MAVIC photo coordinate elevation differs -18.4m then Google Earth and GPS equipment

[Alvaro Lopes]

Hi
Photos taken by Mavic in my fligths survey services differs from my GPS survey equipment for about -18.4m.
Identicaly in Google Earth that is +/- the diference!
I'm working in UTM 33s 15d (Angola).

How can I resolve this issue?

The Mavic GPS should be calibrated?

Rgds

Álvaro Lopes

 

[Robert Mitchell]

Is it always in the same direction?
Have you compared this deviation with any other reference source other than Google Earth?

 

[Alvaro Lopes]

Hi

I only compared with my GPS survey equipment.

With coordinates no problem only with the elevation.

 

[Bunny Too]

Hi

I only compared with my GPS survey equipment.

With coordinates no problem only with the elevation.

So the Mavic is off by 18.4 meters vertically?

 

[Alvaro Lopes]

Yes

Thats the problem

 

[Bunny Too]

Yes

Thats the problem

At what altitude is the error being demonstrated? Consistently or when the Mavic is at high altitude or low altitude? The Mavic uses a few different methods to determine vertical positioning.

 

[Bunny Too]

And you state that is the same error demonstrated in Google earth?

 

[Alvaro Lopes]

Yesterday I take photos at 0m, 2m and 86m.
I compare the photo altitude with the local altitude given by GE.

I started to do some survey fligths for my work as civil engineer.
For that I have to have some GPS control points in terrain.
Before using a mapper software the elevation taken by the fligth in those points have that difference.

 

[Alvaro Lopes]

Yes

 

[Ed_2020]

I don't believe Google Earth has the same precision level all over the planet.

Did you check Mavick against some known height around you? (A building for example)