Normalized Difference Vegetation Index is used to quickly identify vegetation and its condition in remotely-sensed data.
The Normalized Difference Vegetation Index (NDVI) is a spectral index that highlights vegetation from multispectral and hyperspectral remote sensing data.
The NDVI is calculated using the formula:
where Red and NIR (Near-InfraRed) are the pixel values of the corresponding spectral bands of the satellite mission used. Since different satellite missions have different wavelengths per spectral band, a location can have different NDVI values according to different satellite missions. The NDVI is usually calculated by some tool or function or can be calculated by hand. Some satellite missions have a pre-calculated NDVI band available, like MODIS.
This tag is intended for questions around calculating and analyzing NDVI data.