ERDDAP > griddap > Data Access Form

Dataset Title:	Global HYCOM Surface , 2D aggregation
Institution:	Naval Oceanographic Office via NOAA NCEI   (Dataset ID: Hycom_sfc_2d)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (UTC)				25632	3h 56m 4s (uneven)
latitude (degrees_north)				2001	0.08 (uneven)
longitude (degrees_east)				4500	0.08000001 (uneven)

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

surf_el (Water Surface Elevation, meter)

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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.3624416e+9, 1.7254836e+9;
    String axis "T";
    String calendar "proleptic_gregorian";
    String ioos_category "Time";
    String long_name "Forecast time for ForecastModelRunCollection";
    Float64 missing_value NaN;
    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 -80.0, 80.0;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    Int32 NAVO_code 1;
    String point_spacing "even";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 0.0, 359.9200439453125;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String modulo "360 degrees";
    Int32 NAVO_code 2;
    String standard_name "longitude";
    String units "degrees_east";
  }
  surf_el {
    String coordinates "time_run time lat lon";
    String ioos_category "Other";
    String long_name "Water Surface Elevation";
    Int32 NAVO_code 32;
    String units "meter";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.dataset.conv.CF1Convention";
    String analysis_tau "030 hours since analysis, analysis_time_origin = 2024-09-03 12:00:00";
    String cdm_data_type "Grid";
    String comment "...";
    String contact "FNMOC, CDO";
    String Conventions "Global NCOM";
    String creator_name "kelly.r.wood@navy.mil; jeffery.rayburn@navy.mil";
    String distribution_statement "Approved for public release; distribution unlimited.";
    Float64 Easternmost_Easting 359.9200439453125;
    String field_type "instantaneous";
    String generating_model "GOFS 3.1, Global HYCOM with OSU tides";
    Float64 geospatial_lat_max 80.0;
    Float64 geospatial_lat_min -80.0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.9200439453125;
    Float64 geospatial_lon_min 0.0;
    String geospatial_lon_units "degrees_east";
    String history 
"created on 20240904 ;
FMRC Best Dataset
2024-11-21T12:22:27Z https://www.ncei.noaa.gov/thredds-coastal/dodsC/hycom/hycom_sfc_agg/HYCOM_Surface_Aggregation_best.ncd
2024-11-21T12:22:27Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/Hycom_sfc_2d.das";
    String infoUrl "https://www.ncei.noaa.gov/thredds-coastal/catalog/hycom/hycom_sfc_agg/catalog.html?dataset=hycom/hycom_sfc_agg/HYCOM_Surface_Aggregation_best.ncd";
    String input_data_source "FNMOC NAVGEM, Satellite SSH, SST, in situ";
    String institution "Naval Oceanographic Office via NOAA NCEI";
    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 location "Proto fmrc:HYCOM_Surface_Aggregation";
    String message "UNCLASSIFIED";
    String model_type "x-curvilinear lon, y-curvilinear lat, hybrid z";
    Float64 Northernmost_Northing 80.0;
    String operational_status "operational";
    String publisher_name "OceanNOMADS@noaa.gov";
    String reference "https://portal.fnmoc.navy.mil/";
    String source "HYCOM archive file; GOFS 3.1 GLBy0.08 expt_93.0";
    String sourceUrl "https://www.ncei.noaa.gov/thredds-coastal/dodsC/hycom/hycom_sfc_agg/HYCOM_Surface_Aggregation_best.ncd";
    Float64 Southernmost_Northing -80.0;
    String standard_name_vocabulary "CF-1.0";
    String summary "Globale HYCOM Surface, 2-dimensional time series fields from the best time series aggregation.";
    String time_coverage_end "2024-09-04T21:00:00Z";
    String time_coverage_start "2013-03-05T00:00:00Z";
    String time_origin "2024-09-04 00:00:00";
    String title "Global HYCOM Surface , 2D aggregation";
    Float64 Westernmost_Easting 0.0;
  }
}

 

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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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