How to calculate Canopy shadow Index (SI) in ArcGIS | Canopy shadow Index | Forest Canopy Density

Описание: CANOPY SHADOW INDEX (SI)
Canopy shadow Index (SI) The characteristics of canopy shadow are defined by spectral information and thermal information of the forest shadow. The shadow pattern is depend on trees and plants arrangement pattern of the forest. In the field of Remote sensing forest shadow is characterized by Canopy shadow Index (SI). The young plants have low value of canopy shadow index compared to the old natural forest shadow. The shadow index is derived from the low radiance of visible bands When the forest canopy is very dense, satellite data is not always be able to indicate the relative intensity of the shadow. The shadow index is formulated through extraction of the low radiance of visible bands.Canopy Shadow provides essential information about tree and plant arrangements. The characteristics of canopy shadow are associated by the total spectral radiance that is reflected from the canopy. Shadow Index (SI) is calculated using the red, blue, and green bands in a way that simulates the amount of energy not reflected back to the sensor. The main application for this is in forestry and crop monitoring, and can be combined with AVI and BSI to understand vegetation status.
SI (Landsat 8 OLI) : Red=B2, Green=B3, Blue=B4
SI (Landsat 5 TM) : Red=B1, Green=B2, Blue=B3
SI (Sentinel 2 MSI) : Red=B2, Green=B3, Blue=B4
SI = [(1-Red)*(1-Green)*(1-Blue)] 1/