This index indicates whether what is being observed by sensors contains live green vegetation or not. It is based on the reflectance of plants in the Near Infrared (NIR) and in the VISIBLE (VIS) spectra.
Chlorophyll, which is a plants’ green pigment of great importance during the photosynthesis process, strongly absorbs in the VIS. But, on the other hand, plants do not absorb in the NIR, since its wavelengths are not active in the photosynthetic region. Thus, green plants appear relatively dark in the photosynthetic region (VIS) whereas relatively bright in the NIR.
NDVI uses this approach to calculate a value for indicating the presence of plants. Positive values tend to be an area of dense vegetation, such as a forest.
VINBOT will use NDVI sensors together with colour cameras, 3D range finders and GPS to assess the canopies in the vineyards.