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Shadow Index (SI)

The characteristics of canopy shadow are associated by the total spectral radiance that is reflected from the canopy. Canopy shadow provides essential information about trees and plants arrangement. As a remote sensing index, Shadow Index (SI) is calculated using the visible bands of the spectrum, in a way that simulates the amount energy not reflected back to the sensor.

SI has main applications in forestry and crop monitoring. It is usually combined with AVI and BSI to help understand the status of vegetation.

Our Spaceye product uses the blue, red and green spectral bands from various satellites (Landsat 8 OLI, Landsat 5 TM, Sentinel 2 MSI) to calculate the SI with the following formulas (one for each satellite):


Our SI product is produced for the whole globe from 1985 to today with timely temporal resolution!

si pallet

 Index: SI