BIOSPHERE>VEGETATION>VEGETATION INDEX>NORMALIZED DIFFERENCE VEGETATION INDEX (NDVI)
2 DJI INSPIRE drones with following sensor options
S4 RGB camere
Tau2 TIR Camera
MaxMax NDVI camera
Micasense RedEdge camera
Ceck and if neccessary clean optics before flight
For NDVI start by imaging calibration targets prior to each flight an repeat at end of each flight.