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Are image timestamps GPS time?
1225 4 2016-10-8
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steve.dawson
lvl.2
Flight distance : 2652080 ft
New Zealand
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Hi folks, this seems like such a simple question, but maybe it's not.
I need to know the precise time at which pictures are taken. The image metadata gives time to the second. Obviously there's a clock somewhere. Is that clock synced to the GPS on the Inspire, in the controller, or on the tablet running DJI "Go"? What happens when you fly inside, when there's no GPS signal?

Thanks,

steve


2016-10-8
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DJI Natalia
Super Moderator
Flight distance : 318 ft

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Hello Steve, it's synced with the mobile device running DJI GO APP.
2016-10-9
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steve.dawson
lvl.2
Flight distance : 2652080 ft
New Zealand
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DJI Natalia Posted at 2016-10-9 18:50
Hello Steve, it's synced with the mobile device running DJI GO APP.

Hi Natalia,

I use my Inspire 1 for photogrammetry so the accuracy of the image timestamps is very important. If the timestamps are taken from the device running the "GO" app, this is not good. It's especially not good if you use an iPad Air 2 (as I do). On the wifi-only Air2, the time drifts between synchronisations (which apparently happens when you are a network, and open Safari, or similar). So, in the wilderness, the accuracy of the timestamps will drift.

Since the Inspire has it's own GPS, I'd assumed the image timestamps would be based on GPS time. It would be way better if they were. Could you please pass this on...

Thanks, Steve
2016-10-16
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DJI Natalia
Super Moderator
Flight distance : 318 ft

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steve.dawson@ot Posted at 2016-10-17 09:08
Hi Natalia,

I use my Inspire 1 for photogrammetry so the accuracy of the image timestamps is very ...

Thank you so much for the details and feedback, will help you transfer this to our relevant department.
2016-10-16
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dronedata
lvl.1

United States
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Hi DJI Natalia,
We had the same question.  We discovered the GPS timestamp is linked to the tablet and the local time which does not correct for positional time error.  We are looking for the GPS time to the hundredth of a second.  We are running M600 with just the A3 without RTK and currently using just the X3 but plan on using the X5 if we can get this time issue corrected to correlate the exact focal center on the ground.  
Thanks...
2017-2-8
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