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In October 2009, NASA's Ice, Cloud, and land Elevation Satellite (ICESat) stopped collecting science data. However, noting the progressive degradation of ICESat's Geoscience Laser Altimeter System (GLAS), NASA had begun the previous year to plan a series of instrumented aircraft missions to fill the impending gap in satellite observations due to the loss of GLAS. Called Operation Ice-Bridge, the project has been collecting data since March 2009 and will continue until the scheduled launch ofdoi:10.1029/2010eo380002 fatcat:bptrtrql6fg73ndjke7o6xbxpe