# `RVI` (Radar Vegetation Index)

This functionality computes the Radar vegetation index for full polarimetric SAR data. The required input and the computed output are as follows:

    input : input_T3/C3_folder, window_size
    output : RVI_FP.bin

The formulation of RVI is as follows:

\[\text{RVI}_{fp} = \frac{4 \times \lambda_3}{\lambda_1+\lambda_2+\lambda_3}\]

where, \(\lambda_1, \lambda_2\) and \(\lambda_3\) are the eigen values of coherency matrix (T3) in descending order (\(\lambda_1 > \lambda_2 > \lambda_3\)). Further details can be found in [[8]](#8)