Data Access Form

Dataset Title:	Navy Global Environmental Model (NAVGEM), 0.5 degree, 2013-present, 500 hPa Height
Institution:	FNMOC (Dataset ID: erdNavgem05D500mb)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	15845	6h 30m 25s (uneven)

isobaric (Isobaric surface, hPa)	1	(just one value)

latitude (degrees_north)	361	0.5 (even)

longitude (degrees_east)	720	0.5 (even)

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

geop_ht_isobaric (Geopotential Height (500 hPa), gpm)

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 1.3609296e+9, 1.7320824e+9;
    String axis "T";
    String calendar "proleptic_gregorian";
    String ioos_category "Time";
    String long_name "GRIB forecast or observation time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  isobaric {
    Float32 actual_range 500.0, 500.0;
    Int32 Grib_level_type 100;
    String ioos_category "Pressure";
    String long_name "Isobaric surface";
    String positive "down";
    String units "hPa";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -90.00001, 89.99999;
    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, 359.5;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  geop_ht_isobaric {
    Float64 colorBarMaximum 6500.0;
    Float64 colorBarMinimum 4000.0;
    String description "The height of a given point in the atmosphere in units proportional to the potential energy of unit mass geopotential at this height relative to sea level";
    Int32 Grib1_Center 58;
    String Grib1_Interval_Name "Unknown Time Range Indicator -1";
    Int32 Grib1_Interval_Type -1;
    String Grib1_Level_Desc "Isobaric surface";
    Int32 Grib1_Level_Type 100;
    Int32 Grib1_Parameter 7;
    String Grib1_Parameter_Name "geop_ht";
    Int32 Grib1_Subcenter 0;
    Int32 Grib1_TableVersion 3;
    String Grib_Variable_Id "VAR_58-0-3-7_L100";
    String ioos_category "Pressure";
    String long_name "Geopotential Height (500 hPa)";
    Float32 missing_value NaN;
    String standard_name "geopotential_height";
    String units "gpm";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "CSO.navo.fct@navy.mil";
    String creator_name "FNMOC";
    String creator_type "institution";
    String creator_url "https://www.usno.navy.mil/FNMOC/";
    Float64 Easternmost_Easting 359.5;
    String file_format "GRIB-1";
    Float64 geospatial_lat_max 89.99999;
    Float64 geospatial_lat_min -90.00001;
    Float64 geospatial_lat_resolution 0.5;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.5;
    Float64 geospatial_lon_min 0.0;
    Float64 geospatial_lon_resolution 0.5;
    String geospatial_lon_units "degrees_east";
    String GRIB_table_version "0,3";
    Float64 grid_mapping_earth_radius 6367470.0;
    String grid_mapping_name "latitude_longitude";
    String history 
"Read using CDM IOSP GribCollection v3
2024-11-21T12:08:16Z (local files)
2024-11-21T12:08:16Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdNavgem05D500mb.das";
    String infoUrl "https://en.wikipedia.org/wiki/NAVGEM";
    String institution "FNMOC";
    String keywords "altitude, atmosphere, center, data, earth, Earth Science > Atmosphere > Altitude > Geopotential Height, energy, fleet, fnmoc, geop_ht_isobaric, geopotential, geopotential_height, given, height, isobaric, level, local, mas, meteorology, monterey, numerical, oceanography, point, potential, proportional, relative, science, sea, sea level, source, states, surface, time, unit, united, units";
    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 89.99999;
    String Originating_or_generating_Center "Fleet Numerical Meteorology and Oceanography Center, Monterey, CA, United States";
    String Originating_or_generating_Subcenter "0";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -90.00001;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Navy Global Environmental Model (NAVGEM) is a global numerical weather prediction computer model. It replaced NOGAPS as the prime model in the middle of February 2013 at the Navy Fleet Numerical Meteorology and Oceanography Center (FNMOC) Weather model synoptic site. [Wikipedia]";
    String testOutOfDate "now-2days";
    String time_coverage_end "2024-11-20T06:00:00Z";
    String time_coverage_start "2013-02-15T12:00:00Z";
    String title "Navy Global Environmental Model (NAVGEM), 0.5 degree, 2013-present, 500 hPa Height";
    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.