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Using Vegetation Indices

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Using Vegetation Indices

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Vegetation indices are based on the fact that different surfaces reflect types of light differently. Vegetation that is photosynthetically active absorbs more of the red light that strikes it and reflects most of the near infrared light. A vegetation index, like the popular Normalized Difference Vegetation Index (NDVI) works as an indicator that describes the greenness or density and health of vegetation based on the measurement of absorption and reflectance using a spectroradiometer or spectrometer. NDVI is calculated as the normalized difference between the red and near infrare4d bands of a spectral measurement according to the formula: NDVI = (NIR-RED)/(NIR+RED)

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