Data Access Form

Dataset Title:	The GEBCO_2014 Grid - a continuous terrain model for oceans and land at 30 arc- second intervals.
Institution:	GEBCO, BODC . (Dataset ID: GEBCO2014_NORTHERN_HEM)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	1	(just one value)

latitude (degrees_north)	10801	0.008333333 (even)

longitude (degrees_east)	43200	0.008333333 (even)

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

elevation (Elevation relative to sea level, m)

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 1.4175648e+9, 1.4175648e+9;
    String axis "T";
    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";
    Float64 actual_range -0.004166666666666667, 89.99583333333334;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String sdn_parameter_name "Latitude north";
    String sdn_parameter_urn "SDN:P01::ALATZZ01";
    String sdn_uom_name "Degrees north";
    String sdn_uom_urn "SDN:P06:DEGN";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -179.99583333333334, 179.99583333332703;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String sdn_parameter_name "Longitude east";
    String sdn_parameter_urn "SDN:P01::ALONZZ01";
    String sdn_uom_name "Degrees east";
    String sdn_uom_urn "SDN:P06::DEGE";
    String standard_name "longitude";
    String units "degrees_east";
  }
  elevation {
    String ioos_category "Location";
    String long_name "Elevation relative to sea level";
    String sdn_parameter_name "Sea floor height (above mean sea level) {bathymetric height}";
    String sdn_parameter_urn "SDN:P01::BATHHGHT";
    String sdn_uom_name "Metres";
    String sdn_uom_urn "SDN:P06:ULAA";
    String standard_name "height_above_reference_ellipsoid";
    String units "m";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.internal.dataset.conv.CF1Convention";
    String cdm_data_type "Grid";
    String comment "The data in the GEBCO_2014 Grid should not be used for navigation or any purpose relating to safety at sea.";
    String Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String creator_name "GEBCO, BODC .";
    Float64 Easternmost_Easting 179.99583333332703;
    Float64 geospatial_lat_max 89.99583333333334;
    Float64 geospatial_lat_min -0.004166666666666667;
    Float64 geospatial_lat_resolution 0.008333333333333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.99583333332703;
    Float64 geospatial_lon_min -179.99583333333334;
    Float64 geospatial_lon_resolution 0.008333333333333188;
    String geospatial_lon_units "degrees_east";
    String History 
"Translated to CF-1.0 Conventions by Netcdf-Java CDM (NetcdfCFWriter)
Original Dataset = /local/webassdata/grid/gebco/GEBCO_2014_2D_301801.nc; Translation Date = Mon May 04 21:49:00 BST 2015";
    String history 
"Tue May  5 08:08:12 2015: ncpdq -O -a lat,lon GEBCO_2014_2D_-180.0_0.0_180.0_90.0_lon.nc GEBCO_2014_2D_-180.0_0.0_180.0_90.0.nc
Tue May  5 07:59:25 2015: ncrcat -O GEBCO_2014_2D_-180.0_0.0_0.0_90.0_lon2.nc GEBCO_2014_2D_0.0_0.0_180.0_90.0_lon.nc GEBCO_2014_2D_-180.0_0.0_180.0_90.0_lon.nc
Tue May  5 07:57:28 2015: ncks -d lon,-180.0,0.0 GEBCO_2014_2D_-180.0_0.0_0.0_90.0_lon.nc GEBCO_2014_2D_-180.0_0.0_0.0_90.0_lon2.nc
Tue May  5 07:15:12 2015: ncrcat -O tmpleft.nc tmpright.nc out.nc
Tue May  5 07:13:28 2015: ncks -O --mk_rec_dmn lon tmpleft.nc tmpleft.nc
Tue May  5 07:12:51 2015: ncpdq -O -a lon,lat test.nc tmpleft.nc
Tue May  5 07:05:07 2015: ncea -d lon,-180.0,-90.0 GEBCO_2014_2D_-180.0_0.0_-90.0_90.0.nc test.nc
This is version 20150318 of the data set. Information on the history of the data set can be found in the data set documentation available from the internet: http://www.gebco.net/data_and_products/gridded_bathymetry_data/
2023-06-06T12:12:36Z (local files)
2023-06-06T12:12:36Z http://erddap.axiomdatascience.com/erddap/griddap/GEBCO2014_NORTHERN_HEM.das";
    String infoUrl "???";
    String institution "GEBCO, BODC .";
    String keywords "above, arc, arc-second, bodc, continuous, Earth Science > Oceans > Sea Surface Topography > Sea Surface Height, elevation, ellipsoid, gebco, grid, height, height_above_reference_ellipsoid, intervals, land, level, model, oceans, reference, relative, sea, second, surface, terrain, topography";
    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 Metadata_Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String NCO "4.4.8";
    Int32 nco_openmp_thread_number 1;
    Int32 node_offset 1;
    Float64 Northernmost_Northing 89.99583333333334;
    String original_institution "On behalf of the General Bathymetric Chart of the Oceans (GEBCO), the data are held at the British Oceanographic Data Centre (BODC).";
    String references "Information on the data set is available from the GEBCO project web pages: http://www.gebco.net/data_and_products/gridded_bathymetry_data/";
    String source "The bathymetric portion of the GEBCO_2014 Grid was largely developed from a database of ship track soundings with interpolation between soundings guided by satellite-derived gravity data. In areas where they improve on this existing base grid, data sets developed by other methods are included. Recognising the importance of local expertise when building a global bathymetric model, GEBCO have been working with regional mapping groups to improve the existing GEBCO grid. Details about the development of the grid and the data sets included can be found in the documentation that accompanies the data set. With the exception of polar regions, land data are based on the 1-km averages of topography derived from version 2.0 of the US Geological Survey SRTM30 gridded digital elevation model data product, created with data from the US National Aeronautics and Space Administration (NASA) Shuttle Radar Topography Mission. For the Arctic region north of 64N the GEBCO grid is based on the International Bathymetric Chart of the Arctic Ocean (IBCAO) v3. This data set uses land data taken largely from the Global Multi-resolution Terrain Elevation Data 2010 (GMTED2010) data set. Over Greenland the approximately 2000 by 2000 m resolution Digital Elevation Model (DEM) published by Ekholm (1996) is used. For the Southern Ocean area, south of 60S, land data are taken from Bedmap2 data set as included in the International Bathymetric Chart of the Southern Ocean (IBCSO). The grid is accompanied by a Source Identifier grid, which identifies which grid cells are based on soundings or existing grids and which have been interpolated. The grid uses the convention that depths are negative.";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -0.004166666666666667;
    String standard_name_vocabulary "CF-12";
    String summary "The data in the GEBCO_2014 Grid should not be used for navigation or any purpose relating to safety at sea.";
    String time_coverage_end "2014-12-03T00:00:00Z";
    String time_coverage_start "2014-12-03T00:00:00Z";
    String title "The GEBCO_2014 Grid - a continuous terrain model for oceans and land at 30 arc-second intervals.";
    Float64 Westernmost_Easting -179.99583333333334;
  }
}

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.