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Dataset Title:  Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Sea Ice Concentrations Subscribe RSS
Institution:  National Snow & Ice Data Center, Boulder, CO   (Dataset ID: NSIDC_SEA_ICE_CON)
Information:  Summary ? | License ? | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (ANSI date, UTC) ?      12493    1 day 3h 15m 10s (uneven)
  < slider >
 y (meters) ?      448    -25000.0 (even)
  < slider >
 x (meters) ?      304    25000.0 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 Sea_Ice_Concentration (percent) ?

File type: (more info)

(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 2.782332000000286e+8, 1.5038172000000286e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "ANSI date";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  y {
    String _CoordinateAxisType "GeoY";
    Float32 actual_range -5337500.0, 5837500.0;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Projection Grid Y Centers";
    String standard_name "projection_y_coordinate";
    String units "meters";
    Float32 valid_range -5350000.0, 5850000.0;
  }
  x {
    String _CoordinateAxisType "GeoX";
    Float32 actual_range -3837500.0, 3737500.0;
    String axis "X";
    String ioos_category "Location";
    String long_name "Projection Grid X Centers";
    String standard_name "projection_x_coordinate";
    String units "meters";
    Float32 valid_range -3850000.0, 3750000.0;
  }
  Sea_Ice_Concentration {
    Float32 _FillValue 255.0;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String datum "+ellps=WGS84";
    String grid_mapping "projection";
    String ioos_category "Ice Distribution";
    String long_name "Sea Ice Concentration";
    Float32 missing_value -9999.0;
    String units "percent";
  }
  NC_GLOBAL {
    String _CoordSysBuilder "ucar.nc2.dataset.conv.CF1Convention";
    String cdm_data_type "Grid";
    String comment "Not set at this time";
    String Conventions "CF-1.6, COARDS, Unidata Dataset Discovery v1.0";
    String creator_name "National Snow & Ice Data Center, Boulder, CO";
    String history 
"Each time slice was created with the following steps:
gdal_translate  -of netCDF -ot Int16 -a_srs +proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 +k=1 +x_0=0 +y_0=0 +a=6378273 +b=6356889.449 +units=m +no_defs -a_nodata 255 -A_ullr -3850000.0 5850000.0 3750000.0 -5350000.0 <input file> <output file>
Final output file appended to this netCDF file.
2018-04-21T09:46:30Z (local files)
2018-04-21T09:46:30Z http://erddap.axiomdatascience.com/erddap/griddap/NSIDC_SEA_ICE_CON.das";
    String infoUrl "???";
    String institution "National Snow & Ice Data Center, Boulder, CO";
    String keywords "boulder, center, concentration, concentrations, daily, data, distribution, dmsp, gridded, i-ssmis, ice, ice distribution, national, near, near real time, near-real-time, polar, real, sea, snow, ssm, ssmis, time";
    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 references "Documentation available at: https://nsidc.org/data/nsidc-0081.html";
    String source "See the title and references for this information";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF-12";
    String summary "Not set at this time";
    String time_coverage_end "2017-08-27T07:00:00Z";
    String time_coverage_start "1978-10-26T07:00:00Z";
    String title "Near-Real-Time DMSP SSM/I-SSMIS Daily Polar Gridded Sea Ice Concentrations";
  }
}

 

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.

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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