Hi LokeRichard suggested using a NDVI approach which would require data in the
Near Infrared (NIR) band. An orthomisaic would contain 3 colour bands, but not
the NIR. NDVI provides an understanding of plant greenness and health and may
not be suitable for detecting oil palm's. If you are getting 90 percent plus
with your current approach , you may find that you will spend 4 times longer
capturing the additional 10 percent. NIR data,are available from various
satellite sensors however, their resolution would not work at the individual
plant level.Some drone sensors record the NIR band.Kirk SchmidtSent from my
Galaxy
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