Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS V004

Published by NASA NSIDC DAAC | National Aeronautics and Space Administration | Metadata Last Checked: October 13, 2025 | Last Modified: 2025-03-31

This sea ice concentration data set was derived using measurements from the Scanning Multichannel Microwave Radiometer (SMMR) on the Nimbus-7 satellite and from the Special Sensor Microwave/Imager (SSM/I) sensors on the Defense Meteorological Satellite Program's (DMSP) -F8, -F11, and -F13 satellites. Measurements from the Special Sensor Microwave Imager/Sounder (SSMIS) aboard DMSP-F17 are also included. The data set has been generated using the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) Bootstrap Algorithm with daily varying tie-points. Daily (every other day prior to July 1987) and monthly data are available for both the north and south polar regions. Data are gridded on the SSM/I polar stereographic grid (25 x 25 km) and provided in two-byte integer format. Data coverage began on 01 November 1978 and is ongoing through the most current processing, with updated data processed several times annually.

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Complete Metadata

bureauCode	[ "026:00" ]
identifier	C2794540918-NSIDC_ECS
issued	1978-11-01
landingPage	https://doi.org/10.5067/X5LG68MH013O
language	[ "en-US" ]
programCode	[ "026:001" ]
spatial	-180.0 30.0 180.0 90.0
temporal	1978-11-01T00:00:00Z/2025-01-27T00:00:00Z
theme	[ "geospatial" ]