Orthomosaic shift

[dsmapping]

We are having an issue after exporting an orthomosaic to Global Mapper and Civil 3D where the ortho is shifted in some places as much as .3'.  In Agisoft, the gcp's are dead on but in these other programs the target location and the gcp coordinates are not hitting in the same spot.  Why is this? Is there some kind of default scale when exporting out of agisoft?

[T3]

what's your residuals for you control points?
how tight are you holding your GCPs vs your images?

[dsmapping]

Probably too tight... the default accuracy was set on like .016404. I'm not sure where that came from. What did you set yours to?

[T3]

if you have a pretty good GPS/IMU on your sensor you could get away with 1'. thats what I usually set ours at, we have an applanix. I keep modifying the imagery accuacy until the RMSE for my control is within the spec your looking to map (usually .25')

[jkova96]

I have same issue with one of my project, but as you can see...I had  not only that issue...you can see also "SERIOUS BUG..." thread on this forum started by myself. There's no any feedback. Cause they maybe have lack of time, but I hope they'll come back. I have feeling that support have free friday time, but I want someone will solve these issue(s) in time. Thanks. Bye and good luck

[dsmapping]

Still having the same issue. Has anyone else had this? Everything is dead nuts in Agisoft, but anything we export to we are seeing a shift in the points away from the GCPS- sometimes as much as a few inches. Why is this? Does the export out of Agisoft apply some type of scale factor?

[dsmapping]

Hoping that someone from Agiosft sees this.  When we export an orthomosaic we are experiencing a shift of sorts compared to the control points. Inside Agisoft the control points land right on top of our black and white targets. Our residuals are acceptable .15' control and .098' to our checkpoints.  But for some reason after we export the orthomosaic and import it into Autocad Civil 3D or Global Mapper, there is a shift sometimes up to a few 3 or 4 inches.  Is there a some kind of scale factor that Agisoft is applying to our exports? Why would there be a shift outside of Agisoft?  It is pretty frustrating and I hope that we can get this resolved. Help!

[olihar]

please provide more info, what EPSG are you using and screenshots are always helpful.

[Alexey Pasumansky]

Hello dsmapping,

If you create new markers without any projections on the aligned cameras that have the same coordinates as the control points - do they fit the target centers on the orthomosaic in Metashape project (providing that those markers are checked on in the Reference pane)?