Make A Graph

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
Institution:	Cooperative Institute for Meteorological Studies, University of Wisconsin at Madison (Dataset ID: nesdis_ease2_latlon_nhem_1k)
Information:	Summary \| License \| Metadata \| Background \| Data Access Form \| Files

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Graph Type:
X Axis:
Y Axis:
Color:

Dimensions

Start

Stop

rows (meters)

cols (meters)

Graph Settings
Color Bar:	Continuity:	Scale:
Minimum:	Maximum:	N Sections:
Y Axis Minimum:	Maximum:

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Optional:
Then set the File Type: (File Type information)
and

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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:

Web page authors can embed a graph of the latest data in a web page using HTML <img> tags.
Anyone can use ERDDAPs Slide Sorter to build a personal web page that displays graphs with the latest data (or other images or HTML content), each in its own, draggable slide.

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 
"2024-04-30T15:36:47Z (local files)
2024-04-30T15:36:47Z 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.

(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.