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NSIDC archives and distributes daily and monthly data derived from the Special Sensor Microwave/Imager (SSM/I), as well as daily and monthly data products derived from its predecessor, the Scanning Multichannel Microwave Radiometer (SMMR). Together, these two passive microwave sensors offer an extensive data record which spans from 1978 through the present. In addition, the data products derived from these sensors are offered in two flexible and easy-to-use projections: EASE-Grid and Polar Stereographic.
The Equal-Area Scalable Earth Grid (EASE-Grid) projection is mainly intended for users of global-scale gridded data who wish to view their data in maps with the least amount of shape and areal distortion. EASE-Grid data products are offered in three different equal-area projections: northern and southern azimuthal, and global cylindrical. For more information, refer to the EASE-Grid Data Web site.
The NSIDC polar stereographic projection specifies a projection plane or grid tangent to the surface of the Earth at 70 degrees northern and southern latitude. While this increases the distortion at the poles by six percent, the latitude of 70 degrees was selected so that little or no distortion would occur in the marginal ice zone. For more information, visit the Polar Stereographic Data Web site.
For a list of available SMMR and SSM/I data products, refer to the Data Summaries page listed in the navigation on the left side of this page. From the Data Summaries Web page, select either EASE-Grid Data Summaries or Polar Stereographic Data Summaries to view the respective Web pages and access data.
See Also
Provides a description of the SSM/I sensor and its purpose.
Provides a description of the SMMR sensor and its purpose.
NOAA/NASA Pathfinder Program at NSIDC
A jointly-sponsored program designed to provide scientists with a time series of global-scale remote sensing data for the period prior to the Earth Observing System (EOS) satellite launches.
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