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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

<ul>
<li>Updated metadata field values for PGEVERSION (collection level remains Version 4)</li>
<li> Removed 15% sea ice concentration threshold that assigned pixels
with a sea ice concentration of <15% as ocean (data value of 255)</li>
<li>Reprocessed NISE Version 4 to include sea ice concentration values of 1-14%</li>
</ul>
<p>This revision is an update to NISE Version 4. All Version 4 data (17 August 2009 - present) have been reprocessed with this system. </p>

Product Summary

Platforms
DMSP 5D-3/F17
Instruments
SSMIS
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Spatial Resolution
25 Kilometers x 25 Kilometers
Geographic Region
ANTARCTICA ,
ARCTIC ,
NORTHERN HEMISPHERE ,
SOUTHERN HEMISPHERE
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2009-08-17 to Present
Concept ID
C3177837525-NSIDC_CPRD
Data State
ACTIVE
Number of Files/Granules
5883
Processing Level
3
Published
Science Keywords
Sea Ice Concentration ,
Snow Cover

Citation

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.

Copy Citation

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: 2026-01-08

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