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Dataset Title:  IMS Snow and Ice Analysis, Arctic, 4km, 2004 - Present, Daily Subscribe RSS
Institution:  USNIC   (Dataset ID: usnic_ims_4km)
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 {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.0776672e+9, 1.6302816e+9;
    String axis "T";
    String comment "This is the 00Z reference time. Note that products are nowcasted to be valid specifically at the time given here.";
    String CoordinateAxisType "Time";
    String ioos_category "Time";
    String long_name "Centered Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  y {
    Float32 actual_range -1.2286e+7, 1.2286e+7;
    String axis "Y";
    String comment "y values are the centers of the grid cells";
    String ioos_category "Location";
    String long_name "y coordinate of projection";
    String standard_name "projection_y_coordinate";
    String units "m";
  }
  x {
    Float32 actual_range -1.2286e+7, 1.2286e+7;
    String axis "X";
    String comment "x values are the centers of the grid cells";
    String ioos_category "Location";
    String long_name "x coordinate of projection";
    String standard_name "projection_x_coordinate";
    String units "m";
  }
  IMS_Surface_Values {
    Byte _FillValue 0;
    String _Unsigned "false";
    String colorBarContinuous "false";
    Float64 colorBarMaximum 4.5;
    Float64 colorBarMinimum -0.5;
    String colorBarNSections "5";
    String comment "0: Outside Coverage Area, 1: Open Water, 2: Land Without Snow, 3: Sea Ice or Lake Ice, 4: Snow Covered Land";
    String flag_meanings "outside_coverage_area open_water snow_free_land lake_ice_or_sea_ice ice_and_snow_on_land";
    Byte flag_values 0, 1, 2, 3, 4;
    String ioos_category "Ice Distribution";
    String long_name "IMS maps of 0: no data, 1:open water, 2:land, 3:sea/lake ice, 4:snow cover for the Northern Hemisphere";
    String short_name "IMS Surface Values";
    String standard_name "area_type";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.6.2,hdf5=1.10.4";
    String acknowledgement "Produced at USNIC with support from NOAA NESDIS STAR.";
    String cdm_data_type "Grid";
    String comment "The IMS product has changed versions and resolutions over time. As of date_created, the product is available in three resolutions: 1 km, 4 km, and 24 km. Version 1 had a 24 km resolution from 04 Feb 1997 - 22 Feb 2004. Version 2 added a 4 km resolution to the product on 23 Feb 2004. Finally, Version 3 added a 1 km product on 02 Dec 2014. IMS products are also available through the creator_url and the publisher_url in additional formats such as ASCII, GeoTIFF, and GRIB2. Though the IMS is housed at the USNIC and originated with NOAA Center for Satellite Applications and Research (STAR), a number of additional organizations including NOAA's Ocean Prediction Center, Office of Satellite and Product Operations, Meteorological Development Laboratory, and NOAA@NSIDC contribute to IMS' current development, support, production, and archival. For more information, refer to https://nsidc.org/data/g02156. Note that the latitude and longitude for the NetCDF files are in separate NetCDF files also available from https://nsidc.org/data/g02156.";
    String contributor_name "U.S. National Ice Center, NOAA at NSIDC, NOAA PolarWatch, NOAA MDL, NOAA STAR";
    String contributor_role "Producer, Publisher, Advisor, Software Developer, Originator";
    String Conventions "CF-1.6, ACDD-1.3, COARDS";
    String creator_email "nic.ims.analysts@noaa.gov";
    String creator_institution "U.S. National Ice Center (USNIC)";
    String creator_name "U.S. National Ice Center (USNIC)";
    String creator_type "institution";
    String creator_url "https://usicecenter.gov/";
    String date_created "2021-05-04T20:17:32Z";
    String defaultGraphQuery "IMS_Surface_Values[(last)][(-4498000.0):(4500000.0)][(-4498000.0):(4500000.0)]&.draw=surface&.vars=x%7Cy%7CIMS_Surface_Values&.colorBar=%7C%7C%7C%7C%7C&.bgColor=0xffccccff";
    Float64 grid_mapping_false_easting 0.0;
    Float64 grid_mapping_false_northing 0.0;
    Float64 grid_mapping_latitude_of_projection_origin 90.0;
    String grid_mapping_name "polar_stereographic";
    String grid_mapping_proj4 "+proj=stere +lat_0=90 +lat_ts=60 +lon_0=-80 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6356257 +units=m +no_defs";
    Float64 grid_mapping_semi_major_axis 6378137.0;
    Float64 grid_mapping_semi_minor_axis 6356257.0;
    String grid_mapping_spatial_ref "PROJCS[\"unknown\",GEOGCS[\"unknown\",DATUM[\"unknown\",SPHEROID[\"unknown\",6378137,291.505347349177]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]]],PROJECTION[\"Polar_Stereographic\"],PARAMETER[\"latitude_of_origin\",60],PARAMETER[\"central_meridian\",-80],PARAMETER[\"false_easting\",0],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"Easting\",SOUTH],AXIS[\"Northing\",SOUTH]]";
    Float64 grid_mapping_standard_parallel 60.0;
    Float64 grid_mapping_straight_vertical_longitude_from_pole -80.0;
    String grid_mapping_units "m";
    String history 
"04 May 2021 20:17Z: NetCDF file generated from file NIC.IMS_v2_200421700_4km.asc
2021-12-09T06:24:20Z (local files)
2021-12-09T06:24:20Z https://polarwatch.noaa.gov/griddap/usnic_ims_4km.das";
    String id "G02156";
    String infoUrl "https://nsidc.org/data/G02156";
    String institution "USNIC";
    String instrument "See https://nsidc.org/data/g02156 for a list of instruments";
    String keywords "Earth Science > Cryosphere > Sea Ice > Ice Extent, Earth Science > Cryosphere > Snow/Ice > Snow Cover, environmental, extent, geographic, GEOGRAPHIC REGION > ARCTIC, GEOGRAPHIC REGION > NORTHERN HEMISPHERE, GEOGRAPHIC REGION > POLAR";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "These data may be redistributed and used without restriction.";
    String metadata_link "https://nsidc.org/data/G02156";
    String naming_authority "org.nsidc";
    String platform "Earth Observation Satellites, In Situ Land-based Platforms, In Situ Ocean-based Platforms, Ground Stations, Maps/Charts/Photographs, Models/Analyses";
    String platform_vocabulary "NASA Global Change Master Directory (GCMD) Keywords, Version 9.0";
    String processing_level "NOAA Level 4";
    String product_version "Version 2";
    String proj_crs_code "usnic_ims_nh";
    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, non-standard then this attribute references a PolarWatch assigned internal identifier.";
    String project "USNIC Snow and Ice Products";
    String publisher_email "nsidc@nsidc.org";
    String publisher_institution "National Snow and Ice Data Center";
    String publisher_name "National Snow and Ice Data Center";
    String publisher_type "institution";
    String publisher_url "https://nsidc.org/";
    String references "Ramsay, B. H. (1998). The interactive multisensor snow and ice mapping system. Hydrological Processes, 12(10-11), 1537-1546.; Helfrich, S. R., McNamara, D., Ramsay, B. H., Baldwin, T., & Kasheta, T. (2007). Enhancements to, and forthcoming developments in the Interactive Multisensor Snow and Ice Mapping System (IMS). Hydrological Processes: An International Journal, 21(12), 1576-1586. doi: https://doi.org/10.1002/hyp.6720.; Helfrich, S. R., M. Li, C. Kongoli, L. Nagdimunov, and E. Rodriguez. 2019. Interactive Multisensor Snow and Ice Mapping System Version 3 (IMS V3) - Algorithm Theoretical Basis Document Version 2.5. NOAA NESDIS Center for Satellite Applications and Research (STAR). 74 pp.;  U.S. National Ice Center. (2008, updated daily). IMS Daily Northern Hemisphere Snow and Ice Analysis at 1 km, 4 km, and 24 km Resolutions, Version 1. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: https://doi.org/10.7265/N52R3PMC.";
    String source "Analysts at the United States National Ice Center (USNIC) interactively create this product using a variety of data from many sources including in-situ, remote sensing, and modeled data sources. A description of the IMS system is available at: https://nsidc.org/data/g02156";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "This file contains a map of snow cover and ice cover for the Northern Hemisphere produced by the Interactive Multisensor Snow and Ice Mapping System (IMS). The map is valid at the time specified by the time_coverage_start and time_coverage_end global attributes. Analysts at the United States National Ice Center (USNIC) use a variety of geostationary and polar orbiting satellite imagery, derived products, in situ, and other data sources to interactively create the map. The system has produced daily analyses from February 1997 to Dec 2014, and twice daily analyses since.";
    String testOutOfDate "now-4days";
    String time_coverage_duration "P1D";
    String time_coverage_end "2021-08-30T00:00:00Z";
    String time_coverage_resolution "P1D";
    String time_coverage_start "2004-02-25T00:00:00Z";
    String title "IMS Snow and Ice Analysis, Arctic, 4km, 2004 - Present, Daily";
  }
}

 

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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