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Description
The Near-real-time Ice and Snow Extent (NISE) data set provides daily, global maps of sea ice concentrations and snow extent. These data are not suitable for time series, anomalies, or trends analyses. They are meant to provide a best estimate of current ice and snow conditions based on information and algorithms available at the time the data are acquired. Near-real-time products are not intended for operational use in assessing sea ice conditions for navigation.
This NISE Version 4 product contains DMSP-F17, SSMIS-derived sea ice concentrations and snow extents derived from the Special Sensor Microwave Imager/Sounder (SSMIS) aboard the Defense Meteorological Satellite Program (DMSP) F17 satellite. For DMSP-F16, SSMIS-derived data, see <a href="https://doi.org/10.5067/JAQDJKPX0S60"> NISE Version 3</a>. For DMSP-F18, SSMIS-derived data, see <a href="https://dx.doi.org/10.5067/3KB2JPLFPK3R">NISE Version 5</a>. For the older, DMSP-F13, Special Sensor Microwave Imager (SSMI) derived data, see <a href="https://doi.org/10.5067/4FSODMDM1WEJ">NISE Version 2</a>.
Version Description
Updated metadata field values for PGEVERSION (collection level remains Version 4)
Removed 15% sea ice concentration threshold that assigned pixels
with a sea ice concentration of <15% as ocean (data value of 255)
Reprocessed NISE Version 4 to include sea ice concentration values of 1-14%
This revision is an update to NISE Version 4. All Version 4 data (17 August 2009 - present) have been reprocessed with this system.
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Nolin, A., Armstrong, R., & Maslanik, J. (1998). Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent, Version 4 [Data set]. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/VF7QO90IHZ99 Date Accessed: 2026-05-01
Nolin, Anne, Richard Armstrong, and Jim Maslanik. “Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent, Version 4.” NASA National Snow and Ice Data Center Distributed Active Archive Center, 1998. doi:10.5067/VF7QO90IHZ99. Date Accessed: 2026-05-01
Nolin, Anne, et al. Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent, Version 4. NASA National Snow and Ice Data Center Distributed Active Archive Center, 1998, doi:10.5067/VF7QO90IHZ99. Date Accessed: 2026-05-01
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