Drone altitude about mobile-sdk-ios

[doniekelly]

Could you expose the GPS altitude for reference as obtained from the GPS chip you use? We can work with that figure. I understand why you might want to abstract this info but we have an application where we are translating the altitude into real world coordinates and this existing altitude is hard to work with...

@property(nonatomic, readonly) float gpsAltitude;

[anathan]

+1 also interested in this. We've found the reported altitude not to reflect any coordinate system we could understand.

[d0n13]

It would appear to be the barometer. How accurate is that? Doesn't it get messy depending on the current pressure etc. How is it calibrated?

[anathan]

at least in the p3, its more than just the barometer. It also may be using the sonar sensors on the base if so equipped.

[d0n13]

What I do at the moment is use whichever altitude is higher. So max(ultrasonic, barometer).

A confirmation from DJI on how to handle this would be good.

[oliverou]

Hi @d0n13, @anathan, currently, we only provide the following API for you to get the relative altitude of the aircraft in DJIFlightControllerState.h file:

@property(nonatomic, readonly) float altitude;

It's measured by the barometer, in meters. The error range is around 5 meters.

[satomacoto]

Hi @oliverou

The error range is around 5 meters.

I'd like to know more detail about "the error range".
When is the error range around 5 meters? Or, Is there any document about it?

[Michael-DJI]

Hi, did you resolve your issue with new version?
if not, pls report the issue to [email protected] it's the official channel to request DJI SDK support now.

[d0n13]

I’ll check it out

…

On 13 Dec 2018, at 11:17, Michael ***@***.***> wrote: Hi, did you resolve your issue with new version? if not, pls report the issue to ***@***.*** it's the official channel to request DJI SDK support now. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.