PRECISION AGRICULTURE

Vegetation indices

VEGETATION INDICES FOR KNOWING THE TERRAIN

Vegetation indices are an essential tool in precision agriculture, as they allow the conversion of image data into knowledge on the ground.

The indices that can be derived from multispectral images are different and, being all sensitive to changes in chlorophyll content and/or vegetative vigour, they allow detecting possible changes in plant physiology, through the indices it is possible to monitor the health status of crops.

The following table summarises the most important indices:

VEGETATION INDICES FOR KNOWING THE TERRAIN

Vegetation indices are an essential tool in precision agriculture, as they allow the conversion of image data into knowledge on the ground.

The indices that can be derived from multispectral images are different and, being all sensitive to changes in chlorophyll content and/or vegetative vigour, they allow detecting possible changes in plant physiology, through the indices it is possible to monitor the health status of crops.

The following table summarises the most important indices:

Characteristics and applications

vegetation indices Characteristics and applications


NDVI

NDVI Normalised Difference Vegetation Index Index describing the normalised difference between the near infrared and visible red bands of vegetation cover. It can be used to estimate the vegetative vigour of plants, which will monitor their health status
BNDVI Blue Normalised Difference Vegetation Index Band index in red using visible blue, for areas sensitive to chlorophyll content
GNDVI Green normalised difference vegetation index Non-banded red index using visible green, to measure photosynthetics and monitor plant stress.
NDRE


Normalised Difference Red Boundary

Index sensitive to chlorophyll content in leaves. It is suitable for the study of plants in advanced phenological stages
LCI
Foliar chlorophyll index
Index allows assessment of chlorophyll content in situations of complete leaf coverage
TGI
Triangular Green Index
RGB index sensitive to chlorophyll content in situations of high leaf coverage. Can be useful to detect nitrogen needs of plants
VARI
Visible Atmospheric Resistance Index
RGB index sensitive to weather insensitive sail cover
MCARI
Chlorophyll absorption modified reflectance index
Index measuring chlorophyll concentrations, is sensitive to variations in leaf area index (LAI)