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backscatter(19)
synthetic aperture radar(9)
satellite imagery(8)
arctic(7)
sea ice(7)
snow cover(5)
in situ measurement(4)
algorithm(3)
canada(3)
observational method(3)
pixel(3)
polarization(3)
radar(3)
remote sensing(3)
russian federation(3)
satellite data(3)
snowpack(3)
accuracy assessment(2)
antarctica(2)
digital elevation model(2)
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