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550 4 2015-12-28
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Samadams467
lvl.2

United States
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I am using my drone for photogrammetry and I can not figure out if the Phantom 3 Pro uses its flight altitutde of 0' from sea level or from take off point. If it is from take off point then how can I zero it each time?
2015-12-28
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labroides
Captain
Flight distance : 9991457 ft
Australia
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The only height the Phantom knows is Home = zero
It has no way of knowing where sea level is and there's no way to zero it.
2015-12-28
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Samadams467
lvl.2

United States
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labroides@yahoo Posted at 2015-12-28 15:35
The only height the Phantom knows is Home = zero
It has no way of knowing where sea level is and the ...

interesting. Okay thank you.
2015-12-28
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mike.wildlight
Second Officer
Flight distance : 5623 ft
Australia
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In the latest version of the firmware the phantom records GPS elevations in EXIF. Previously this was barometric altitude above take-off point.
GPS elevations are notoriously inaccurate.
However, if you fly at a constant elevation over your take off point and average a lot of images you'll be able to get a more accurate representation of absolute altitude. (haven't tried this yet as I'm still on 1.4.10

Edit: I do believe it still records baro altitude somewhere
2015-12-28
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DJI-Tim
DJI team

Hong Kong
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It counts the altitude from take off point, but not from the sea level
2015-12-28
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