For example, ZED-X stereo cameras have +inf, -inf, and NaN in their depth image values to indicate too far, too close, and no information respectively.

Differentiating between "too far" and "no information" is pretty important to map out empty areas. Too far means the space up to the sensing range is empty while "no information" simply does not convey anything.

Thank you !

Hello, I have the Starling Max with the C29 cameras.

I am able to find intrinsic calibration files for the tracking cameras.

:~$ voxl-check-calibration
Calibration File Status:
Present /data/modalai/voxl-imu-server.cal 
Present /data/modalai/opencv_tracking_front_intrinsics.yml 
Present /data/modalai/opencv_tracking_down_intrinsics.yml 
Present /data/px4/param/parameters_gyro.cal 
Present /data/px4/param/parameters_acc.cal 
Present /data/px4/param/parameters_level.cal 
Present /data/px4/param/parameters_baro_tc.cal 
Present /data/px4/param/parameters_mag.cal 

I am trying to get the ToF and Hires camera calibration.

Since ToF also publishes a point cloud, the intrinsics must be there already somewhere for ToF at least ?