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

All SNPP VIIRS forward processing has been temporarily suspended due to a GPS anomaly issue that began at 231Z November 2, 2024. Given this degradation, all production of SNPP VIIRS land data products are suspended until further notice. Users are advised not to use any SNPP VIIRS data products that have been produced and are being distributed since 215Z on November 2, 2024. A possible mitigation effort will start today, Monday November 4, 2024; quality assurance will be performed before forward processing is resumed. NSIDC will post additional details as they are made available.

New versions of the SMAP Level-1, Level-2, and Level-3 Data Sets from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) have finished reprocessing data and are now available from 2015 to the present. The older version of each data set will be retired on 16 December 2024. After that date, data access will only be available for the newest version.

The SnowEx Mores Creek Summit (MCS) Airborne LiDAR Survey, Version 1 and SnowEx Mores Creek Summit (MCS) Airborne LiDAR Survey Raw, Version 1 data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain digital terrain models, digital surface models, snow depth models, and canopy height models as well as the corresponding raw point cloud data.

The Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors, Version 4 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated through 31 December 2023. This data set provides daily and weekly sea ice motion vectors including browse images of the weekly data. The source data used to generate the daily and weekly ice motion estimates are derived from AVHRR, AMSRE, SMMR, SSMI, and SSMI/S sensors; IABP buoys; and NCEP/NCAR Reanalysis forecasts.

The EASE-Grid Sea Ice Age, Version 4 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated through 31 December 2023. This data set provides weekly estimates of sea ice age for the Arctic derived from remotely sensed sea ice motion and sea ice extent.

Data set DOI: https://doi.org/10.5067/UTAV7490FEPB

The LVIS Facility L1B Geolocated Return Energy Waveforms, Version 1 and LVIS Facility L2 Geolocated Surface Elevation and Canopy Height Product, Version 1 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated.

High Mountain Asia 2 m DEM, Surface Velocity, and Lagrangian Surface Mass Balance for Select Debris Covered Glaciers, Version 1, is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set contains 2 m resolution digital elevation models (DEMs), surface velocities, surface mass balance (SMB) rates, and SMB uncertainties for six debris-covered glaciers in Nepal.

The SMAP-derived 1-km downscaled surface soil moisture product, Version 1 data set available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated through June 2024. This data product contains global daily 1-km resolution surface soil moisture obtained from the SMAP L-band radiometer and is available in GeoTIFF format.

The SnowEx21 Prairie Station Digital Surface Models from UAV-LiDAR, Version 1 and SnowEx21 Prairie Station Hourly Meteorological Data, Version 1 data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain Digital Surface Models derived from UAV-LiDAR and hourly meteorological data acquired during the SnowEx 2021 field campaign.

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 been experiencing a data outage since 1 October, 2024. The project team is investigating the cause of the outage and is actively working on resuming operations. We apologize for any inconvenience that this may cause.

L1B SMAP Reflectometry, Version 1 is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This product represents the first full polarimetric Global Navigation Satellite System Reflectometry (GNSS-R) dataset, derived from the Soil Moisture Active Passive (SMAP) mission radar. The main parameters are the normalized Stokes parameters, total power normalized bistatic radar cross-section, and reflectivity.

The Daily 4 km Gridded SWE and Snow Depth from Assimilated In-Situ and Modeled Data over the Conterminous US, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The temporal coverage has been extended to 30 September 2023 by adding the latest water year.

Data set DOI: https://doi.org/10.5067/0GGPB220EX6A

The Near Real-Time MODIS/Terra L3 Global Daily 500m SIN Grid Snow Cover, Grain Size, and Dust Radiative Forcing, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The temporal coverage has been extended to include files from 1 April 2024 through 30 June 2024.

Data set DOI:  https://doi.org/10.5067/HNVFRD5ICZN1

The ICESat-2 L4 Monthly Gridded Sea Ice Thickness, Version 3 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated. The temporal coverage has been extended by adding the monthly files from September 2023 through April 2024.

Data set DOI: https://doi.org/10.5067/ZCSU8Y5U1BQW

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 March 2024. 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.

The SnowEx17 GPR and Lidar-Derived Snowpack Relative Permittivities and Densities, 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 the results of 1 GHz ground-penetrating radar surveys (GPR) conducted in Grand Mesa, Colorado, USA.  Data include two-way travel time, lidar-measured snow depth, calculated snow water equivalent, calculated snow density, and calculated relative permittivity.

The MEaSUREs Greenland Annual Ice Sheet Velocity Mosaics from SAR and Landsat, Version 5, the MEaSUREs Greenland Quarterly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 5, and the MEaSUREs Greenland Monthly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 5 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated.

The Glacial and Fast Ice Distributions in Southeast Greenland Fjords, Version 1 dataset is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set provides spatial distributions of fast ice and glacial ice in eight fjords spanning the Southeast Greenland coast: Nansen, Kangerlusruaq, Ikertivaq, Skjoldungen, Tingmiarmiut, Napasorsvaq, Anoritup, and Kangerlluluk. Included in the dataset are all the fjord data along the Southeast Greenland coast.

The SnowEx23 CRREL Ground Penetrating Radar, Version 1 and SnowEx23 CRREL Ground Penetrating Radar Raw, Version 1 data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These data sets contain the results of 1 GHz ground-penetrating radar surveys conducted in Alaska, USA and the corresponding raw data.