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Dataset Title:  Sea Ice Concentration Lat-Lon Grid, NOAA/NSIDC Climate Data Record, Northern
Hemisphere, 25km
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Institution:  NSIDC > National Snow and Ice Data Center, NOAA   (Dataset ID: nsidcCDRice_nh_grid)
Information:  Summary ? | License ? | Metadata | Background (external link) | Data Access Form | Files
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ygrid (meters) ?
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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 {
  ygrid {
    UInt32 _ChunkSizes 448;
    String _CoordinateAxisType "GeoY";
    Float32 actual_range -5337500.0, 5837500.0;
    String axis "Y";
    String comment " xgrid values are the centers of the grid cells";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Projection Y Coordinate";
    String standard_name "projection_y_coordinate";
    String units "meters";
    Float32 valid_range -5350000.0, 5850000.0;
  xgrid {
    UInt32 _ChunkSizes 304;
    String _CoordinateAxisType "GeoX";
    Float32 actual_range -3837500.0, 3737500.0;
    String axis "X";
    String comment " xgrid values are the centers of the grid cells";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Projection X Coordinate";
    String standard_name "projection_x_coordinate";
    String units "meters";
    Float32 valid_range -3850000.0, 3750000.0;
  longitude {
    Float64 _FillValue -999.0;
    String comment "These are longitude coordinate values which correspond to xgrid projected coordinate dimension values";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_range -180.0, 180.0;
  latitude {
    Float64 _FillValue -999.0;
    String comment "These are latitude coordinate values which correspond to ygrid projected coordinate dimension values";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_range 0.0, 90.0;
    String _NCProperties "version=1|netcdflibversion=|hdf5libversion=1.8.17";
    String acknowledgement "This project was supported in part by a grant from the NOAA Climate Data Record Program. Production of original NASA Team and Bootstrap algorithm estimates supported by the NASA Polar Distributed Active Archive Center. The sea ice concentration algorithms were developed by Donald J. Cavalieri, Josefino C. Comiso, Claire L. Parkinson, and others at the NASA Goddard Space Flight Center in Greenbelt, MD.";
    String cdm_data_type "Grid";
    String contributor_name "Walt Meier, Ruth Duerr, Florence Fetterer, Julienne Stroeve, Matt Savoie, Sean Mallory";
    String contributor_role "PrincipalInvestigator,author,author,author,author,author";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "";
    String creator_name "NSIDC";
    String creator_type "institution";
    String creator_url "";
    String date_created "2018-10-01T20:22:55Z";
    String defaultGraphQuery "latitude[(5837500.0):(-5337500.0)][(-3837500.0):(3737500.0)]&.draw=surface&.vars=xgrid%7Cygrid%7Clatitude&.colorBar=BlackWhite%7C%7C%7C%7C%7C&.bgColor=0xffccccff";
    String history 
"2017-07-03T15:07:45Z: Data file created using software: /n 2019-02-27T12:24:52: Additional metadata was added. Timestamp was converted to seconds since 1970-01-01T00:00:00Z.
    String id "G02202";
    String infoUrl "";
    String institution "NSIDC > National Snow and Ice Data Center, NOAA";
    String keywords "america, arctic, area, atlantic, barents, bay, beaufort, bering, bootstrap, canada, center, chukchi, climate, concentration, continent, CONTINENT > NORTH AMERICA > CANADA > HUDSON BAY, Continent > North America > Canada > Hudson Bay, cryosphere, data, davis, day, deviation, distribution, earth, Earth Science > Cryosphere > Sea Ice > Ice Extent, Earth Science > Cryosphere > Sea Ice > Sea Ice Concentration, Earth Science > Oceans > Sea Ice > Ice Extent, edited, estimated, extent, flag, flags, fraction, geographic, Geographic Region > Arctic, Geographic Region > Northern Hemisphere, Geographic Region > Polar, goddard, goddard_bt_seaice_conc_monthly, goddard_merged_seaice_conc_monthly, goddard_nt_seaice_conc_monthly, gulf, hemisphere, hudson, ice, ice distribution, lawrence, mayen, melt, microwave, nasa, national, noaa, noaa/nsidc, north, northern, norwegian, nsidc, ocean, Ocean > Arctic Ocean, Ocean > Arctic Ocean > Barents Sea, Ocean > Arctic Ocean > Beaufort Sea, Ocean > Arctic Ocean > Chukchi Sea, Ocean > Atlantic Ocean > North Atlantic Ocean > Davis Straight, OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF ST LAWRENCE, Ocean > Atlantic Ocean > North Atlantic Ocean > North Sea, Ocean > Atlantic Ocean > North Atlantic Ocean > Norwegian Sea, OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > SVALBARD AND JAN MAYEN, Ocean > Pacific Ocean, Ocean > Pacific Ocean > North Pacific Ocean > Bering Sea, Ocean > Pacific Ocean > North Pacific Ocean > Sea Of Okhotsk, oceans, okhotsk, pacific, passive, polar, sea, snow, straight, svalbard, xgrid, ygrid";
    String keywords_vocabulary "GCMD Science Keywords";
    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. Please acknowledge the use of these data with the following statement: \"These data were provided by NOAA's Center for Satellite Applications & Research (STAR) and the CoastWatch program and distributed by NOAA/NMFS/SWFSC/ERD. \" To reference these data as a citation in a paper, please follow the instructions in the license and at this link:";
    String Metadata_Link "";
    String naming_authority "";
    String platform "DMSP 5D-3/F17 > Defense Meteorological Satellite Program-F17";
    String processing_level "NOAA Level 3";
    String product_version "v03r01";
    String program "NOAA Climate Data Record Program";
    Float64 proj_false_easting 0.0;
    Float64 proj_false_northing 0.0;
    String proj_GeoTransform "-3850000.0 25000.0 0 5850000.0 0 25000.0";
    Float64 proj_grid_boundary_bottom_projected_y -5350000.0;
    Float64 proj_grid_boundary_left_projected_x -3850000.0;
    Float64 proj_grid_boundary_right_projected_x 3750000.0;
    Float64 proj_grid_boundary_top_projected_y 5850000.0;
    String proj_grid_mapping_name "polar_stereographic";
    Float64 proj_latitude_of_projection_origin 90.0;
    Float64 proj_longitude_of_projection_origin -45.0;
    Float64 proj_parent_grid_cell_column_subset_end 304.0;
    Float64 proj_parent_grid_cell_column_subset_start 0.0;
    Float64 proj_parent_grid_cell_row_subset_end 448.0;
    Float64 proj_parent_grid_cell_row_subset_start 0.0;
    String proj_proj4text "+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";
    Float64 proj_scaling_factor 1.0;
    Float64 proj_semimajor_radius 6378273.0;
    Float64 proj_semiminor_radius 6356889.449;
    String proj_spatial_ref "PROJCS[\"NSIDC Sea Ice Polar Stereographic North\",GEOGCS[\"Unspecified datum based upon the Hughes 1980 ellipsoid\",DATUM[\"Not_specified_based_on_Hughes_1980_ellipsoid\",SPHEROID[\"Hughes 1980\",6378273,298.279411123061,AUTHORITY[\"EPSG\",\"7058\"]],AUTHORITY[\"EPSG\",\"6054\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.01745329251994328,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4054\"]],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],PROJECTION[\"Polar_Stereographic\"],PARAMETER[\"latitude_of_origin\",70],PARAMETER[\"central_meridian\",-45],PARAMETER[\"scale_factor\",1],PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0],AUTHORITY[\"EPSG\",\"3411\"],AXIS[\"X\",UNKNOWN],AXIS[\"Y\",UNKNOWN]]";
    String proj_srid "urn:ogc:def:crs:EPSG::3411";
    Float64 proj_standard_parallel 70.0;
    Float64 proj_straight_vertical_longitude_from_pole 135.0;
    String proj_units "meters";
    String project "NOAA/NSIDC passive microwave sea ice concentration climate data record";
    String projection "EPSG:3411,";
    String publisher_email "";
    String publisher_name "NOAA NMFS SWFSC ERD";
    String publisher_type "institution";
    String publisher_url "";
    String references "Comiso, J. C., and F. Nishio. 2008. Trends in the Sea Ice Cover Using Enhanced and Compatible AMSR-E, SSM/I, and SMMR Data. Journal of Geophysical Research 113, C02S07, doi:10.1029/2007JC0043257. ; Comiso, J. C., D. Cavalieri, C. Parkinson, and P. Gloersen. 1997. Passive Microwave Algorithms for Sea Ice Concentrations: A Comparison of Two Techniques. Remote Sensing of the Environment 60(3):357-84. ; Comiso, J. C. 1984. Characteristics of Winter Sea Ice from Satellite Multispectral Microwave Observations. Journal of Geophysical Research 91(C1):975-94. ; Cavalieri, D. J., P. Gloersen, and W. J. Campbell. 1984. Determination of Sea Ice Parameters with the NIMBUS-7 SMMR. Journal of Geophysical Research 89(D4):5355-5369. ; Cavalieri, D. J., C. l. Parkinson, P. Gloersen, J. C. Comiso, and H. J. Zwally. 1999. Deriving Long-term Time Series of Sea Ice Cover from Satellite Passive-Microwave Multisensor Data Sets. Journal of Geophysical Research 104(7):\t15,803-15,814.";
    String sensor "SSMI/S > Special Sensor Microwave Imager/Sounder";
    String software_version_id "";
    String source " Satellite observations";
    String sourceUrl "";
    String spatial_resolution "25km";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "This ERDDAP data set provides the latitude - longitude grid for the Arctic (Northern Hemisphere) NSIDC passive microwave sea ice concentration climate data record (CDR) datasets distributed via the PolarWatch ERDDAP. The grid used for these datasets is the NSIDC polar stereographic grid with 25 x 25 km grid cells. The input netCDF files from NSIDC contain data variables and reference latitude and longitude variables. These are provided in this ERDDAP as separate datasets based on system architecture requirements.";
    String title "Sea Ice Concentration Lat-Lon Grid, NOAA/NSIDC Climate Data Record, Northern Hemisphere, 25km";


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{?query}
For example,[(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.

ERDDAP, Version 2.23
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