I have discovered an issue but would like to get confirmation in some way so that I can adjust what I do in future flights.
I recently flew a small building and completed 3 sides but had to land to change batteries. When I took off to complete the 4th side I moved to a new location roughly 20m from my first take off point.
When I processed my images the images from the second flight were mis-aligined making the entire side of the model damaged. I have manually re-aligned now but am I correct in thinking that two separate take off points have caused this?
Hi Paul,
this could be related to the changed GPS (as you turned off the drone, the setup changed slightly, as the drone’s GPS is not so precise and the satellites changed their positions during capturing).
You can try to turn off the camera priors for the second flight’s images and provide the alignment.
Well, that made a HUGE difference! I couldn’t work out how to de-select just the second flight images at first so I ran a new project with camera priors turned off so all images didn’t use GPS and the results were much better.
The only issue I had (but can live with) is that I had placed several GCPs and measured two points to a 2m separation but RC calculates the distance as 3m.
Thanks for the assist - very happy with the results.
In this case I changed the camera priors setting in a new project, added all my images and ran an alignmnent. Which was pretty good.
I then located the two GCPs and added 2 control points and set the measurement to 2m.
After a dozen or so more photos were aligned to the same 2 control points I got the error or warning message and I was seeing the distance value as 3m.
Changed to what setting? Position or Unknown?
Can you show me the print screen of 1ds view with your results?
Have you provided also second alignment after placing CPs over the images?
In Application Settings I set Ignore GPS Exif to YES,
1DS view attached.
For reference the Point 0 to Point 1 measurement in the real world is 2.0m.
The Point 5 to Point 6 is the base of a plastic cone and measures 17cm.
I set the distance measurement and then ran an alignment, no further alignments have been taken…but I am going to do another one now as I just added the point 5 to point 6 measurement…and I just realised there is an UPDATE option in the alignment section which I had not used before, so I just clicked and BOTH measurements no display the correct value.
