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

The SMAP/CYGNSS EASE-Grid Soil Moisture, Version 1, is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set is derived by downscaling Soil Moisture Active Passive (SMAP) enhanced Level-3 9 km brightness temperatures (TB) using Cyclone Global Navigation Satellite System (CYGNSS) reflectivity data and employing a slightly modified version of the baseline SMAP active-passive TB algorithm, the Single Channel Algorithm – Vertical polarization (SCA-V).

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 due to planned mission activity today, Thursday, November 21, 2024. Operations will resume after planned mission activities are complete by Wednesday, November 22.

The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) will add 22 data sets from the Soil Moisture Active Passive (SMAP) collection to NASA Earthdata Cloud on 3 December 2024. Earthdata Cloud is NASA’s archive of Earth observations, hosted in Amazon Web Services (AWS). While these data sets will continue to be available via their current URLs and workflows, these legacy access methods will be retired soon.

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  30 June 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.

AMSR-E/AMSR2 Unified L3 Global Daily Ascending/Descending .25x.25 deg Ocean Grids, Version 1, AMSR-E/AMSR2 Unified L3 Global Weekly Ascending/Descending .25x.25 deg Ocean Grids, Version 1, and AMSR-E/AMSR2 Unified L3 Global Monthly Ascending/Descending .25x.25 deg Ocean Grids, Version 1, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The High Mountain Asia Daily 5km Landslide Hazard Indicator, Version 1 data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated.  This update adds landslide hazard indicators (LHIs) for 1990 through 2014, retrodicted using the same 30-member ensemble climate model used to project LHIs through 2100.

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 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 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 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