2.2.5. MESMA

Four endmember MESMA (a maximum mixture of three endmember classes and shade could be modeled for any given pixel) was performed on the post-fire images using the resultant eight spectral libraries. In order for a model with more endmembers to be chosen over a model with fewer endmembers, the model with more endmembers must improve the model's RMSE for the pixel by a minimum threshold of 0.007 [35]. The endmember and shade fraction were constrained to be physically reasonable (no fractions below 0 or above 1 were allowed). The shade fraction was further constrained to be no higher than 0.8. A maximum allowed RMSE of 0.025 was also used to constrain the MESMA model [21].
