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Uneven Terrain and Max Altitudes
618 4 2019-3-29
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SH59
Captain
Flight distance : 4291 ft

United States
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Have what might be a dumb question, but needed to know the answer.

1.)  If I'm at the bottom of a hill that is say 300' (vertical face). If I have my max altitude set to 200', I'll never reach the top of the hill correct?

2.)  If I'm at the TOP of that same 300' hill, and still have my drone set to 200' max altitude and I fly off the edge of it....will my drone drop 100' to compensate, or will it fly straight out and RTH if needed?     

I know I can increase the max altitude to 300' or higher to compensate, but wanted to understand better how this would work.   

2019-3-29
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Boffin
First Officer
Australia
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Your 200' maximum altitude is relative to the take-off point. So if you take off from the top of a 300' hill and ascend by 200' then you are now 500' above the base of the hill
2019-3-29
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SH59
Captain
Flight distance : 4291 ft

United States
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Boffin Posted at 3-29 17:17
Your 200' maximum altitude is relative to the take-off point. So if you take off from the top of a 300' hill and ascend by 200' then you are now 500' above the base of the hill

So if I'm at the top of a 300' hill...would my take off point altitude be 0', or 300'?  

And if I fly over the edge of the 300' hill, does my altitude stay at 0', or would it change to 300' which would exceed my max altitude by 100'?  







  
2019-3-30
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Boffin
First Officer
Australia
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SH59 Posted at 3-30 13:44
So if I'm at the top of a 300' hill...would my take off point altitude be 0', or 300'?  

And if I fly over the edge of the 300' hill, does my altitude stay at 0', or would it change to 300' which would exceed my max altitude by 100'?

As far as your drone's IMU  is concerned the top of a hill is 0' and the height during flight is calculated relative to this.

The drone does not know how high the hill is. The surrounding terrain could be 1000' above sea level which puts the top of the hill at 1300' above sea level - the drone does not know this.

If you fly over the side of the hill, altitude would remain at 0' - if you then descend then the altitude becomes -  (negative) with respect to the take off point.

This is how it works with my Mavic Pro as I often fly from the hills where I live

2019-3-30
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SH59
Captain
Flight distance : 4291 ft

United States
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Excellent. That's exactly what I needed to know. Thank you!
2019-3-30
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