Data Access Form

Dataset Title:	HYCOM GLBa0.08 1/12 deg HYCOM + NCODA Global Hindcast Analysis (Combined), 2008-2018 [time][Depth][Y][X]
Institution:	Naval Research Laboratory (Dataset ID: hycom_GLBa008_tdyx)
Information:	Summary \| License \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	3723	1 day (even)

Depth (m)	33	171.875 (uneven)

Y	3298	1.0 (even)

X	4500	1.0 (even)

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

u (u-veloc. [91.1H], m/s)

v (v-veloc. [91.1H], m/s)

temperature (temp [91.1H], degC)

salinity (Practical Salinity [90.8H], PSU)

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 1.221696e+9, 1.5432768e+9;
    String axis "T";
    String calendar "standard";
    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";
  }
  Depth {
    Float32 actual_range 0.0, 5500.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Depth";
    String positive "down";
    String standard_name "depth";
    String units "m";
  }
  Y {
    Int32 actual_range 1, 3298;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Y";
    String point_spacing "even";
  }
  X {
    Int32 actual_range 1, 4500;
    String axis "X";
    String ioos_category "Location";
    String long_name "X";
    String point_spacing "even";
  }
  u {
    String _CoordinateAxes "Longitude Latitude Date MT Depth Y X";
    Float32 _FillValue 1.267651e+30;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordinates "Longitude Latitude Date";
    String ioos_category "Currents";
    String long_name "u-veloc. [91.1H]";
    String standard_name "eastward_sea_water_velocity";
    String units "m/s";
  }
  v {
    String _CoordinateAxes "Longitude Latitude Date MT Depth Y X";
    Float32 _FillValue 1.267651e+30;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordinates "Longitude Latitude Date";
    String ioos_category "Currents";
    String long_name "v-veloc. [91.1H]";
    String standard_name "northward_sea_water_velocity";
    String units "m/s";
  }
  temperature {
    String _CoordinateAxes "Longitude Latitude Date MT Depth Y X";
    Float32 _FillValue 1.267651e+30;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String coordinates "Longitude Latitude Date";
    String ioos_category "Temperature";
    String long_name "temp [91.1H]";
    String standard_name "sea_water_potential_temperature";
    String units "degC";
  }
  salinity {
    String _CoordinateAxes "Longitude Latitude Date MT Depth Y X";
    Float32 _FillValue 1.267651e+30;
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String coordinates "Longitude Latitude Date";
    String ioos_category "Salinity";
    String long_name "Practical Salinity [90.8H]";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.0, COARDS, ACDD-1.3";
    String creator_email "George.Halliwell@noaa.gov";
    String creator_name "Naval Research Laboratory, HYCOM";
    String creator_type "institution";
    String experiment "91.1";
    String history 
"archv2ncdf2d for run date 2016010218
2023-09-28T01:08:20Z https://tds.hycom.org/thredds/dodsC/glb_analysis
2023-09-28T01:08:20Z http://coastwatch.pfeg.noaa.gov/erddap/griddap/hycom_GLBa008_tdyx.das";
    String infoUrl "https://www.hycom.org/dataserver/gofs-3pt0/analysis/";
    String institution "Naval Research Laboratory";
    String keywords "60.5h, 90.8h, circulation, currents, density, Earth Science > Oceans > Ocean Circulation > Ocean Currents, Earth Science > Oceans > Ocean Temperature > Potential Temperature, Earth Science > Oceans > Salinity/Density > Salinity, eastward, eastward_sea_water_velocity, glba0.08, hycom, laboratory, naval, northward, northward_sea_water_velocity, ocean, oceans, potential, research, salinity, sea, sea_water_potential_temperature, sea_water_practical_salinity, seawater, temperature, u-velocity, v-velocity, velocity, water";
    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.";
    String publisher_email "hycomdata@coaps.fsu.edu";
    String publisher_name "FSU COAPS";
    String publisher_url "http://www.coaps.fsu.edu/";
    String source "HYCOM archive file";
    String sourceUrl "https://tds.hycom.org/thredds/dodsC/glb_analysis";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "HYbrid Coordinate Ocean Model (HYCOM) GLBa0.08 from Hycom.  The hybrid coordinate is one that is isopycnal in the open, stratified ocean, but smoothly reverts to a terrain-following coordinate in shallow coastal regions, and to z-level coordinates in the mixed layer and/or unstratified seas. The hybrid coordinate extends the geographic range of applicability of traditional isopycnic coordinate circulation models (the basis of the present hybrid code), such as the Miami Isopycnic Coordinate Ocean Model (MICOM) and the Navy Layered Ocean Model (NLOM), toward shallow coastal seas and unstratified parts of the world ocean.";
    String time_coverage_end "2018-11-27T00:00:00Z";
    String time_coverage_start "2008-09-18T00:00:00Z";
    String title "HYCOM GLBa0.08 1/12 deg HYCOM + NCODA Global Hindcast Analysis (Combined), 2008-2018 [time][Depth][Y][X]";
  }
}

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.