Data Access Form

Dataset Title:	HadISST Sea Ice Component, 1°, Global, Monthly, 1870-present
Institution:	Met Office Hadley Centre (Dataset ID: erdHadISSTIce)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	1853	30 days 10h 28m 15s (uneven)

latitude (degrees_north)	180	-1.0 (even)

longitude (degrees_east)	360	1.0 (even)

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

sic (Monthly 1 degree resolution sea ice concentration, 1)

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 -3.154334400864e+9, 1.7158608e+9;
    String axis "T";
    String calendar "gregorian";
    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";
    Float32 actual_range -89.5, 89.5;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.5, 179.5;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  sic {
    Float32 _FillValue -1.0e+30;
    String cell_methods "time: lat: lon: median";
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Ice Distribution";
    String long_name "Monthly 1 degree resolution sea ice concentration";
    Float32 missing_value -1.0e+30;
    String standard_name "sea_ice_area_fraction";
    String units "1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String comment "Data restrictions: for academic research use only. Data are Crown copyright see (http://www.opsi.gov.uk/advice/crown-copyright/copyright-guidance/index.htm)";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "john.kennedy@metoffice.gov.uk";
    String creator_name "Met Office Hadley Centre";
    String creator_type "institution";
    String creator_url "http://hadobs.metoffice.com/";
    String description "HadISST sea ice concentration.";
    Float64 Easternmost_Easting 179.5;
    Float64 geospatial_lat_max 89.5;
    Float64 geospatial_lat_min -89.5;
    Float64 geospatial_lat_resolution 1.0;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.5;
    Float64 geospatial_lon_min -179.5;
    Float64 geospatial_lon_resolution 1.0;
    String geospatial_lon_units "degrees_east";
    String history 
"2017-01 Roy Mendelssohn (erd.data@noaa.gov) downloaded HadISST_ice.nc.gz from http://hadobs.metoffice.com/hadisst/data/download.html
2024-11-23T07:57:39Z (local files)
2024-11-23T07:57:39Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdHadISSTIce.das";
    String infoUrl "http://hadobs.metoffice.com/";
    String institution "Met Office Hadley Centre";
    String keywords "area, centre, component, concentration, cryosphere, data, degree, distribution, Earth Science > Cryosphere > Sea Ice > Ice Extent, Earth Science > Oceans > Sea Ice > Ice Extent, extent, fraction, hadisst, hadley, ice, ice distribution, latitude, longitude, met, month, monthly, ocean, oceans, office, resolution, sea, sea_ice_area_fraction, sic, sst, surface, temperature, time, version";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"Data restrictions: for academic research use only. Data are Crown copyright see
        (http://www.opsi.gov.uk/advice/crown-copyright/copyright-guidance/index.htm)

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.";
    Float64 Northernmost_Northing 89.5;
    String references "Rayner, N. A., Parker, D. E., Horton, E. B., Folland, C. K., Alexander, L. V., Rowell, D. P., Kent, E. C., Kaplan, A.  Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late nineteenth century J. Geophys. Res.Vol. 108, No. D14, 4407 10.1029/2002JD002670";
    String source "HadISST";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.5;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary 
"The Met Office Hadley Centre's sea ice and sea surface temperature (SST) data set, HadISST1, replaces the Global sea Ice and Sea Surface Temperature (GISST) data sets, and is a unique combination of monthly globally-complete fields of SST and sea ice concentration on a 1 degree latitude-longitude grid from 1870 to date.        
        
WARNING: 10 March 2016: A detailed analysis of HadISST (https://ir.library.oregonstate.edu/xmlui/handle/1957/58385) has identified a number of problems, some of which might limit the utility of the dataset for certain scientific applications, particularly where high resolution SST data or spatial gradients of SST are required. Thanks to Dudley Chelton and Craig Risien for bringing this to our attention and their detailed analysis.

Data restrictions: for academic research use only.

Updates and supplementary information will be available from http://www.hadobs.org";
    String supplementary_information "Updates and supplementary information will be available from https://www.metoffice.gov.uk/hadobs/hadisst";
    String time_coverage_end "2024-05-16T12:00:00Z";
    String time_coverage_start "1870-01-16T11:59:59Z";
    String title "HadISST Sea Ice Component, 1°, Global, Monthly, 1870-present";
    Float64 Westernmost_Easting -179.5;
  }
}

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.