MODIS Spectral Test.

Zonal mean frequencies of cloudy conditions for October 16,2003, daytime ocean scenes as a function of three cloud detection tests and the combination of all 16 tests from MODIS. Note, in this case a single spectral test does very well, a good candidate for cloud detection comparison methods.

Zonal mean frequencies of cloudy conditions for October 16,2003, daytime land scenes as a function of three cloud detection tests and the combination of all 16 tests from MODIS.

Accumulated zonal mean cloud occurrence as various tests are added to the detection algorithm for daytime land (top) and daytime ocean (bottom) scenes.

Cloud fraction increase due to addition cloud detected by the MODIS 1.38 micron channel.