I am processing a drone project where I have GCP’s along the Drone’s imagery.
I have aligned the images and assigned GCP’s to photos then run the Align Images again.
Settings - Use Camera Priors… NO
Prior Pose set to Unknown
Brown4 with Tangential2
I am getting a residual line on a GCP that is causing the project to curve down in elevation.
When I look at the altitude for the GCP (Actual Position) in question is is almost 10m lower than then measured GCP.
I have not had it where the GCP coordinate is not being held.
Having GCP’s has always made any “banana” effect go away.
Any suggestions?
Hi, are you running those settings before the first alignment or before the second alignment? Have you deleted the already created component before the second alignment?
Can you show some print screens from your project?
Attached are some screen shots of the settings I use.
The biggest issue in the processing is that the elevation information from the images is not being held. The drone images are being flow at multiple elevations, but there should not be much variance in the photos being taken along each pass at an elevation. I would thing that selecting Yes to Use camera priors for georeferencing would make the photos hold the elevation information.
Jeff
Such datasets (long narrow lines) aren’t ideal and such extremes can happen.
In cases like this the previous mentioned article about banana effect can help. Also, use only the georeferencing infomration from GCPs, delete the previously created components.
When you have set camera priors for georeferencing, try to set extreme (like 0) positions accuracies.
You should probably use more control points or GCPs. Also, knowing the camera calibration parameters before computation and their usage in the alignment process can help in such cases.
