Enhanced Vegetation Index (EVI) and its significance in agriculture monitoring

The enhanced vegetation index (EVI) has earned a huge attention to monitoring the vegetation quality and quantity like Normalized Difference Vegetation Index (NDVI).

It is represented as an optimized vegetation index invented by Liu and Huete to improve the vegetation signal with better sensitivity in high biomass areas. The primary use of EVI is to correct NDVI results simultaneously for atmospheric changes as well as soil background signals mainly in dense canopy zones.

The EVI can be determined in the form of following equations:

EVI= (NIR-RED)(NIR+C1*RED-C2 * BLUE + L)

• Where NIR/red/blue represents the automatically corrected surface reflectances.
• “L” refers to the canopy background adjustment which defines non-linear.
• Differential NIR and red radiant transfer through a canopy.
• And C1, C2 are the coefficients of the aerosol resistance term.

The value of EVI ranges from -1 to 1. The EVI is very useful in analyzing crop yield forecasting, crop growth pattern and mapping the crop phenology, and detecting land use land cover target features.

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