Stereo Calibration for large baseline

I want to detect and estimate depth of objects which are hundreds of meters from the cameras. The cameras are set on wider baseline to cover most of the area. The baseline distance is terms of tens of meters.

What would be the best way to calibrate the cameras. Calibration using a checker board or any such pattern won’t be feasible as cameras could be zoomed in.

Assumption is that both the cameras are same.


Any help would be greatly …

board cameras computervision objects set terms