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

The Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 1 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 December 2020. 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 Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 3 data set, available through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 December 2020. 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 a temporal coverage extending back to 26 October 1978.

The Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 1 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 December 2020. 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.

Selected SMAP Level-1, -2, and -3 data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), can now be subsetted for a spatial area defined by a shapefile, KML/KMZ, or GeoJSON. This service can be invoked via NASA Earthdata Search or via programmatic access.

The following help articles describe all the customization services currently available for these SMAP data sets and give instructions on data access through NASA Earthdata Search or programmatically:

The High Mountain Asia Rasterized PyGEM Glacier Projections with RCP Scenarios, 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 a rasterized (gridded) version of the glacier point data from the Python Glacier Evolution Model (PyGEM).

The DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures, Version 2 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 December 2020. This will be the final update for this data set. Data will remain online until the data set is retired at the end of 2021.

The LVIS Facility L2 Geolocated Surface Elevation and Canopy Height Product, Version 1 data set has been updated at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) to now include data from engineering test flights held on 07 November 2018 and 31 January 2019 over sites in Maryland, Virginia, and North Carolina.

The LVIS Facility L1B Geolocated Return Energy Waveforms, Version 1 data set has been updated at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) to now include data from engineering test flights held on 07 November 2018 and 31 January 2019 over sites in Maryland, Virginia, and North Carolina. This data set contains Level-1B geolocated return energy waveforms collected by the NASA Land, Vegetation, and Ice Sensor (LVIS) Facility, an airborne lidar scanning laser altimeter.

The LVIS L1A Geotagged Images, Version 1 data set has been updated at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) to now include data from engineering test flights held on 07 November 2018 and 31 January 2019 over sites in Maryland, Virginia, and North Carolina. This data set contains geotagged images taken by two NASA Digital Mapping Cameras, which were mounted alongside the Land, Vegetation, and Ice Sensor (LVIS), an airborne lidar scanning laser altimeter.

The DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 5 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 1 January 2021. This will be the last update provided in binary data format. This data set will transition to netCDF data format with the next update. All existing data in this data set will also be converted to netCDF.

Newly re-processed SMAP Level-1, -2, -3, and -4 data sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), contain antenna scan angle (ASA) errors. ASA errors affected a large number of data files between 05 Oct and 23 Nov 2019, as well as a handful of dates within 2020 (04 and 05 Feb, 09 Apr, 30 May, and 18 Jun). These bad data are not currently identified by data quality flags. The ASA errors disrupt the proper geolocation of half-orbits, which may be off by as much as 99 km in the along scan direction.

The MEaSUREs Greenland Annual/Quarterly/Monthly Ice Sheet Velocity Mosaics from SAR and Landsat, Version 2 data sets have been updated. These annual, quarterly and monthly data sets have been reprocessed using a more rigorous culling scheme and a new DEM. The dT parameter, which can be used to assess the temporal skew in the data, is now also available for the annual and monthly data sets. New data have been added so the data sets now span 01 December 2014 - 30 November 2019. The data are available as cloud-optimized GeoTIFFs and the file naming convention has changed.

The SnowEx20 Grand Mesa IOP BSU 1 GHz Multi-polarization GPR CMP Snow Water Equivalent, Version 1 and SnowEx20 Grand Mesa IOP BSU Multi-polarization 1 GHz GPR CMP Travel-Times, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The SnowEx20 COSMOS Rover Soil Moisture, Version 1 and SnowEx20 COSMOS Stationary Soil Moisture, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The SnowEx20 Raw Near Surface Snow Temperature Profile Time Series, Version 1 and SnowEx20 Grand Mesa IOP BSU Multi-polarization 1 GHz GPR CMP Raw, Version 1 data sets, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).

The IceBridge CAMBOT L0 Raw Imagery, 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 raw images and associated aircraft position and attitude data taken over Antarctica and Greenland by the Continuous Airborne Mapping By Optical Translator (CAMBOT), part of the Airborne Topographic Mapper (ATM) instrument suite. Data are available from 10 October 2018 through 20 November 2019.

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS, Version 3 data set, available through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 31 October 2020. 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 a temporal coverage extending back to 26 October 1978.

The SnowEx20 Grand Mesa IOP BSU 1 GHz Multi-polarization GPR, 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 snow water equivalent (SWE) and snow depth estimates derived from Ground Penetrating Radar (GPR) measurements. GPR measurements were collected during the SnowEx 2020 Grand Mesa Intensive Observation Period (IOP) between 28 January and 04 February 2020.

The SnowEx20 Boise State University Terrestrial Laser Scanner (TLS) Point Cloud, Version 1 and SnowEx20 Boise State University Raw Terrestrial Laser Scanner (TLS) Point Cloud, 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 processed and raw terrestrial laser scanner (TLS) point cloud data collected as part of the 2020 SnowEx campaign in Grand Mesa, Colorado.

The Multilayer Greenland Ice Surface Temperature, Surface Albedo, and Water Vapor from MODIS, Version 1 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated with temporal coverage through 31 December 2019 and corrected projection metadata. This data set contains MODIS ice surface temperature, surface albedo, water vapor, and derived melt maps, for Greenland. These data are provided at a spatial resolution of 0.78 km.