"Stage for Delivery" orders in NASA's Earthdata Search will be disabled between Tuesday, May 30, 6 pm (US Mountain Time) and Thursday, June 1, 7 am (US Mountain Time) for planned system maintenance. During this period, users will not be able to request data using this access method. All other download methods will remain available (except during the NSIDC DAAC scheduled downtime).
On Wednesday, May 31st from 7:30 a.m. to 10:30 a.m. (US Mountain Time), the following data collections may not be available due to planned system maintenance: ASO, AMSR Unified, AMSR-E, Aquarius, High Mountain Asia, IceBridge, ICESat/GLAS, ICESat-2, LVIS, MEaSUREs, MODIS, Nimbus, SMAP, SnowEx, SSM/I-SSMIS and VIIRS.
AMSR Unified - Advanced Microwave Scanning Radiometers
The NSIDC DAAC Advanced Microwave Scanning Radiometer Unified (AMSR Unified) collection includes passive microwave data products on snow, sea ice, soil moisture, vegetation water content, and brightness temperature. The AMSR-U collection has been designed to incorporate data from the Advanced Microwave Scanning Radiometer - Earth Observing System Sensor (AMSR-E) sensor and the Advanced Microwave Scanning Radiometer2 (AMSR2) sensor.
From 2002 to 2011, AMSR-E flew onboard NASA's Aqua satellite, collecting passive microwave measurements of land and ocean parameters related to global water and energy cycles. You can learn more about the AMSR-E instrument by visiting the NSIDC DAAC AMSR-E collection.
AMSR2 has operated since 2012 onboard the Global Change Observation Mission 1st - Water "SHIZUKU" (GCOM-W1) satellite. The GCOM-W1 mission aims to establish a global, long-term observation system to improve understanding of the mechanisms of climate and water cycle variations. AMSR2 measures microwave emissions from the Earth's surface and atmosphere. It collects both daytime and nighttime observations of Earth, observing more than 99 percent of the planet every two days. For more information about AMSR2, refer to the About AMSR2 - Observing System on the GCOM-W1 website.
As a follow-on instrument to AMSR-E, AMSR2 offers enhanced spatial resolution, better calibration, and improved mitigation of radio-frequency interference. Because AMSR2 has been designed as a follow-on mission to AMSR-E, it makes observations that are spatially consistent, easily continuing the data record. Combining reprocessed AMSR-E data with subsequent AMSR2 observations provides a nearly continuous record dating back to 2002. As new data products become available, they are added to the collection.
The NSIDC DAAC distributes daily, weekly, and monthly Level-2B and Level-3 AMSR Unified products.
The NSIDC DAAC also hosts two other data collections derived from other AMSR sensors that have flown aboard polar-orbiting satellites making global observations. The other collections include:
- The AMSR-E data collection comes from the AMSR-E sensor that flew onboard NASA’s Aqua satellite, observing interactions between snow and ice, and Earth's atmosphere and ocean.
- The NSIDC DAAC AMSR/ADEOS-II data collection includes passive microwave measurements from the Advanced Microwave Scanning Radiometer Sensor (AMSR). Observations cover early 2003 through October 24, 2003. This collection includes Level-1A and Level-2A products containing sensor counts and brightness temperature
Brightness temperature, sea ice concentration, sea ice motion, precipitation, snow depth, snow water equivalent, soil moisture, vegetation water content
Sensor(s) and satellite(s)
AMSR2 flies onboard the Japan Aerospace Exploration Agency (JAXA) Global Change Observation Mission 1st - Water "SHIZUKU" (GCOM-W1) satellite, which launched on May 18, 2012.
AMSR-E flew onboard NASA's Aqua satellite, which launched on May 2, 2002, and ceased operations on December 4, 2011.