Didn't know that???
Air pressure is based on temperature, humidity, elevation.
If you calibrate IMU inside (barometer takes a reading) in a AC room without humidity and go outside where is hot and humid, do you think you get the same altitude readings?
You start your drone on the ground, outside, right? Why calibrate IMU inside and at a different height than you fly from? Just make sure the "ground" is very leveled.
Air pressure is based on temperature, humidity, elevation.
If you calibrate IMU inside (barometer takes a reading) in a AC room without humidity and go outside where is hot and humid, do you think you get the same altitude readings?
You start your drone on the ground, outside, right? Why calibrate IMU inside and at a different height than you fly from? Just make sure the "ground" is very leveled.