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for some sensors. Existing satellite data provide a powerful resource for understanding how and why the polar regions have experienced such large changes in recent decades. New EOS-era sensors will fill in some details, to be sure, but data records from these sensors for studying change will not be available for many years, if they indeed receive continued support for “long-term” monitoring. Various recommendations in Chapter 5 focus on the use of existing data sets in the more general contexts of ESE science and change detection, and also in the more specific context of NASA's DAACs and their provision of useful data sets to the science community.



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