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ERDDAP > info > usnic_ims_4km

Title Sum-
Institution Dataset ID
 data       graph     files  IMS Snow and Ice Analysis, Arctic, 4km, 2004 - Present, Daily    ?            M   background (external link) RSS Subscribe USNIC usnic_ims_4km

The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL _NCProperties String version=2,netcdf=4.6.2,hdf5=1.10.4
attribute NC_GLOBAL acknowledgement String Produced at USNIC with support from NOAA NESDIS STAR.
attribute NC_GLOBAL cdm_data_type String Grid
attribute NC_GLOBAL comment String 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 Note that the latitude and longitude for the NetCDF files are in separate NetCDF files also available from
attribute NC_GLOBAL contributor_name String U.S. National Ice Center, NOAA at NSIDC, NOAA PolarWatch, NOAA MDL, NOAA STAR
attribute NC_GLOBAL contributor_role String Producer, Publisher, Advisor, Software Developer, Originator
attribute NC_GLOBAL Conventions String CF-1.6, ACDD-1.3, COARDS
attribute NC_GLOBAL creator_email String nic.ims.analysts at
attribute NC_GLOBAL creator_institution String U.S. National Ice Center (USNIC)
attribute NC_GLOBAL creator_name String U.S. National Ice Center (USNIC)
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String (external link)
attribute NC_GLOBAL date_created String 2024-04-10T00:33:12Z
attribute NC_GLOBAL defaultGraphQuery String 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
attribute NC_GLOBAL grid_mapping_false_easting double 0.0
attribute NC_GLOBAL grid_mapping_false_northing double 0.0
attribute NC_GLOBAL grid_mapping_latitude_of_projection_origin double 90.0
attribute NC_GLOBAL grid_mapping_name String polar_stereographic
attribute NC_GLOBAL grid_mapping_proj4 String +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
attribute NC_GLOBAL grid_mapping_semi_major_axis double 6378137.0
attribute NC_GLOBAL grid_mapping_semi_minor_axis double 6356257.0
attribute NC_GLOBAL grid_mapping_spatial_ref String 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]]
attribute NC_GLOBAL grid_mapping_standard_parallel double 60.0
attribute NC_GLOBAL grid_mapping_straight_vertical_longitude_from_pole double -80.0
attribute NC_GLOBAL grid_mapping_units String m
attribute NC_GLOBAL history String 10 April 2024 00:33Z: NetCDF file generated from file NIC.IMS_v3_202410100_4km.asc
attribute NC_GLOBAL id String G02156
attribute NC_GLOBAL infoUrl String (external link)
attribute NC_GLOBAL institution String USNIC
attribute NC_GLOBAL instrument String See for a list of instruments
attribute NC_GLOBAL keywords String 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
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String These data may be redistributed and used without restriction.
attribute NC_GLOBAL metadata_link String (external link)
attribute NC_GLOBAL naming_authority String org.nsidc
attribute NC_GLOBAL platform String Earth Observation Satellites, In Situ Land-based Platforms, In Situ Ocean-based Platforms, Ground Stations, Maps/Charts/Photographs, Models/Analyses
attribute NC_GLOBAL platform_vocabulary String NASA Global Change Master Directory (GCMD) Keywords, Version 9.0
attribute NC_GLOBAL processing_level String NOAA Level 4
attribute NC_GLOBAL product_version String Version 3
attribute NC_GLOBAL proj_crs_code String usnic_ims_nh
attribute NC_GLOBAL proj_crs_code_description String 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.
attribute NC_GLOBAL project String USNIC Snow and Ice Products
attribute NC_GLOBAL publisher_email String nsidc at
attribute NC_GLOBAL publisher_institution String National Snow and Ice Data Center
attribute NC_GLOBAL publisher_name String National Snow and Ice Data Center
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL publisher_url String (external link)
attribute NC_GLOBAL references String 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:; 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:
attribute NC_GLOBAL source String 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:
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v70
attribute NC_GLOBAL summary String 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 nowcasted to be valid at the moment specified by the time variable. The input data used to generate the map originates between 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.
attribute NC_GLOBAL testOutOfDate String now-4days
attribute NC_GLOBAL time_coverage_duration String P1D
attribute NC_GLOBAL time_coverage_end String 2024-05-22T00:00:00Z
attribute NC_GLOBAL time_coverage_resolution String P1D
attribute NC_GLOBAL time_coverage_start String 2004-02-25T00:00:00Z
attribute NC_GLOBAL title String IMS Snow and Ice Analysis, Arctic, 4km, 2004 - Present, Daily
dimension time   double nValues=7268, evenlySpaced=false, averageSpacing=1 day 0h 24m 46s
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.0776672E9, 1.716336E9
attribute time axis String T
attribute time comment String This is the 00Z reference time. Note that products are nowcasted to be valid specifically at the time given here.
attribute time CoordinateAxisType String Time
attribute time ioos_category String Time
attribute time long_name String Centered Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
dimension y   float nValues=6144, evenlySpaced=true, averageSpacing=4000.0
attribute y actual_range float -1.2286E7, 1.2286E7
attribute y axis String Y
attribute y comment String y values are the centers of the grid cells
attribute y ioos_category String Location
attribute y long_name String y coordinate of projection
attribute y standard_name String projection_y_coordinate
attribute y units String m
dimension x   float nValues=6144, evenlySpaced=true, averageSpacing=4000.0
attribute x actual_range float -1.2286E7, 1.2286E7
attribute x axis String X
attribute x comment String x values are the centers of the grid cells
attribute x ioos_category String Location
attribute x long_name String x coordinate of projection
attribute x standard_name String projection_x_coordinate
attribute x units String m
variable IMS_Surface_Values   byte time, y, x
attribute IMS_Surface_Values _FillValue byte 0
attribute IMS_Surface_Values colorBarContinuous String false
attribute IMS_Surface_Values colorBarMaximum double 4.5
attribute IMS_Surface_Values colorBarMinimum double -0.5
attribute IMS_Surface_Values colorBarNSections String 5
attribute IMS_Surface_Values comment String 0: Outside Coverage Area, 1: Open Water, 2: Land Without Snow, 3: Sea Ice or Lake Ice, 4: Snow Covered Land
attribute IMS_Surface_Values flag_meanings String outside_coverage_area open_water snow_free_land lake_ice_or_sea_ice ice_and_snow_on_land
attribute IMS_Surface_Values flag_values byte 0, 1, 2, 3, 4
attribute IMS_Surface_Values ioos_category String Ice Distribution
attribute IMS_Surface_Values long_name String IMS maps of 0: no data, 1:open water, 2:land, 3:sea/lake ice, 4:snow cover for the Northern Hemisphere
attribute IMS_Surface_Values short_name String IMS Surface Values
attribute IMS_Surface_Values standard_name String area_type

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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