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Mavic 2 Pro Altitude image tags (new info)
493 3 2018-10-19
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djiuser_6Q57jczySsAE
Second Officer
Flight distance : 623366 ft
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I took photos at 5 feet elevation intervals from 5 feet to 100 feet.

My launch elevation (orthographic height from google earth) is 245 meters above MSL, also this matches my iphone's GPS elevation.

The images, both jpeg and DNG, contain three Altitude tags.

  • AbsoluteAltitude  - this is broken, as it is always set to 1.2
  • RelativeAltitude - this appears to be *uncorrected* barometric height above MSL.
  • GPSAltitude - this appears to the RelativeAltitude value truncated to a single digit beyond the decimal place (NOTE, it's not rounded, but truncated)


Values for the photo at 5 feet AGL:
AbsoluteAltitude = 1.2 (broken)
RelativeAltitude = 130.87 meters
GPSAltitude = 130.8 meters

my iphone is saying 160 meters elevation based on its uncorrected barometric sensor, while its GPS is sayin 245 meters, so it seems clear to me that the Mavic is reporting uncorrected barometric readings for GPS and Relative altitudes.

This isn't ideal, but I can live with it. I suspect this presents more of an issue for those using Drone Deploy and/or Maps Made Easy.

My lingering concern is ensuring this is well documented for each firmware version.



2018-10-19
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djiuser_6Q57jczySsAE
Second Officer
Flight distance : 623366 ft
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Oh, a note to the DJI developers: I'm willing to test new versions of software and provide feedback on image tags related to position and altitude.

Here's more data. This the RelativeAltutude from each photo. I used the DJI Go app's height report to manually position the drone at 5 foot intervals.

RelativeAltitude
Converted to Feet
Difference in feet between images
130.87
429.3635308
132.47
434.6128748
5.25
134.07
439.8622188
5.25
135.47
444.4553948
4.59
137.17
450.0328228
5.58
138.67
454.9540828
4.92
140.17
459.8753428
4.92
141.67
464.7966028
4.92
143.37
470.3740308
5.58
144.77
474.9672068
4.59
146.17
479.5603828
4.59
147.87
485.1378108
5.58
149.47
490.3871548
5.25
150.87
494.9803308
4.59
152.47
500.2296748
5.25
153.97
505.1509348
4.92
155.37
509.7441108
4.59
156.97
514.9934548
5.25
158.47
519.9147148
4.92
159.87
524.5078908
4.59

2018-10-19
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Klaus W.
First Officer
Flight distance : 104898 ft
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Regarding how GPS data should be recorded into EXIF tags you might cf. CIPA page 71ff
2018-10-20
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DJI Tony
Super Moderator

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Thank you for your feedback. The concern will be fixed in the next firmware version, therefore, please pay close attention to the firmware update information. Thank you for understanding.

2018-10-21
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