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Dataset Title:  Ice Surface Temperature, NOAA-20 VIIRS, Near Real-Time, Polar
Stereographic (South), Antarctic, 750m, 4-day Composite, Past 3 Weeks
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Institution:  NOAA NESDIS CoastWatch   (Dataset ID: noaacwVIIRSn20icesrftempSP06Daily4Day)
Information:  Summary ? | License ? | Metadata | Background (external link) | Data Access Form
 
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X Axis:  ?
Y Axis:  ?
Color:  ?
 
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time (UTC) ?     specify just 1 value →
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altitude (m) ?     specify just 1 value →
   
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rows (m) ?
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    - + >|
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cols (m) ?
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   Minimum:   Maximum:   N Sections: 
Y Axis Minimum:   Maximum:   
 
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    [The graph you specified. Please be patient.]

 

Things You Can Do With Your Graphs

Well, you can do anything you want with your graphs, of course. But some things you might not have considered are:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.618272e+9, 1.6384032e+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";
  }
  IceSrfTemp {
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum 290.0;
    Float64 colorBarMinimum 240.0;
    Int32 cw_fraction_digits 16;
    String ioos_category "Temperature";
    String long_name "Ice Surface Temp";
    Float32 missing_value -999.0;
    String units "Kelvin(K)";
  }
  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_satellite "NOAA-20";
    String cw_sensor "VIIRS";
    String cw_software_name "JRR-IceConcentration";
    String cw_software_version "v2r3";
    Int32 cw_swath_sync_lines 2147483647;
    String cw_viirs_band_naming_convention "IDPS";
    String date_created "2021-12-07T06:06:45Z";
    String defaultGraphQuery "IceSrfTemp%5Blatest%5D%5B(0.0)%5D%5B(3255922.5000014827):(-3255922.500001482)%5D%5B(-3255922.5000014827):(3255922.500001483)%5D&.draw=surface&.vars=cols%7Crows%7CIceSrfTemp&.colorBar=KT_thermal%7C%7CLinear%7C%7C%7C&.bgColor=0xffccccff";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"JRR Ice Concentration v2r0
2021-12-09T06:56:11Z (local files)
2021-12-09T06:56:11Z https://coastwatch.noaa.gov/erddap/griddap/noaacwVIIRSn20icesrftempSP06Daily4Day.das
2021-12-09T07:27:01Z https://coastwatch.noaa.gov/erddap/griddap/noaacwVIIRSn20icesrftempSP06Daily4Day
2021-12-09T07:27:01Z https://polarwatch.noaa.gov/griddap/noaacwVIIRSn20icesrftempSP06Daily4Day.das";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://coastwatch.noaa.gov";
    String institution "NOAA NESDIS CoastWatch";
    String instrument "VIIRS";
    String keywords "4-day, altitude, coastwatch, cols, composite, cryosphere, daily, data, day, earth, Earth Science > Cryosphere > Sea Ice > Ice Temperature, environmental, ice, IceSrfTemp, imager, imager/radiometer, imaging, information, infrared, national, near, near real time, nesdis, noaa, noaa-20, polar, radiometer, real, real time, real-time, realtime, rows, satellite, science, sea, service, south, stereographic, suite, surface, temperature, 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 "IceSrfTemp";
    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 source "NOAA-20_VIIRS_IceSrfTemp";
    String sourceUrl "https://coastwatch.noaa.gov/erddap/griddap/noaacwVIIRSn20icesrftempSP06Daily4Day";
    String srid "EPSG:3976";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "Enterprise Ice Concentration/ Ice Mask/ Ice Surface Temperature Products";
    String testOutOfDate "now-2days";
    String time_coverage_end "2021-12-02T00:00:00Z";
    String time_coverage_start "2021-04-13T00:00:00Z";
    String title "Ice Surface Temperature, NOAA-20 VIIRS, Near Real-Time, Polar Stereographic (South), Antarctic, 750m, 4-day Composite, 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.

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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