Matrice 4E RTK height issue

[Iain]

Hi all,
I have recently flown a survey mission with our Matrice 4E. But when I try to add GCP's to the job there is a 47M error between the drone data height and the GCP height I know the GCP's are correct.

The RTK height says it's at 0 this doesn't seem correct to me but I've never noticed it before and it's been fine on previous jobs before this last one which was just after a firmware update.
Any ideas on how to fix this would be appreciated.

 

[Iain]

Photo of connected RTK for conformation of the 0M height issue

 

[Dave Pitman]

Looking up the coordinate being reported for the base, it's elevation should be around 58m, not 0.

 

[Iain]

Looking up the coordinate being reported for the base, it's elevation should be around 58m, not 0.

Thanks for the reply.

That's my issue I have GPS data for the same area which I know is correct at around the 58m mark but my drone data says it's between 10-11m in height when it's run off in Terra I have never had this issue before and other than a firmware update the day before the flight nothing has changed.

So I'm at a loss as to what's happening

 

[Dave Pitman]

What is the source of the NTRIP data?

 

[Iain]

What is the source of the NTRIP data?

VRS Network subscription the same one used on the GPS data which is fine.

 

[Dave Pitman]

Do the height values in the image meta data match reality?

 

[Iain]

Forgive my ignorance but how do you check that

 

[Dave Pitman]

There are many free apps to view image exif data. But, for simplicity's sake, if you are on windows, you can right click on the image and select PROPERTIES > DETAILS (maybe similar on mac)

Scroll down to the GPS section and it displays the altitude. This should roughly correspond to the ground elevation at your flight location + the altitude of the drone.

 

[Iain]

Yes that seems to be roughly correct