NDVI

Abbreviation for "Normalized Differenced Vegetation Index" or "Normalized Density Vegetation Index". The vegetation index used in agriculture is calculated on the basis of satellite image data. Vegetation indices are one of the primary sources for observing and analysing the earth's surface. The NDVI is calculated based on the intensity of reflected light in the red and near-infrared spectral range recorded by satellites. The index is based on the fact that healthy vegetation reflects relatively little radiation in the visible spectral range and relatively much in the subsequent near-infrared range. In contrast, other surface materials such as soil, rocks, water surfaces or even dead vegetation do not show such a characteristic difference. The global NDVI in 1998:

NDVI - gobaler NDVI 1998

In viticulture, it can be used to determine the vigour, the condition of the foliage canopy and also the fruit quality, from which the necessary foliage care measures can be carried out. The optimal time for a measurement is the véraison (beginning of ripening). As a rule, there is a very wide range of variation in yield depending on the soil type and topography. The different conditions of a large vineyard are reflected in the division into blocks, sub-blocks and zones according to the NDVI measurement result. These are then not cultivated uniformly, but individually within the framework of precision viticulture. See also under Geology and Vineyard Management.

Image: by Leupold - self-created with NASA tool, public domain, link

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