True. However if we're looking for very brief landings followed by periods of flight you might see that in the pressure data.
You'd expect some flat "flight level" pressure over a day, with V pressure changes to correlate with landings (or swoops in mid-air). You would need to correlate these with other sensors for it to mean anything concrete but it could corroborate or disprove other theories.
Right, but you couldn't distinguish a V that was a brief landing from a V that was a dive and climb, nor could you distinguish a flat line that was cruising from a flat line that was sitting on the ground.
I don't doubt that pressure data would be useful, it just doesn't give you altitude data.
You'd expect some flat "flight level" pressure over a day, with V pressure changes to correlate with landings (or swoops in mid-air). You would need to correlate these with other sensors for it to mean anything concrete but it could corroborate or disprove other theories.