NOAA (Dataset ID: noaa_forecast_gfs_humidity)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	123	1h 0m 0s (even)

latitude (degrees_north)	721	-0.25 (even)

longitude (degrees_east)	1440	0.25 (even)

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

Relative_humidity_height_above_ground

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 1.775088e+9, 1.7755272e+9;
    String axis "T";
    String calendar "proleptic_gregorian";
    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, 359.75;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  Relative_humidity_height_above_ground {
    String long_name "Relative Humidity Height Above Ground";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_name "NOAA";
    String creator_type "institution";
    String creator_url "https://www.noaa.gov/";
    String documentation "https://s4raise.it/dssmare/metocean_models/, https://raise-spoke3.s4raise.it/";
    Float64 Easternmost_Easting 359.75;
    Float64 geospatial_lat_max 90.0;
    Float64 geospatial_lat_min -90.0;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.75;
    Float64 geospatial_lon_min 0.0;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    String history 
"2026-04-03T04:34:17Z (local files)
2026-04-03T04:34:17Z https://erddap.s4raise.it/erddap/griddap/noaa_forecast_gfs_humidity.das";
    String infoUrl "http://188.166.63.249/thredds/dodsC/SINDBAD-GFS-1HR/SINDBAD-GFS-Relative_humidity_height_above_ground.nc.html";
    String inspire "Oceanographic geographical features";
    String institution "NOAA";
    String institution_country "US";
    String institution_edmo_code "1433";
    String keywords "Relativity Humidity (a249c68f-8249-4285-aad2-020b3c5aefc3)";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "CC-BY 4.0";
    String maintainer "ETT S.p.A.";
    String model_realtime "true";
    String naming_authority "NOAA";
    Float64 Northernmost_Northing 90.0;
    String owner "NOAA";
    String owner_url "https://www.noaa.gov/";
    String project_code "NOAA";
    String project_name "National Oceanic and Atmospheric Administration";
    String project_url "https://www.noaa.gov/";
    String publisher "ETT S.p.A.";
    String references "https://www.ncei.noaa.gov/products/weather-climate-models/global-forecast";
    String source "Global Forecast System (GFS) model";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -90.0;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Global Forecast System (GFS) model - Relative humidity at ground level";
    String testOutOfDate "now+4days";
    String time_coverage_end "2026-04-07T02:00:00Z";
    String time_coverage_start "2026-04-02T00:00:00Z";
    String title "Global Forecast System (GFS) model - Relative humidity at ground level";
    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://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.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.