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Question:

How is Landsat 8’s Cirrus band (Band 9) used?

Answer:

Landsat 8's Band 9 (1.360-1.390 µm) provides detection of high-altitude cloud contamination that may not be visible in other spectral bands.  

Cirrus clouds appear bright while most land surfaces will appear dark through cloud-free atmospheres containing water vapor.

Landsat 8 Path 112 Row 66 Acquired August 3, 2013. OLI bands 4,3,2 compositeCirrus band 9 showing where the cirrus clouds are in the image.

Landsat 8 Path 112 Row 66 acquired August 3, 2013. OLI bands 4,3,2 composite (left) and Cirrus band 9 (right) showing cirrus clouds in the image.