We used a Micasense calibration target (not sure which version, but guessing older since Pix4D doesn’t do automatic marking–see photo) with a Parrot Sequoia camera.
Only 1 of 7 eBee Plus flights had the green calibration photo not overexposed according to Pix4D’s automatic cutoff of dn < 63,000, and only 2 had the red calibration photo not overexposed, and they were early morning flights with long shadows which are not recommended. When using a Phantom 4 Pro, we had some green and red calibration photos overexposed but not nearly as many. We had no overexposure when using an Airinov calibration target instead of Micasense. Is the above Micasense panel just not a good choice when using a Sequoia camera due to being bright white?
Is it just a coincidence that flying with the eBee Plus caused more overexposure than with the Phantom 4 Pro? We don’t have the time to cover 1000 Ha sites with the slow Phantom 4 Pro.
I guess we are stuck relying on just the sun sensor, no calibration, for the whole site last year since the one flight that didn’t overexpose is clearly not representative of all the other flights’ conditions. How much might it affect our NDVI results to not calibrate?