What is chlorophyll vegetation index?
What is chlorophyll vegetation index?
In remote sensing, the Green Chlorophyll Index is used to estimate the content of leaf chlorophyll in various species of plants. The chlorophyll content reflects the physiological state of vegetation; it decreases in stressed plants and can therefore be used as a measurement of plant health.
What is vegetation index in remote sensing?
A vegetation index (also called a vegetative index) is a single number that quantifies vegetation biomass and/or plant vigor for each pixel in a remote sensing image. The index is computed using several spectral bands that are sensitive to plant biomass and vigor.
How is Evi calculated?
These enhancements allow for index calculation as a ratio between the R and NIR values, while reducing the background noise, atmospheric noise, and saturation in most cases. In Landsat 4-7, EVI = 2.5 * ((Band 4 – Band 3) / (Band 4 + 6 * Band 3 – 7.5 * Band 1 + 1)).
Why are red and near infrared bands used in the NDVI vegetation index?
As shown below, Normalized Difference Vegetation Index (NDVI) uses the NIR and red channels in its formula. Healthy vegetation (chlorophyll) reflects more near-infrared (NIR) and green light compared to other wavelengths. But it absorbs more red and blue light. This is why our eyes see vegetation as the color green.
Why do we use NDVI?
Simply put, NDVI helps to differentiate vegetation from other types of land cover (artificial) and determine its overall state. It also allows to define and visualize vegetated areas on the map as well as detect abnormal changes in the growth process.
What is chlorophyll content index?
Canopy Chlorophyll Content Index (CCCI) is a two-dimensional remote sensing index, derived from the Normalized Difference Vegetation Index (NDVI) and Normalized Difference Red Edge (NDRE).
What is transformed vegetation index?
Transformed Vegetation Index: A commonly used vegetation index derived from images of certain spectral bands. The TVI is equal to the square root of the quotient of the photo-infrared minus the red band, and the photo-infrared plus the red band {SQRT[(IR – red) / (IR + red)]}.
Why are the red and near-infrared bands particularly useful for monitoring vegetation?
Since chlorophyll absorbs red light, this band is commonly used to monitor the growth and health of trees, grasses, shrubs, and crops. Red light can also help distinguish between different types of plants on a broad scale.
