Data Set ID:

Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations, Version 1

This data set provides a Near-Real-Time (NRT) map of sea ice concentrations for both the Northern and Southern Hemispheres.

This is the most recent version of these data.

Version Summary:
  • June 2016

    Starting on 1 April 2016, sea ice concentration fields are computed using F18 data.
  • March 2015

    New smaller pole hole mask used: SSMIS Pole Hole

    New spurious ice masks: NIC Valid Ice Masks
  • 1999

    Initial release of this data product.

COMPREHENSIVE Level of Service

Data: Data integrity and usability verified; data customization services available for select data

Documentation: Key metadata and comprehensive user guide available

User Support: Assistance with data access and usage; guidance on use of data in tools and data customization services

See All Level of Service Details

Data Format(s):
  • PNG
  • Binary
Spatial Coverage:
N: 90, 
N: -39.23, 
S: 30.98, 
S: -90, 
E: 180, 
E: 180, 
W: -180
W: -180
Platform(s):DMSP 5D-3/F17, DMSP 5D-3/F18
Spatial Resolution:
  • 25 km x 25 km
Temporal Coverage:
  • 1 January 2015
Temporal Resolution1 dayMetadata XML:View Metadata Record
Data Contributor(s):Jim Maslanik, Julienne Stroeve, Kenneth Knowles, Walter Meier, Donald Cavalieri

Geographic Coverage

Other Access Options

Other Access Options


As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Maslanik, J. and J. Stroeve. 1999. Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations, Version 1. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: [Date Accessed].

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How To

How do I import sea ice data binary data files into ArcGIS?
The following are instructions describing how to import sea ice binary files into ArcGIS. These instructions were tested with ArcMap 10.5 and 10.6. 1. Rename the Data File. In order to be able to import a Polar Stereographic sea ice concentration file into ArcGIS, you will need to: Rename the... read more
Subsetting and Reformatting with the NSIDC PyRS Tool
The NSIDC Python Reformatting and Subsetting (PyRS) tool is a command line tool which prompts the user to specify data reformatting and subsetting preferences. Output formats available are native, GeoTIFF, and NetCDF. If the dataset is polar stereographic, subsetting can be performed in the... read more
Subsetting and Reformatting with the NSIDC PyRS Docker Container
The NSIDC Python Reformatting and Subsetting (PyRS) tool is a user prompt command line tool for data reformatting and subsetting. PyRS is designed to work with select datasets in binary format: Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-... read more
Filter and order from a data set web page
Many NSIDC data set web pages provide the ability to search and filter data with spatial and temporal contstraints using a map-based interface. This article outlines how to order NSIDC DAAC data using advanced searching and filtering.  Step 1: Go to a data set web page This article will use the... read more


Descriptions of and Differences between the NASA Team and Bootstrap Algorithms
NSIDC currently archives passive microwave sea ice concentration products based on two algorithms: the NASA Team algorithm and the Bootstrap algorithm. Both algorithms were developed by researchers at the NASA Goddard Space Flight Center in the 1980s. Provided below are two short summaries of the... read more