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NDVI is a direction a lot of drone people are going, and probably a good place to start to get a sense of techniques and work being done in plant monitoring:

Thank you :)

There are some people doing something similar with drones. Just saw a presentation on this a few weeks back. https://support.dronedeploy.com/v1.0/docs/ndvi-algorithms. Measures the difference between blue and near infrared to infer things about plant health, although I don't believe it indicates for specific diseases. Good luck with your work!

Thank you :)

What do you mean " extracting meaning "?

Notifying you that your plant needs water, has mites, needs more nutrients, not enough light, etc.