Maybe someone here can answer this question. FAA CFR Part 107 dictates that our maximum altitude is 400FT. (I hope I read this correctly otherwise this whole conversation is moot.) It is my understanding that for the Spark, and most other drones near this class, altitude is based on the take off point being ZERO. It's not barometric or measured altitude to ground. So in my rudimentary drawing, if I take off from the top of a 100 foot hill and fly up to 400 feet, then fly out over the slope that is dropping off, my telemetry data is still going to read 400 FT yet, actually ground altitude is 500 FT. While I know the FAA doesn't necessarily have "altitude police" running around looking for drones flying too high. It is technically violating established policies. Is this your guys take as well?