I am in the process of building a 3D model of a city, using a set o aerial images. The images are acquired by an airplane, using a camera rig with 5 cameras: one looking down (nadir) and four looking obliquely (N,S,W and E) with a tilting angle of -45 degrees.
By reading the documentation, I found that in order to improve the speed of the camera alignment process, it is helpful to use the "Reference Preselection" setting, so that the algorithm knows which cameras are more likely to have matching points. Furthermore, it is recommended, in case of oblique images, to set the average altitude of the cameras in the "Capture distance" option of the reference settings.
My question is: is it necessary to set this "capture distance" option, in the case when the images altitude is already present in the reference panel? Is the images altitude already taken into account during the alignment process, or do I have to set the average altitude anyway? My fear is that the image-wise altitude is more precise than an average, so by overriding it with an average one I'm afraid to lose some accuracy.
Thank you
Andrea