Not sure how long has Photoscan has the ability to import a DEM to improve geometry accuracy, but while reviewing the 1.4 manual, I discovered it this option and I am very excited to explore its utility.
Yet, apart from mentioning the capability in a few words on page IV, I did not find further information in chapter 4, Referencing and Camera Calibration. Nevertheless, I did try to import an old lidar DEM .tif file, and aligned the pictures, but off the bat it does not seem the reference DEM was accounted for when inspecting the sparse point cloud. What am I missing?
It would be nice to know the limitations, of importing a reference DEM to the final model. For example, if a reference DEM has much coarser resolution, and not necessarily includes all the features capture from SfM.
Thanks