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The take away is that they measure the amount of red light compared to infrared and if there's more red the plants are less healthy.
by superkuh 3y ago
The take away is that they measure the amount of red light compared to infrared and if there's more red the plants are less healthy.
- ansgri 3y agoTo expand a little: chlorophyll absorbs red and blue, but reflects green and NIR (near infrared, just beyond visibility), so basically it measures how "green" the plants are, but using NIR instead of green as its a more robust measure. Also infrared photography is cool because plants are bright white.