Frame of FMV in ArcGIS Pro is wrong or....

Question

Hi, I try to use FMV butI have a problem. Please check the image I attach.

I did a fly with Phantom Pro v2.0 with Site Scan App (not LE). I used the Inspection fly type with video mode. I downloaded the video and flights Metadata and then I followed the procedure in ArcGIS Pro. As you can see the camera is straight forward to the ground, not 90 degrees but it is looking towards the ground. But when I choose FMV the area that covered the frame is completely wrong. The frame covers a huge area which is far away. Any idea what is going wrong?

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Cody Benkelman · Answer

Flavio

sorry I couldn't respond sooner.  The vertical values from most drones can have large errors - up to 100 meters.   the RTK corrections are applied to the single images, but unfortunately the DJI API does not allow us to access the RTK corrections in realtime, so the GVLog files do not include corrected values.

We have a draft tech support article written that describes how to apply a correction to the GVLog file using MS Excel.  I can send you a copy of that draft article if you need it.  We hope to publish the article soon.

Cody B.

FlavioFurukawa · Answer

Hello! I had the same problem

In my case, I am using SiteScan LE with a Phantom 4 RTK.

The first photo the drone takes before takeoff shows an altitude of around 178 meters, but on the Geospatial Video Logs file, the "SensorEllipsoidHeight" shows 48.7 meters

The area altitude according to another RTK device shows that the altitude of the place is around 180m

I flew the drone at 30 m

thank you

VassilisTrigkas1974 · Answer

Hi and thank you for your reply,

I don't remember the height of the flight, but it's not more than 50-60 meters.

I didn't use any file for elevation.

Do you think that is the problem?