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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 is the relationship between red and NIR reflectance so important for vegetation studies?
Healthy vegetation absorbs blue- and red-light energy to fuel photosynthesis and create chlorophyll. Thus, analyzing a plants spectrum of both absorption and reflection in visible and in infrared wavelengths can provide information about the plants’ health and productivity.
Which two spectral bands are used in the calculation of the normalized difference vegetation ratio NDVI )?
The NDVI is computed as the difference between near-infrared (NIR) and red (RED) reflectance divided by their sum.
Which is better G banding or heterochromatic banding?
Euchromatic banding techniques, especially G-banding, are ideal, but euchromatic bands are essentially restricted to higher vertebrates. However, even in organisms that lack euchromatic bands, distinctive patterns of heterochromatic banding can often be used to distinguish between chromosomes.
When does the peak of a chromatographic band occur?
The signal rises up from the baseline as the red band first enters the cell, and the peak representing the red band begins to be drawn. In this diagram, the red band has not fully passed through the flow cell.
How is G banding used to identify chromosomes?
However, even in organisms that lack euchromatic bands, distinctive patterns of heterochromatic banding can often be used to distinguish between chromosomes. In humans, G-banding is used to identify chromosome abnormalities and rearrangements in genetic diseases and cancers.
When does the red band pass through the flow cell?
Since most of the red band has passed through the cell, most of the peak has been drawn, as shown by the solid line. If we would continue the chromatographic process, the red band would completely pass through the flow cell and the red peak would be completed [dotted line].