Data Access Form

Dataset Title:	Ice Concentration, NOAA-20 VIIRS, Near Real-Time, Polar Stereographic (South), Antarctic, 750m, Daily, Past 3 Weeks
Institution:	NOAA NESDIS CoastWatch (Dataset ID: noaacwVIIRSn20iceconcSP06Daily)
Information:	Summary \| License \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	887	1 day 6h 11m 52s (uneven)

altitude (m)	1	(just one value)

rows (m)	8640	-795.0 (even)

cols (m)	8640	795.0 (even)

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

IceConc (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 1.616518361276e+9, 1.712836945844e+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";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  rows {
    Float64 actual_range -3434002.5, 3434002.5;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Northing of Pixel Centers";
    String standard_name "projection_y_coordinate";
    String units "m";
  }
  cols {
    Float64 actual_range -3434002.5, 3434002.5;
    String axis "X";
    String ioos_category "Location";
    String long_name "Easting of Pixel Centers";
    String standard_name "projection_x_coordinate";
    String units "m";
  }
  IceConc {
    Float32 _FillValue -9.99;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    Int32 cw_fraction_digits 16;
    String ioos_category "Ice Distribution";
    String long_name "Ice Concentration";
    Float32 missing_value -9.99;
    String units "1";
    Float32 valid_max 1.0;
    Float32 valid_min 0.0;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "coastwatch.info@noaa.gov";
    String creator_name "NOAA/NESDIS/STAR/SOCD/CoastWatch";
    String creator_type "institution";
    String creator_url "https://coastwatch.noaa.gov";
    String crs_wkt "PROJCS[\"WGS 84 / NSIDC Sea Ice Polar Stereographic South\",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\"]],AUTHORITY[\"EPSG\",\"4326\"]],PROJECTION[\"Polar_Stereographic\"],PARAMETER[\"latitude_of_origin\",-70],PARAMETER[\"central_meridian\",0],PARAMETER[\"scale_factor\",1],PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"X\",EAST],AXIS[\"Y\",NORTH],AUTHORITY[\"EPSG\",\"3976\"]]";
    String cw_orbit_type "ascending/descending";
    String cw_pass_type "day/night";
    Float64 cw_polygon_latitude -47.197073938121655, -55.58931044424308, -59.044940950369885, -55.58931044424308, -47.197073938121655, -55.589310444243075, -59.044940950369885, -55.58931044424308, -47.197073938121655, -55.58931044424308, -59.044940950369885, -55.58931044424308, -47.197073938121655, -55.58931044424308, -59.044940950369885, -55.58931044424308, -47.197073938121655;
    Float64 cw_polygon_longitude -45.0, -26.56505117707799, 7.76948369878885e-15, 26.565051177077994, 45.00000000000001, 63.43494882292202, 90.0, 116.56505117707799, 135.0, 153.434948822922, -180.0, -153.434948822922, -135.0, -116.56505117707799, -90.0, -63.43494882292201, -45.0;
    String cw_projection "Polar Stereographic";
    String cw_sensor "VIIRS";
    String cw_software_name "JRR-IceConcentration";
    String cw_software_version "v2r3";
    String cw_viirs_band_naming_convention "IDPS";
    String date_created "2024-04-12T05:27:22Z";
    String defaultGraphQuery 
"IceConc%5B(time_coverage_end)%5D%5B(0.0)%5D%5B(3255922.5):(-3255922.5)%5D%5B(-3255922.5):(3255922.5)%5D%26.draw=surface%26.vars=cols%7Cro
ws%7CIceConc%26.colorBar=KT_ice%7C%7C%7C%7C%7C%26.bgColor=0xffccccff";
    Int32 end_orbit_number 33151;
    String geospatial_bounds "POLYGON((-45.0 -47.197074,-26.565051 -55.58931,0.0 -59.044941,26.565051 -55.58931,45.0 -47.197074,63.434949 -55.58931,90.0 -59.044941,116.565051 -55.58931,135.0 -47.197074,153.434949 -55.58931,-180.0 -59.044941,-153.434949 -55.58931,-135.0 -47.197074,-116.565051 -55.58931,-90.0 -59.044941,-63.434949 -55.58931,-45.0 -47.197074))";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"2024-04-18T21:33:43Z https://coastwatch.noaa.gov/erddap/griddap/noaacwVIIRSn20iceconcSP06Daily
2024-04-18T21:33:43Z https://polarwatch.noaa.gov/erddap/griddap/noaacwVIIRSn20iceconcSP06Daily.das";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://coastwatch.noaa.gov/cw/satellite-data-products/sea-ice/viirs-sea-ice-concentration-ice-thickness-ice-surface-temperature.html";
    String institution "NOAA NESDIS CoastWatch";
    String instrument "VIIRS";
    String keywords "altitude, coastwatch, cols, concentration, cryosphere, daily, data, day, distribution, earth, Earth Science > Cryosphere > Sea Ice > Sea Ice Concentration, Earth Science > Oceans > Sea Ice > Sea Ice Concentration, environmental, ice, ice distribution, IceConc, imager, imager/radiometer, imaging, information, infrared, national, near, near real time, nesdis, noaa, noaa-20, ocean, oceans, polar, radiometer, real, real time, real-time, realtime, rows, satellite, science, sea, service, south, stereographic, suite, time, viirs, visible";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"https://science.nasa.gov/earth-science/earth-science-data/data-information-policy/ 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 naming_authority "gov.noaa.coastwatch";
    String OBSERVED_PROPERTY "IceConc";
    String platform "NOAA-20";
    String proj4text "+proj=stere +lat_0=-90 +lat_ts=-70 +lon_0=0 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs";
    String proj_crs_code "EPSG:3976";
    String proj_crs_code_description "The proj_crs_code attribute references a registered projection identifier (i.e. EPSG) when available. If the projection is not registered or non-standardized then this attribute references a PolarWatch assigned internal identifier.";
    String source "NOAA-20_VIIRS_IceConc";
    String sourceUrl "https://coastwatch.noaa.gov/erddap/griddap/noaacwVIIRSn20iceconcSP06Daily";
    String srid "EPSG:3976";
    String standard_name_vocabulary "CF Standard Name Table v29";
    Int32 start_orbit_number 33137;
    String summary "Enterprise Ice Concentration/ Ice Mask/ Ice Surface Temperature Products";
    String testOutOfDate "now-2days";
    String time_coverage_end "2024-04-11T12:02:25Z";
    String time_coverage_start "2021-03-23T16:52:41Z";
    String title "Ice Concentration, NOAA-20 VIIRS, Near Real-Time, Polar Stereographic (South), Antarctic, 750m, Daily, Past 3 Weeks";
  }
}

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.