ERDDAP > griddap > Data Access Form

Dataset Title:	Regional NCOM Alaska 2D (Apr 12, 2015 to Dec 16, 2020)
Institution:	Naval Oceanographic Office via NOAA NCEI   (Dataset ID: NCOM_alaska_20150412_to_20201216_2d)
Information:	Summary | License | Metadata | Background | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (UTC)				15864	3h 8m 44s (uneven)
latitude (degrees_north)				769	0.03333 (even)
longitude (degrees_east)				1504	0.03333 (even)

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

surf_el (Water Surface Elevation, meter)

surf_atm_press (Surface Atmospherics Pressure, Pascal)

surf_temp_flux (model surface temperature flux, degC-m/s)

surf_salt_flux (model surface salinity flux, psu-m/s)

surf_solar_flux (model surface shortwave flux, degC-m/s)

surf_roughness (model surface roughness, m)

surf_wnd_stress_gridx (newton/meter2)

surf_wnd_stress_gridy (newton/meter2)

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). .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 1.4287968e+9, 1.6084224e+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 36.45000076293945, 62.04743957519531;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    Int32 NAVO_code 1;
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_range 36.45000076293945, 62.04743957519531;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range 190.0, 240.09498596191406;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    Int32 NAVO_code 2;
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_range 190.0, 240.09498596191406;
  }
  surf_el {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    String coordinates "time_run time lat lon";
    String ioos_category "Sea Level";
    String long_name "Water Surface Elevation";
    Int32 NAVO_code 32;
    String positive "up";
    String units "meter";
  }
  surf_atm_press {
    String _CoordinateAxisType "Pressure";
    String coordinates "time_run time lat lon";
    String ioos_category "Pressure";
    String long_name "Surface Atmospherics Pressure";
    Int32 NAVO_code 62;
    String units "Pascal";
  }
  surf_temp_flux {
    String coordinates "time_run time lat lon";
    String ioos_category "Heat Flux";
    String long_name "model surface temperature flux";
    Int32 NAVO_code 99;
    String units "degC-m/s";
  }
  surf_salt_flux {
    String coordinates "time_run time lat lon";
    String ioos_category "Salinity";
    String long_name "model surface salinity flux";
    Int32 NAVO_code 99;
    String units "psu-m/s";
  }
  surf_solar_flux {
    String coordinates "time_run time lat lon";
    String ioos_category "Heat Flux";
    String long_name "model surface shortwave flux";
    Int32 NAVO_code 99;
    String units "degC-m/s";
  }
  surf_roughness {
    String coordinates "time_run time lat lon";
    String ioos_category "Surface Waves";
    String long_name "model surface roughness";
    Int32 NAVO_code 99;
    String units "m";
  }
  surf_wnd_stress_gridx {
    String coordinates "time_run time lat lon";
    String ioos_category "Wind";
    String long_name "Grid x Surface Wind Stress";
    Int32 NAVO_code 60;
    String units "newton/meter2";
  }
  surf_wnd_stress_gridy {
    String coordinates "time_run time lat lon";
    String ioos_category "Wind";
    String long_name "Grid y Surface Wind Stress";
    Int32 NAVO_code 61;
    String units "newton/meter2";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.dataset.conv.CF1Convention";
    String cdm_data_type "Grid";
    String classification_authority "not applicable";
    String classified_by "not applicable";
    String contact "FNMOC, N5";
    String Conventions "Global NCOM";
    String creator_name "kelly.r.wood@navy.mil; jeffery.rayburn@navy.mil";
    String derived_from "not applicable";
    String distribution_statement "Approved for public release; distribution is unlimited.";
    String downgrade_date "not applicable";
    Float64 Easternmost_Easting 240.09498596191406;
    String generating_model "NCOM_4.3";
    Float64 geospatial_lat_max 62.04743957519531;
    Float64 geospatial_lat_min 36.45000076293945;
    Float64 geospatial_lat_resolution 0.03332999845345815;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 240.09498596191406;
    Float64 geospatial_lon_min 190.0;
    Float64 geospatial_lon_resolution 0.033329997313316075;
    String geospatial_lon_units "degrees_east";
    String history 
"not applicable ;
FMRC Best Dataset
2024-04-19T07:06:39Z https://www.ncei.noaa.gov/thredds-coastal/dodsC/ncom_alaska_agg_20150412_20201216/Alaska_Apr_12_2015_to_Dec_16_2020_best.ncd
2024-04-19T07:06:39Z https://www.ncei.noaa.gov/erddap/griddap/NCOM_alaska_20150412_to_20201216_2d.das";
    String infoUrl "https://www.ncei.noaa.gov/thredds-coastal/catalog/ncom_alaska_agg_20150412_20201216/catalog.html?dataset=ncom_alaska_agg_20150412_20201216/Alaska_Apr_12_2015_to_Dec_16_2020_best.ncd";
    String initial_time "2000010100";
    String input_data_source "not_applicable";
    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:Alaska_Apr_12_2015_to_Dec_16_2020";
    Float64 Northernmost_Northing 62.04743957519531;
    String operational_status "operational";
    String publisher_name "OceanNOMADS@noaa.gov";
    String releasable_to "not applicable";
    String sourceUrl "https://www.ncei.noaa.gov/thredds-coastal/dodsC/ncom_alaska_agg_20150412_20201216/Alaska_Apr_12_2015_to_Dec_16_2020_best.ncd";
    Float64 Southernmost_Northing 36.45000076293945;
    String standard_name_vocabulary "CF-1.0";
    String summary "3-day forecast for NCOM Alaska from April 12, 2015 to December 16, 2020, 2D";
    String time_coverage_end "2020-12-20T00:00:00Z";
    String time_coverage_start "2015-04-12T00:00:00Z";
    String time_origin "2020-12-15 00:00:00";
    String title "Regional NCOM Alaska 2D (Apr 12, 2015 to Dec 16, 2020)";
    Float64 Westernmost_Easting 190.0;
  }
}

 

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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/erdBAssta5day.htmlTable?sst[(2007-10-21T00:00:00)][0][(-75):100:(75)][(180):100:(360)]
Thus, the query is often a data variable name (e.g., sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][altitude][latitude][longitude]).

For details, see the griddap Documentation.

 

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