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: h

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: https://agribotix.com/blog/2014/06/10/misconceptions-about-uav-collected-ndvi-imagery-and-the-agribotix-experience-in-ground-truthing-these-images-for-agriculture/ https://agribotix.com/blog/2014/06/10/misconceptions-about-u... https://en.wikipedia.org/wiki/Normalized_difference_vegetation_index https://en.wikipedia.org/wiki/Normalized_difference_vegetati... More ideas: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4600171/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4600171/