I used applied rolling shuttle adjustment and the parameter calibration is improved. However, it does not resolve the DSM issue. DSM still exists.
When checking the Point Clouds, there appear to be many ‘black holes’ where the trees are not reconstructed
Those black holes are filled as ‘green ground cover’ in triangle mesh.
Plus there is no tie points over the tree rows.
I also tried All Prior in calibration with rolling shuttle adjustment. The result is similar and the image is even a bit distorted, so it is not likely to solve the problem.
The camera calibration issue actually happens a lot when images are acquired with DJI Ground Station Pro App (large error in calibration and often distorted orthomosaic images). The situation is far better when using third party mapping App such as DroneDeploy. There must be some issues with the camera setting DJO GSP.
Thank you very much.