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Vegetation indices

Satellite imagery captures light reflected from the Earth's surface. Plants reflect specific wavelengths at different stages of development which can indicate crop health and anomalies in the growing cycle.

In an effort to monitor major fluctuations in vegetation and understand how they affect the environment, Earth scientists began using satellite remote sensors to measure and map the density of green vegetation over the Earth. By measuring the wavelengths and intensity of visible and near-infrared light reflected by the land surface back up into space, scientists designed algorithms, vegetation indices to quantify the concentrations of green leaf vegetation and monitor crop vitality, biomass, chlorophyll content and photosynthetic activity, and canopy structural variations, among others.

Vegetation indices have been used to:

  • examine climate trends
  • estimate water content of soils remotely
  • monitor drought
  • schedule crop irrigation and crop management
  • monitor evaporation and plant transpiration
  • assess changes in biodiversity
  • classify vegetation

Screenshot: NDVI map of a farm.

Ansovino provides two vegetation indices for your farm:

  • NDVI — The normalized difference vegetation index is a simple graphical indicator that can be used to assessing whether or not the target being observed contains live green vegetation.
  • EVI — The enhanced vegetation index is an optimized vegetation index designed to enhance the vegetation signal with improved sensitivity in high biomass regions and improved vegetation monitoring through a de-coupling of the canopy background signal and a reduction in atmosphere influences.

EVI and NDVI data provide a measurement of crop health, and changes in vegetation over time.

Screenshot: EVI and NDVI chart.

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