Mapping mission missed planned “distance” photos

Paul Brennan
First mission attempt and results were good except for a hole in the middle of my map, that is obviously due to improperly spaced/ missing photos. I setup a mapping mission with distance photo option. The were a couple legs where the camera did not shoot at the planned point and drone continued without taking a shot. I am using the DJI Mini 2. I suspect it was a drone distance/controller connection/communication issue as it was a rather long range mission which had trees potentially interfering with signal. My understanding is the Mini 2 does not pre-store the autopilot commands like some of the other drones. Assuming it’s a connection issue would the timed photo option still run in that situation where there is maybe temporarily a bad controller connection? Besides connection issue is there any other reason for missed photos in a “distance” photo setting mapping mission?
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3 comments

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  • Comment author
    George K

    You will probably get asked to share your mission so they can review it to help. I’m not positive, but how fast were you flying, and what overlap were you using? I could see a case where the drone is tying to take to many photos to process. Along the same lines, are you shooting just .jpg, or .jpg plus RAW? That may definitely mess things up since it can’t write the data fast enough then starts skipping things. 

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  • Comment author
    Paul Brennan

    Thanks George, good call on the JPEG/Raw it wasn’t really my intent but it was the default when I launched the mission, and I just went with it. That may be a cause.

    I’ve since edited the mission to try to work out the issues so not sure I can share it as it was.

    I was using mostly default settings with 70% overlap.

    350 foot altitude

    I believe I had speed set at 10mph.

    ….It was also a densely wooded area so I’ve bumped the overlap up to 85% for the reshoot as I’ve read that 70% may not be enough to get good results for wooded areas.

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  • Comment author
    George K
    • Edited

    I fly Mini 2 also and often go up to 80-83, maybe 70 on side lap, but never over 8 mph to try and keep motion blur down. It should work for you, I’ve done quite a few acres, maybe up to 2,000 feet away and haven’t had any issues yet….. knock on wood!

    I’ve heard that on trees, in a month when the leaves are out I’m going to have to map some to see about that. I do mostly fields with some trees. Have WebODM running some right now.

    Good luck!

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