Three thermal infrared channels and one solar reflective channel are applied to detect fire pixels. The brightness temperatures derived from 3.96 μm channels and the 11.03 μm channel are denoted by T22, and T31, respectively. The reflectance from the 0.86 μm channel in 1 km resolution is denoted by R2. The reflectance from R2, and the 0.65 μm channel, denoted by R1 along with the brightness temperature derived for the 12.02 μm channel (T32) and the 7.3 μm channel (T28) are used to flag cloud pixels and reject cloud edge false alarms.