ERDDAP > griddap > Data Access Form

Dataset Title:	Bathymetry and Topography, NCEI ETOPO 2022, 30 Arc-Second, Global (Ice Surface)
Institution:	NOAA NCEI   (Dataset ID: ETOPO_2022_v1_30s)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
latitude (degrees_north)				21600	0.008333333 (even)
longitude (degrees_east)				43200	0.008333333 (even)

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

z (meters)

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). .parquet - Download as a parquet file. Metadata contains column names ("column_names") and units ("column_units"). .parquetWMeta - Download as a parquet file with detailed metadata. .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).

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.99583333333334, 89.99583333333334;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 0.004166666666662877, 359.99583333333334;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_max 360.0;
    Float64 valid_min 0.0;
  }
  z {
    Float32 _FillValue -99999.0;
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "Topography";
    String ioos_category "Bathymetry";
    String long_name "z";
    String positive "up";
    String standard_name "height";
    String units "meters";
    String vert_crs_epsg "EPSG:3855";
    String vert_crs_name "EGM2008";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "Barry.Eakins@noaa.gov";
    String creator_name "NOAA NCEI";
    String creator_type "institution";
    String creator_url "https://www.ngdc.noaa.gov/mgg/global/global.html";
    String defaultGraphQuery "z[(0.0):(60.0)][(120.0):(260.0)]&.draw=surface&.vars=longitude|latitude|z";
    Float64 Easternmost_Easting 359.99583333333334;
    String GDAL "GDAL 3.3.2, released 2021/09/01";
    String GDAL_AREA_OR_POINT "Area";
    String GDAL_TIFFTAG_COPYRIGHT "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce";
    Float64 GDAL_TIFFTAG_DATETIME 2.0220929123913e+13;
    String GDAL_TIFFTAG_IMAGEDESCRIPTION "Topography-Bathymetry; EGM2008 height";
    Float64 geospatial_lat_max 89.99583333333334;
    Float64 geospatial_lat_min -89.99583333333334;
    Float64 geospatial_lat_resolution 0.008333333333333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.99583333333334;
    Float64 geospatial_lon_min 0.004166666666662877;
    Float64 geospatial_lon_resolution 0.008333333333333333;
    String geospatial_lon_units "degrees_east";
    String grid_mapping_GeoTransform "-180 0.008333333333333333 0 90 0 -0.008333333333333333";
    Float64 grid_mapping_inverse_flattening 298.257223563;
    String grid_mapping_long_name "CRS definition";
    Float64 grid_mapping_longitude_of_prime_meridian 0.0;
    String grid_mapping_name "latitude_longitude";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    String grid_mapping_spatial_ref "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AXIS[\"Latitude\",NORTH],AXIS[\"Longitude\",EAST],AUTHORITY[\"EPSG\",\"4326\"]]";
    String history 
"Tue Oct 17 10:30:12 2023: ncatted -O -a sw_point_longitude,global,o,f,0.02083333 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:30:12 2023: ncatted -O -a geospatial_lon_min,global,o,f,0.0 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:30:12 2023: ncatted -O -a geospatial_lon_max,global,o,f,360.0 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:30:12 2023: ncatted -O -a easternmost_longitude,global,o,f,360.0 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:30:12 2023: ncatted -O -a westernmost_longitude,global,o,f,0.0 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:30:12 2023: ncatted -O -a valid_max,lon,o,f,360.0 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:30:12 2023: ncatted -O -a valid_min,lon,o,f,0.0 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:28:29 2023: ncap2 -O -s where(lon<0) lon=lon+360 ETOPO_2022_v1_30s_N90W180_surface-0-360.nc ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
Tue Oct 17 10:26:43 2023: ncks -O --msa_usr_rdr -d lon,0.0,180.0 -d lon,-180.0,0.0 ETOPO_2022_v1_30s_N90W180_surface.nc ETOPO_2022_v1_30s_N90W180_surface-0-360.nc
2025-05-24T22:17:33Z (local files)
2025-05-24T22:17:33Z http:/oceanwatch.pfeg.noaa.gov/noaa_wide/erddap/griddap/ETOPO_2022_v1_30s.das";
    String infoUrl "https://www.ngdc.noaa.gov/mgg/global/global.html";
    String institution "NOAA NCEI";
    String keywords "bathymetry, centers, data, environmental, etopo, global, height, information, local, national, ncei, nesdis, noaa, source, topography";
    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 4.7.5 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Int32 nco_openmp_thread_number 1;
    Int32 node_offset 1;
    Float64 Northernmost_Northing 89.99583333333334;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.99583333333334;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "ETOPO 2022, a global relief model with 15 arc-second resolution seamlessly integrating topographic and bathymetric data. The ETOPO 2022 model uses a combination of numerous airborne lidar, satellite-derived topography, and shipborne bathymetry datasets from U.S. national and global sources. ETOPO 2022 uses bare-earth topographic data from NASAs ICESat-2 and other vetted data sources to independently validate both the input datasets and the final ETOPO 2022 model. ETOPO 2022 is available in \"Ice Surface\" (top of Antarctic and Greenland ice sheets) and \"Bedrock\" (base of the ice sheets) versions. ETOPO Global Topography and Bathymetry. NOAA National Centers for Environmental Information (NCEI) data from a local source.";
    String title "Bathymetry and Topography, NCEI ETOPO 2022, 30 Arc-Second, Global (Ice Surface)";
    Float64 Westernmost_Easting 0.004166666666662877;
  }
}

 

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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://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.

 

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