Calculate NDVI using ENVI Software

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Normalized Difference Vegetation Index (NDVI)
This index is a measure of healthy, green vegetation. The combination of its normalized difference formulation and use of the highest absorption and reflectance regions of chlorophyll make it robust over a wide range of conditions. It can, however, saturate in dense vegetation conditions when LAI becomes high.

The value of this index ranges from -1 to 1. The common range for green vegetation is 0.2 to 0.8.

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