Cryosphere

Land Ice:
	(ice sheet topography, ice sheet volume change, glacier change)
	GLAS, ASTER, ETM+/LAT1

Sea Ice:
	(extent, concentration, motion, temperature)
	AMSR, DFA/MR, MODIS, ETM+/LAT1, ASTER

Snow Cover:
	(extent, water equivalent)
	MODIS, AMSR, ASTER, ETM+/LAT1