Normalized difference vegetation index

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What Wikipedia says

The normalized difference vegetation index (NDVI) is a widely used metric for quantifying the health and density of vegetation using sensor data. It is calculated from spectrometric data at two specific bands: red and near-infrared. The spectrometric data is usually sourced from remote sensors, such as satellites.

Excerpt from the Wikipedia article “Normalized difference vegetation index”, under the CC BY-SA 4.0 license. Read the article on Wikipedia