NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC)
Data Updates
Collection 6.1 Terra forward processing has resumed at MODAPS as of 12/16/2022, following an update to the geolocation code to relax the "orbit tolerance" limit that is imposed on MODIS geolocation data generation. This became necessary, following certain changes in the Terra orbit configurations, after the last two set of Terra Constellation Exit Maneuvers (CEMs) carried out in October, 2022. All Collection 6.1 Terra and combined product generation should now be back to nominal status. A similar geolocation code update is expected for Collection 6 early next week.
The MEaSUREs Greenland Image Mosaics from Sentinel-1A and -1B, Version 4 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated. New data from 23 June 2022 to 09 October 2022 have been added.
The Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures Version 5 data set is now available through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set includes yearly snow melt onset dates over Arctic sea ice derived from Scanning Multichannel Microwave Radiometer (SMMR), Special Sensor Microwave/Imager (SSM/I), and the Special Sensor Microwave Imager/Sounder (SSMIS) brightness temperature measurements.
Images of Antarctic Ice Shelves, Version 2 (NSIDC-0102), accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been upgraded from a Basic level of service to a Standard level of service. In addition to a higher level of support, the NSIDC DAAC now provides a user guide for this data set which may be accessed through the documentation tab on the data set web page.
MODIS Collection 6 will cease forwarding processing as of 31 December 2022. Data for Collection 6 will remain available until Spring of 2023, but the NSIDC encourages users to switch to the newer Collection 6.1 data.
Additionally, users should be aware that beginning 1 December 2022, Terra has been failing in the L1 geolocation process. All Terra MODIS data processing has been put on hold while the issue is addressed. Aqua MODIS data continues to be processed.
The MEaSUREs Greenland Ice Velocity: Selected Glacier Site Velocity Maps from InSAR, Version 4 data set, accessible from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated. New data from 01 October 2021 to 12 October 2022 have been added.
The SnowEx Meteorological Station Measurements from Grand Mesa, CO, Version 1 (Snex_Met), and SnowEx Meteorological Station Measurements from Grand Mesa, CO Raw, Version 1, (Snex_Met_Raw) data sets are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The datasets contain air temperature, relative humidity, 4-component radiation, barometric pressure, soil-moisture, soil temperature and derived snow-depth measurements.
The SnowEx21 Cameron Pass Ground Penetrating Radar, Version 1 (SNEX21_COCP_GPR), and SnowEx21 Cameron Pass Ground Penetrating Radar Raw, Version 1, (SNEX21_COCP_GPR_Raw) data sets are 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 conducted at Cameron Pass, Colorado during the SnowEx21 campaign.
The AMSR-E/AMSR2 Unified L2B Global Swath Surface Precipitation, Version 1 data set archived at the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated. In November 2022, the data provider began processing and delivering the AMSR-E portion of the data (01 June 2002 to 04 October 2011) to NSIDC. We will be making these files available as we receive them. Also, the AMSR2 portion has been upgraded from Validation Stage 1 to Validation Stage 2.
The DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 6 data set, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), has been updated through 5 October 2022. This data set provides daily gridded brightness temperatures derived from passive microwave sensors and distributed in a polar stereographic projection.
The SMAP Level-4 Data Sets, accessible through the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), have been updated to version 7. For all Level-4 data products, data from the entire time series (31 March 2015 to present) are now available. Version 6 data products will be retired on 30 November 2022.
The SMAP data acquired after anomaly recovery have been determined to be high quality and consistent with the data acquired prior to the anomaly. The radiometer calibration is stable within 0.1 K and the footprint uncertainty is within 3 km. L1 brightness temperature, L2-L3 radiometer soil moisture, and freeze/thaw products acquired since anomaly recovery will be available at NSIDC on October 7, 2022. The L4 Soil moisture/Carbon products will restart assimilation of SMAP TB observations beginning with data from October 3, 2022.
The MEaSUREs Multi-year Reference Velocity Maps of the Antarctic Ice Sheet, Version 1 is now available from the National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). This data set consists of three as-complete-as-possible maps of ice velocities on the Antarctic Ice Sheet for the time periods 1995-2001, 2007-2009, 2014-2017. The maps are posted at 450 m.
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, are now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). These Near Real-Time data are available within three hours of satellite observation.