where \(R_{\text{IR}}\) and \(R_{R}\) are the reflectivity for infrared
and red bands, respectively. L is a parameter for SAVI and if it is
zero, SAVI becomes equal to NDVI. A value of 0.5 frequently appears in
the literature for L and was used in this work. Incoming longwave
radiation is calculated as in Eq. 8: