The satellite's mission is to survey ice thickness and ocean circulation patterns at the north and south poles.
The first CryoSat was destroyed on launch October 8, 2005 when the rocket, a converted ICBM, failed to cut out at the scheduled moment.
CryoSat-2 is mostly a rebuild of the original version, but with slight modifications and enhancements to its scientific instruments.
Once launched the satellite will be tracked from a ground station in Kiruna, northern Sweden, and controlled from the European Space Operations Centre in Darmstadt.
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