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Dataset Title:  Latitude and Longitude Grids Corresponding to Y-Grids and X-Grids in EASE-2
Projection Used in NESDIS Sea Ice Data Products, Arctic, 1km, UW-CIMSS
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Institution:  Cooperative Institute for Meteorological Studies, University of Wisconsin at Madison   (Dataset ID: nesdis_ease2_latlon_nhem_1k)
Information:  Summary ? | License ? | Metadata | Background (external link) | Data Access Form | Files
 
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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 {
  rows {
    UInt32 _ChunkSizes 9024;
    String _CoordinateAxisType "GeoY";
    Int32 actual_range -4512000, 4511000;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Northing of Pixel Centers";
    String standard_name "projection_y_coordinate";
    String units "meters";
  }
  cols {
    UInt32 _ChunkSizes 9024;
    String _CoordinateAxisType "GeoX";
    Int32 actual_range -4512000, 4511000;
    String axis "X";
    String ioos_category "Location";
    String long_name "Easting of Pixel Centers";
    String standard_name "projection_x_coordinate";
    String units "meters";
  }
  longitude {
    String comment "longitude of EASE2 Grid 1km resolution in the polar regions, Arctic (9024,9024)";
    String coverage_content_type "coordinate";
    String grid_mapping "crs";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  latitude {
    String comment "latitude of EASE2 Grid 1km resolution in the polar regions, Arctic (9024, 9024)";
    String coverage_content_type "coordinate";
    String grid_mapping "crs";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.8.1,hdf5=1.10.7";
    String cdm_data_type "Grid";
    String cdr_program "NOAA National Environmental Satellite, Data and Information Service";
    String cdr_variable "latitude and longitude grids";
    String Conventions "CF-1.6, ACDD-1.3, NOAA CDR v1.0, GDS v2.0, COARDS";
    String creator_email "rdworak@ssec.wisc.edu";
    String creator_name "Richard J. Dworak";
    String creator_type "institution";
    String creator_url "stratus.ssec.wisc.edu";
    String date_created "2024-04-04";
    String defaultGraphQuery "latitude[(last)]&.draw=surface";
    String grid_mapping_comment "1 km EASE2-Grid. Refer to https://nsidc.org/data/user-resources/help-center/guide-ease-grids";
    String grid_mapping_earth_radius "6378137.0f";
    String grid_mapping_epsg_code "6931";
    String grid_mapping_false_easting "0.0f";
    String grid_mapping_false_northing "0.0f";
    String grid_mapping_latitude_of_projection_origin "90.0f";
    String grid_mapping_longitude_of_projection_origin "0.0f";
    String grid_mapping_name "lambert_azimuthal_equal_area";
    String grid_mapping_proj4 "+proj=laea +lat_0=90 +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs +type=crs";
    String history 
"2024-07-24T07:22:39Z (local files)
2024-07-24T07:22:39Z https://polarwatch.noaa.gov/griddap/nesdis_ease2_latlon_nhem_1k.das";
    String infoUrl "https://www.mdpi.com/2072-4292/13/15/2982";
    String institution "Cooperative Institute for Meteorological Studies, University of Wisconsin at Madison";
    String keywords "EARTH SCIENCE, Earth Science > Cryosphere > Sea Ice > Sea Ice Concentration, Geographic Region > Polar, Northern Hemisphere, xgrid, ygrid";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "These data may be redistributed and used without restriction.";
    String metadata_link "https://www.star.nesdis.noaa.gov/jpss/documents/ATBD/ATBD_EPS_Cloud_Mask_v1.2.pdf";
    String nameing_authority "ssec.wisc.edu";
    String platform "NOAA21 and GCOM-W1";
    String processing_level "L3 Mapped";
    String product_version "v1.0";
    String proj_crs_code "EPSG:6931";
    String references "https://nsidc.org/data/user-resources/help-center/guide-ease-grids";
    String sourceUrl "(local files)";
    String spatial_resolution "1 km";
    String standard_name_vocabulary "CF Standard Name Table v36";
    String summary "This dataset includes latitude and longitude grids that correspond to the Y-grid and X-grid used in the NESDIS sea ice products in the Arctic. Presented in the EASE-2 (Equal-Area Scalable Earth-2) projection at a 1km resolution, this dataset serves as ancillary data to the sea ice data products in the same projection.";
    String time_coverage_duration "P1D";
    String time_coverage_resolution "P1D";
    String title "Latitude and Longitude Grids Corresponding to Y-Grids and X-Grids in EASE-2 Projection Used in NESDIS Sea Ice Data Products, Arctic, 1km, UW-CIMSS";
  }
}

 

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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