NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC)

ATLAS/ICESat-2 L3B Gridded Antarctic and Arctic Land Ice Height, Version 4 and ATLAS/ICESat-2 L3B Gridded Antarctic and Arctic Land Ice Height Change, Version 4 will be retired from the NSIDC DAAC on 22 June 2026. Upon retirement, data will no longer be accessible, but all related documentation will remain available on the data set’s web page for future reference. We recommend using the latest version of these data sets, found under the “more recent version” link on the web pages.

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 4 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include new data through 31 December 2025. This data set consists of daily and monthly sea ice concentrations derived from brightness temperature measurements. This data set is available for the North and South Polar Regions, with temporal coverage extending back to 1 November 1978.

The Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 2 data set, available from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 December 2025. This data set is generated from brightness temperature data and is designed to provide a consistent time series of sea ice concentrations spanning the coverage of several passive microwave instruments.

Forward processing of SMAP L1B Radiometer Half-Orbit Radio Frequency Interference and Calibration Data, Version 6, is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set is an intermediate Level 1B radiometer data product generated by NASA’s Soil Moisture Active Passive (SMAP) mission and serves as input to the production of SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 6.

MEaSUREs Precipitation Phase and Rate from Passive Microwave Observations and Earth System Models using Transfer Learning, Version 1 is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains estimates of precipitation phase (rain, snow, or clear) and total precipitation rate at approximately 5.1 km × 13.2 km resolution along the GPM Microwave Imager (GMI) S1 swath for the time period 7 April 2014 to 6 May 2025.

The SnowEx 2020 Reynolds Creek Experimental Watershed Snow Products, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains SWE data collected from the Reynolds Creek Experimental Watershed, Idaho as part of the NASA SnowEx20 field campaign. Temporal coverage spans from 15 November 2018 to 23 February 2020.

The Moderate Resolution Imaging Spectroradiometer (MODIS), Version 61 (Collection 61) and Visible Infrared Imaging Radiometer Suite (VIIRS), Version 2 (Collection 2) data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated to include browse imagery.  Back processing of any missing browse will be completed in the near future.

The SMAP Radiometer Twice-Daily rSIR-Enhanced EASE-Grid 2.0 Brightness Temperatures, Version 3 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through December 31, 2025. This data set contains twice-daily, enhanced-resolution brightness temperature data produced by image reconstruction of the standard SMAP product, SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures (SPL1BTB).

The MEaSUREs Multi-year Reference Velocity Maps of the Antarctic Ice Sheet, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. Temporal coverage has been extended, with a new map added covering 1 July 2020 – 30 June 2022.

The MEaSUREs Annual Antarctic Ice Velocity Maps, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. New data has been added, extending the temporal coverage to June 30, 2025.

ATLAS/ICESat-2 L3B Slope-Corrected Land Ice Height Time Series (ATL11), Version 6, ATLAS/ICESat-2 L3B Daily and Monthly Gridded Sea Ice Freeboard (ATL20), Version 4 and ATLAS/ICESat-2 L3B Daily and Monthly Gridded Polar Sea Surface Height Anomaly (ATL21), Version 3 will be retired from the NSIDC DAAC on 11 May 2026.

The IceBridge Gravimeter L3 Bathymetry, Version 1 (IGBTH3) and IceBridge Gravimeter L4 Bathymetry, Version 1 (IGBTH4) data sets (formerly known as IceBridge Sander AIRGrav L3 Bathymetry and IceBridge Sander AIRGrav L4 Bathymetry, respectively), available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated.

The SnowEx23 Oct22 IOP Snow Depth Profiles, Version 1 (SNEX23_Oct22_Profiles) and SnowEx23 Oct23 IOP Snow Depth Profiles, Version 1 (SNEX23_Oct23_Profiles) data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain boreal forest and tundra snow depth profile measurements in Northern Alaska, USA; data were collected during the October 2022 and October 2023 intensive observatio

The Near Real-time SMAP L1B Radiometer Half-Orbit Time-Ordered Brightness Temperatures, Version 105, and Near Real-time SMAP L2 Radiometer Half-Orbit 36 km EASE-Grid Soil Moisture, Version 107 data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have a scheduled maintenance activity on March 18, 2026, for both NRT and Forward Production.

Version 2 of Arctic Sea Ice Seasonal Change and Melt/Freeze Climate Indicators from Satellite Data, Version 2, is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This new version includes updates to input data sources and extends the temporal coverage through 2024. More information about the new version is available in the user guide. 

ATLAS/ICESat-2 L3B Mission Composite Gridded Terrain and Canopy Elevation Parameters, Version 1 (ATL18) and ATLAS/ICESat-2 L3B Monthly Gridded Terrain and Canopy Elevation Parameters, Version 1 (ATL28) are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

Version 5 of ATLAS/ICESat-2 L3B Weekly Gridded Atmosphere, Version 5 of ATLAS/ICESat-2 L3B Monthly Gridded Atmosphere, Version 3 of ATLAS/ICESat-2 L3B Monthly Gridded Dynamic Ocean Topography, Version 1 of ATLAS/ICESat-2 L3B Monthly 3-Month Gridded Dynamic Ocean Topography, and Version 3 of ATLAS/ICESat-2 L3B Mean Inland Surface Water

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 4 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated to include new data through 31 August 2025. This data set consists of daily and monthly sea ice concentrations derived from brightness temperature measurements. This dataset is available for the north and south polar regions, with temporal coverage extending back to 1 November 1978.

Forward processing of the Calibrated Enhanced-Resolution Passive Microwave Daily EASE-Grid 2.0 Brightness Temperature ESDR, Version 2 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been paused since 3 March 2026 due to maintenance. This change affects only forward processing and does not affect existing data. Forward processing is estimated to resume in the coming weeks.