Distinguishing clouds over ice surfaces

The MODIS channel 3-6-7 blend available on Worldview is very effective at distinguishing clouds over ice surfaces. In this Worldview scene near Antarctica (1st Feb 2013; 73S, 103W), in the MODIS 3-6-7 channel blend (image below), one can see open ocean (black), surface sea/land ice (red), and clouds overlying them both (whiter hues). In visible imagery (image at bottom), it is often difficult to distinguish between clouds and sea ice. It is interesting that some of these clouds are so optically thin that one can see the outline of the ice edge through them.




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