Normalized difference vegetation index

Negative values of NDVI correspond to water. Values close to zero generally correspond to barren areas of rock, sand, or snow. Low positive values represent shrub and grassland (approximately 0.2 0.4), while high positive values indicate temperate and tropical rain-forests (values approaching 1).

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.

The metric is popular in industry because of its accuracy. It has a high correlation with the true state of vegetation on the ground. The index is easy to interpret: NDVI will be a value between -1 and 1, where values close to zero will indicate little to no vegetation, negative values are associated with non-land surfaces or water, and higher values correspond to healthy, dense vegetation. It is used in applications such as agriculture, drought monitoring, and ecosystem analysis.

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