Hi Mike,
You will get much better results with a mechanical shutter. For the DJI, try the X4s – very nice camera (and less expensive than the X5s).
I am surprised at the very large vertical error. We are typically seeing an RMSE of about 5 cm vertical and seldom ever more than 10 cm Peak to Peak (bare earth such as mining but even with very large vertical elevation ranges such as deep pits).
We have also found a lot of the DJI mission control apps to be less than desirable. We finally settled on DJI Ground Station Pro. It works quite well.
Mike Tully
Good tips. Thanks, Lewis. I share your low confidence using rolling shutter cameras after seeing these results. Your observation about large vertical error is interesting. Our results may be higher because the photogrammetrically-derived DEMs we tested were not edited. The only bare-earth DEMs we tested were from the Riegl VUX on the Vapor 55 and the Leica ALS70 in the manned aircraft.
Mike Tully
Thanks, Lewis. I share your low confidence using rolling shutter cameras after seeing these results and others. Your observation about large vertical error is interesting. Our results may be higher because the photogrammetrically-derived DEMs we tested were not edited. The only bare-earth DEMs we tested were from the Riegl VUX on the Vapor 55 and the Leica ALS70 in the manned aircraft.
Brian Forrester
Hi Mike,
Figure 8: I am not seeing the difference between Full Control and Some Control….different scale, but basically same result?
Brian
Mike Tully
My apologies. Figure 8b was a misprint. It has been updated to reflect the correct results.
Hi Mike,
You will get much better results with a mechanical shutter. For the DJI, try the X4s – very nice camera (and less expensive than the X5s).
I am surprised at the very large vertical error. We are typically seeing an RMSE of about 5 cm vertical and seldom ever more than 10 cm Peak to Peak (bare earth such as mining but even with very large vertical elevation ranges such as deep pits).
We have also found a lot of the DJI mission control apps to be less than desirable. We finally settled on DJI Ground Station Pro. It works quite well.
Good tips. Thanks, Lewis. I share your low confidence using rolling shutter cameras after seeing these results. Your observation about large vertical error is interesting. Our results may be higher because the photogrammetrically-derived DEMs we tested were not edited. The only bare-earth DEMs we tested were from the Riegl VUX on the Vapor 55 and the Leica ALS70 in the manned aircraft.
Thanks, Lewis. I share your low confidence using rolling shutter cameras after seeing these results and others. Your observation about large vertical error is interesting. Our results may be higher because the photogrammetrically-derived DEMs we tested were not edited. The only bare-earth DEMs we tested were from the Riegl VUX on the Vapor 55 and the Leica ALS70 in the manned aircraft.
Hi Mike,
Figure 8: I am not seeing the difference between Full Control and Some Control….different scale, but basically same result?
Brian
My apologies. Figure 8b was a misprint. It has been updated to reflect the correct results.
Thank You Mike!
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